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GoHealthcare MSK Specialty Procedure Library™ | Ambulatory Surgery Center Operations

Ambulatory Surgery Center Prior Authorization

Coverage, Medical Necessity, Utilization Management, and Authorization Workflow for the ASC Setting

An ASC-focused authorization resource covering procedure and facility review, site-of-service medical necessity, Medicare and commercial payer pathways, delegated utilization management, implant authorization, denial prevention, and appeals.

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Publication and Use Information. This page is an educational and operational reference. It is not medical, legal, compliance, coding, or reimbursement advice and does not replace independent clinical judgment or verification of the payer, regulatory, coding, and payment requirements in effect for the specific patient and date of service. Authorization does not guarantee coverage or payment.

Up to 98%prior authorization approval rate reported in supported workflows

Operational performance depends on disciplined documentation and payer alignment.

GoHealthcare supports specialty practices and ASCs with prior authorization, utilization management, patient access, coding, revenue-cycle operations, compliance, and workflow optimization.

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Company-reported results vary by payer, patient population, clinical documentation, case mix, workflow design, and client execution.

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Use the links below to move directly to each section.

Guide Sections 1-8

1. Overview
2. Evidence at a Glance
3. Regulatory and Structural Foundation of the ASC Setting
4. Clinical Indications for ASC Site of Service
5. Patient Selection
6. Contraindications and Coverage Exclusions
7. Conservative Treatment and Clinical Prerequisite Requirements
8. Documentation Requirements

Guide Sections 9-16

9. Imaging Requirements
10. Medical Necessity
11. Medicare Coverage and the Three Concurrent Prior Authorization Regimes
12. Commercial Payer and Utilization Management Vendor Comparison
13. Prior Authorization Workflow
14. Common Prior Authorization Denials and Adverse Determinations
15. Appeal Strategies and Peer-to-Peer Considerations
16. Coding and Billing Overview

Guide Sections 17-24

17. Applicable CPT® Code Considerations
18. HCPCS Level II Code Considerations
19. Common ICD-10-CM Diagnosis Code Considerations
20. Applicable Modifiers and Place of Service
21. Clinical Documentation Checklist
22. Setting Comparison: ASC, Hospital Outpatient Department, and Office
23. GoHealthcare Clinical Insights
24. GoHealthcare Leadership Perspective

Guide Sections 25-32

25. GoHealthcare Case Study
26. GoHealthcare Best Practices
27. Common Mistakes
28. Pearls and Pitfalls
29. Frequently Asked Questions
30. Key Takeaways
31. Future Outlook
32. References

Guide Sections 33-38

33. Reading Recommendations
34. Related GoHealthcare Resources
35. Recommended Downloads
36. Visual Recommendations
37. Educational Disclaimer

01

Overview

Prior authorization in the ambulatory surgery center setting is structurally different from prior authorization in a physician office or a hospital outpatient department, and the difference is the single most underappreciated source of preventable denials in ASC revenue cycle operations. An ASC case generates at least three separate financial events from one clinical encounter: a facility claim from the ASC, a professional claim from the operating physician, and an anesthesia claim from the anesthesia provider. Implants, biologics, radiology, and pathology may generate additional claims. Each of these can be governed by different authorization rules, different review vendors, and different benefit categories - and in a growing number of programs, the failure of the facility authorization causes the professional and anesthesia claims to fail with it.

This guide addresses the operational discipline required to obtain, document, and defend authorization for care delivered in the ASC setting. It covers the three distinct Medicare prior authorization regimes now operating simultaneously in 2026 - the nationwide hospital outpatient department program, the new ASC-specific demonstration, and the WISeR Model - and explains precisely which applies to an ASC and which does not. It then addresses commercial payer site-of-service review, the utilization management vendors that govern musculoskeletal authorization, the facility-versus-professional authorization problem, implant and device authorization, and the denial and appeal patterns that follow.

The 2026 policy environment makes this material unusually consequential. In the CY 2026 Hospital Outpatient Prospective Payment System and Ambulatory Surgical Center Payment System Final Rule (CMS-1834-FC), the Centers for Medicare & Medicaid Services finalized the elimination of the Inpatient Only list over a three-year transition and simultaneously added 560 surgical procedures to the ASC Covered Procedures List. Cases that were structurally unavailable to the ASC setting for decades are becoming available. The authorization infrastructure of most surgery centers was not built for that acuity, and the operational gap between what an ASC may now perform and what an ASC can reliably get authorized and paid for is widening.

This guide is written for that gap. It is not a procedural technique manual and does not provide surgical instruction, needle placement guidance, or medication dosing. It is an operational reference on coverage, medical necessity documentation, authorization workflow, denial prevention, and appeal strategy for ambulatory surgery centers and the musculoskeletal specialty practices that use them.

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02

Evidence at a Glance

The table below is the executive summary of the authorization landscape governing the ASC setting as of the publication date of this guide. Each row is developed in detail in the sections that follow.

Domain	Current position (2026)
Medicare NCD	No National Coverage Determination governs prior authorization for ASC facility services generally. Coverage of the underlying procedure is governed by the applicable NCD, LCD, or Local Coverage Article for that procedure, independent of setting.
Medicare LCD / LCA	LCDs and LCAs are procedure-specific and MAC-specific. They apply to the ASC setting identically to other settings. The ASC does not receive a separate or relaxed medical necessity standard.
Medicare FFS prior authorization - OPD program	Nationwide program under 42 CFR 419.83 covering eight service categories, including cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions. Applies to hospital outpatient departments only. Does not apply to ASCs.

Domain	Current position (2026)
Medicare FFS prior authorization - ASC demonstration	Five-year demonstration in ten states covering five service categories (blepharoplasty, botulinum toxin injections, panniculectomy, rhinoplasty, vein ablation). Phase 1 dates of service on or after January 19, 2026; Phase 2 on or after February 16, 2026. The three musculoskeletal OPD categories are expressly excluded from this demonstration.
Medicare FFS prior authorization - WISeR Model	Six-state CMS Innovation Center model, 2026 through 2031, applying prior authorization or prepayment review to selected Part B services including epidural steroid injections (excluding facet joint injections), electrical nerve stimulator implants, percutaneous vertebral augmentation, cervical fusion, and percutaneous image-guided lumbar decompression.
Medicare Advantage	Prior authorization is plan-specific and near-universal for surgical services. MA plans must apply Traditional Medicare coverage criteria where they exist. CMS-0057-F operational timeframes apply: 72 hours expedited, seven calendar days standard.
Commercial payer coverage	Authorization is generally required for the facility component, the professional component, or both. Site-of-service medical necessity review is now standard practice and is typically triggered when the hospital outpatient department is requested rather than the ASC.
Utilization management vendors	eviCore, Carelon Medical Benefits Management, Cohere Health, Evolent, and TurningPoint administer musculoskeletal and spine authorization for large segments of commercial and Medicare Advantage membership. Vendor assignment varies by plan, product line, and state.
Conservative therapy documentation	Required by nearly every commercial and vendor MSK policy. Duration, modality, dates, and documented failure or intolerance must be specific. Generic statements of failed conservative care are the most common single cause of non-affirmation.
Imaging requirements	Advanced imaging correlating with the clinical presentation is required for most spine and joint procedures. Imaging must be recent enough to satisfy the applicable policy and must be interpreted in the clinical note, not merely referenced.
Facility versus professional authorization	Separate authorizations are frequently required. Many denials arise because the professional authorization was obtained and the facility authorization was not, or because the authorized site of service does not match the site billed.
Typical approval considerations	Correct benefit category, correct site of service on the request, matching CPT® codes between authorization and claim, documented conservative care with dates, correlating imaging, a physician medical necessity statement, and a valid authorization number reported on the correct claim in the correct field.

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03

Regulatory and Structural Foundation of the ASC Setting

Authorization outcomes in the ASC setting cannot be understood without the regulatory definition of the setting itself. Several recurring denial patterns are direct consequences of the federal definition of an ambulatory surgery center, and teams that do not understand the definition tend to misdiagnose those denials as clerical errors.

Federal definition and the 24-hour boundary

Under 42 CFR 416.2, an ambulatory surgical center is a distinct entity operating exclusively to provide surgical services to patients not requiring hospitalization, in which the expected duration of services would not exceed 24 hours following an admission. The entity must have an agreement with CMS to participate in Medicare as an ASC and must meet the Conditions for Coverage at 42 CFR Part 416, subparts B and C.

The operative word is expected. The standard is applied prospectively at the point of case selection, not retrospectively at the point of discharge. A case that was reasonably expected to conclude within the window does not become non-compliant because an unanticipated complication extended recovery. A case that was never realistically expected to conclude within the window does not become compliant because the patient happened to recover quickly. This distinction is the foundation of defensible ASC case selection documentation, and it is addressed in detail in the companion guide

on observation versus outpatient status.

Covered surgical procedure criteria

Covered surgical procedure criteria are governed by 42 CFR 416.166, which was restructured effective January 1, 2026. Under the current 42 CFR 416.166(b)(2), a covered surgical procedure is one that is separately paid under the OPPS and is not designated as requiring inpatient care under 42 CFR 419.22(n), not reportable only with a CPT® unlisted surgical procedure code, and not otherwise excluded under 42 CFR 411.15.

A citation to retire from your policy documents

42 CFR 416.65 is frequently cited for the proposition that covered surgical procedures generally require a post-operative recovery room or short-term, non-overnight convalescent room. That section applies, by its own terms, only to services furnished before January 1, 2008. It is not current authority, and it should be removed from policy documents addressing services furnished today. The citation propagates widely through consultant materials and facility policy manuals.

Related, the general standard formerly at 42 CFR 416.166(b)(1) - requiring that standard medical practice dictates the beneficiary would not typically be expected to require active medical monitoring and care at midnight following the procedure - ceased to operate as a coverage criterion on January 1, 2026. It now appears at 42 CFR 416.166(d) as a physician consideration for the individual beneficiary.

CMS survey and certification guidance (S&C-04-22) has stated that the regulations do not allow planned overnight recoveries in an ASC for approved procedures performed on Medicare beneficiaries. That guidance predates the 2026 amendments. This guide does not assert that the position has changed or that it has not; facilities should confirm the current position with their Medicare Administrative Contractor and retain the response. Guide B04-06 addresses this in full.

What has not changed is the length-of-stay standard itself. 42 CFR 416.2 is unamended, and the Conditions for Coverage at 42 CFR 416.44(a)(2) continue to require a distinct recovery room and a distinct waiting area, clarified in S&C-02-16.

Two operational consequences follow. First, an ASC cannot solve an acuity problem by planning an overnight stay for a Medicare beneficiary; the expected duration standard governs regardless of which procedures appear on the Covered Procedures List. Second, state law frequently diverges from the federal standard, and several states have enacted statutory language addressing extended recovery windows. Where state law is more permissive than the federal standard, the federal standard still governs the Medicare beneficiary. Multi-state ASC organizations must maintain state-specific case selection policies rather than a single national policy.

What changed in CY 2026

CY 2026 policy change	Operational consequence for authorization
CMS finalized elimination of the Inpatient Only list over a three-year transition, removing 285 predominantly musculoskeletal procedures for CY 2026.	Procedures previously unavailable in any outpatient setting are now outpatient-eligible. Payer policy, vendor criteria, and internal case selection policy all lag the regulation, creating a window in which a procedure is federally permissible but not yet reliably authorizable.
CMS revised the ASC Covered Procedures List criteria, eliminating five general exclusion criteria and recasting them as nonbinding physician considerations for patient safety.	Case selection judgment shifts to the physician. The regulatory guardrail is replaced by a documentation obligation. Facilities should expect payers and surveyors to look for evidence that the physician actually exercised that judgment for the individual patient.
CMS added 289 procedures to the ASC CPL under the revised criteria and a further 271 codes removed from the IPO list, for 560 total surgical additions, plus ancillary service additions.	Charge master, contract, authorization matrix, and implant cost modeling must all be refreshed. A newly CPL-eligible code with no commercial contract rate and no authorization pathway is a scheduled case that will not be paid.

CY 2026 policy change	Operational consequence for authorization
ASC payment rates updated by 2.6 percent, based on a 3.3 percent hospital market basket increase reduced by a 0.7 percentage point productivity adjustment.	CY 2026 ASC conversion factor of $56.322 for centers meeting quality reporting requirements and $55.224 for centers that do not. The differential compounds across volume.
ASCs failing Ambulatory Surgical Center Quality Reporting Program requirements remain subject to a 2.0 percentage point payment reduction.	Quality reporting compliance is a revenue cycle issue, not solely a quality department issue. It should be tracked on the same operational dashboard as authorization performance.
The two-midnight medical review exemption continues for procedures removed from the IPO list on or after January 1, 2021.	Relevant primarily to the hospital partner in a joint venture, but material to any organization steering cases between an ASC and an affiliated hospital outpatient department.

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04

Clinical Indications for ASC Site of Service

Prior authorization for an ASC case has two independent clinical questions embedded in it, and payers evaluate them separately. The first is whether the procedure is medically necessary at all. The second is whether the ASC is an appropriate and medically necessary site for that procedure in this patient. A request can satisfy the first and fail the second, or the reverse. Authorization teams that submit only procedure justification and omit site justification produce avoidable non-affirmations.

Procedure-level indication

The procedure-level indication is governed by the applicable coverage policy for that specific procedure - the NCD, the MAC LCD and associated Local Coverage Article, the commercial medical policy, or the utilization management vendor criteria set. Nothing about the ASC setting relaxes these requirements. The most common error in ASC authorization is the assumption that a lower-cost site of service produces a lower evidentiary burden. It does not.

Site-level indication

Site-level appropriateness is assessed against patient factors that predict the need for hospital-level resources. Payer site-of-service policies and ASC case selection policies generally converge on similar factors, although the direction of the inquiry differs: the ASC asks whether the patient is safe here, while the payer asks whether the patient genuinely requires a more expensive setting.

Factor category	Elements that commonly support hospital-based care	Documentation implication
Cardiopulmonary status	Unstable or recently decompensated cardiac disease, significant valvular disease, recent myocardial infarction or coronary intervention, poorly controlled arrhythmia, severe pulmonary disease, home oxygen dependence, pulmonary hypertension.	Specify the diagnosis, the current functional status, the treating specialist, and the date of the most recent cardiology or pulmonary evaluation.
Airway and anesthesia risk	Documented difficult airway, elevated ASA physical status classification, prior adverse anesthetic event, malignant hyperthermia susceptibility, moderate to severe obstructive sleep apnea with poor adherence to therapy.	An anesthesia preoperative evaluation stating the specific risk and the resource it requires carries substantially more weight than a physician assertion of high risk.
Metabolic and hematologic	Poorly controlled diabetes, end-stage renal disease requiring dialysis, significant hepatic impairment, anticoagulation that cannot be safely interrupted, bleeding disorder, high transfusion probability.	Include the objective values and dates that support the characterization rather than the adjective alone.

Factor category	Elements that commonly support hospital-based care	Documentation implication
Body habitus	Body mass index exceeding the facility's credentialed threshold or the equipment weight limit, in combination with comorbidity.	Cite the facility's documented policy threshold. Body habitus alone is a weaker argument than body habitus combined with a specific anesthesia or equipment limitation.
Procedure complexity and duration	Anticipated operative duration, anticipated blood loss, staged or bilateral procedures, anticipated need for intraoperative imaging or specialty equipment not available at the ASC.	Quantify. Anticipated duration and estimated blood loss are more persuasive than a general description of complexity.
Post-procedure care requirements	Anticipated need for continuous monitoring beyond the recovery period, intravenous therapy, or a level of nursing care exceeding ASC capability.	This factor is dispositive under the 24-hour standard and should be documented at case selection, not at discharge.
Social and support factors	Absence of a responsible adult escort, unsafe discharge environment, geographic distance from emergency services.	Increasingly scrutinized by payers as insufficient on its own. Pair with a clinical factor wherever possible.

GoHealthcare Clinical Insight: the direction of the argument

Site-of-service argumentation runs in opposite directions depending on which setting is being requested, and teams that use a single template for both fail routinely.

• When requesting the ASC, the argument is that the patient is medically appropriate for a freestanding setting: stable comorbidities, acceptable anesthesia risk, reasonable expected duration, and a safe discharge plan.
• When requesting the hospital outpatient department for a procedure the payer expects in an ASC, the argument is the reverse: a specific, documented clinical factor requiring hospital-level resources.

Submitting hospital-justification language on an ASC request is a self-inflicted denial. It tells the reviewer the patient is too complex for the site being requested. We see this monthly in charts we audit.

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05

Patient Selection

Patient selection is where clinical governance and revenue cycle integrity meet. A facility with a written, applied, and auditable case selection policy will authorize more successfully, defend site-of-service challenges more effectively, and survey more cleanly than a facility that relies on individual surgeon judgment alone. With the CY 2026 removal of five ASC CPL general exclusion criteria and their recasting as nonbinding physician safety considerations, the documented exercise of that judgment becomes the record.

Elements of a defensible case selection policy

• A written policy approved by the governing body and the medical staff, reviewed at least annually and after any material change to the ASC Covered Procedures List.
• Explicit thresholds where the facility has them - ASA physical status classification limits, body mass index limits, age limits, anticoagulation management parameters, and equipment weight capacities - stated as facility policy rather than clinical dogma.
• A defined preoperative screening pathway specifying who screens, when, against what criteria, and what triggers escalation to anesthesia review.
• A documented anesthesia review pathway with authority to redirect a case to a hospital setting.

• An exception pathway permitting a documented, individualized deviation with stated rationale, rather than silent variance from policy.
• A transfer agreement and documented transfer pathway, with the transfer rate tracked and reviewed as a quality indicator.

• Retrospective review of transfers, unplanned admissions, and prolonged recoveries, feeding back into the selection criteria.

Screening timing and its authorization consequence

Preoperative screening that occurs after authorization has been obtained creates a predictable failure. If screening identifies a factor requiring a hospital setting, the ASC authorization becomes unusable, the case must be rescheduled, and a new authorization must be obtained for a different facility and frequently a different tax identification number. In high-performing organizations, clinical screening precedes or runs concurrently with the authorization request, so that the site of service submitted is the site of service actually intended.

The reverse sequencing failure is equally common and more expensive: a case screened as hospital-appropriate, authorized for the hospital outpatient department, and then moved to the ASC for scheduling convenience. The authorization on file no longer matches the site billed, and the facility claim denies.

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06

Contraindications and Coverage Exclusions

Two distinct categories are frequently conflated in ASC operations: clinical contraindications to the ASC setting, and coverage exclusions that make a service non-payable in an ASC regardless of clinical appropriateness. Both cause scheduled cases to fail, but they fail at different points and require different controls.

Clinical contraindications to the ASC setting

• Anticipated need for care exceeding the 24-hour expected duration standard at 42 CFR 416.2.
• Anticipated postoperative requirements that exceed the facility's staffing, monitoring, or equipment capability.
• Anesthesia risk assessed by the anesthesia provider as requiring hospital-level resources.
• Comorbidity that is active, unstable, or recently decompensated rather than chronic and controlled.
• Absence of an appropriate discharge plan or responsible escort where the anesthetic plan requires one.
• Anticipated blood loss, transfusion probability, or intraoperative imaging requirements exceeding facility capability.

Coverage and payment exclusions

Exclusion type	Effect	Control point
Procedure not on the Medicare ASC Covered Procedures List	No Medicare facility payment in the ASC. Addendum EE of the ASC addenda identifies surgical procedures excluded from Medicare payment in ASCs.	Scheduling edit checking the current CPL and the annual addenda before the case is booked.
Procedure remaining on the Inpatient Only list during the transition	Not payable in the ASC. CMS has maintained that IPO-designated procedures are not added to the ASC CPL while designated, with the exclusion falling away once the procedure is removed from the IPO list.	Annual reconciliation of the IPO transition schedule against the case mix as the three-year phase-out proceeds.
Statutory exclusion - cosmetic services	Not covered by Medicare irrespective of setting. Relevant to the ASC prior authorization demonstration categories.	Preoperative determination of functional versus cosmetic indication, with the ABN pathway and GX modifier applied where appropriate.
Service packaged into the facility payment	Separate line-item billing is inappropriate. ASCs must not report separate charges for services, drugs, devices, or supplies packaged into the covered surgical procedure allowance.	Charge master governance and periodic packaging audit.

Exclusion type	Effect	Control point
Out-of-network facility status	Authorization of medical necessity does not create network status or a payment obligation at in-network rates, and may trigger federal or state balance billing protections.	Network verification as a distinct step from benefit verification, performed for the facility tax identification number specifically.
Benefit-level exclusion or exhausted benefit	Denial notwithstanding an approved authorization. Authorization is not a guarantee of payment.	Eligibility and benefit verification within a defined window of the date of service, re-verified for cases rescheduled beyond that window.

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07

Conservative Treatment and Clinical Prerequisite Requirements

Conservative treatment documentation is the highest-yield controllable variable in musculoskeletal authorization. Across every major commercial policy and utilization management vendor criteria set, failure of appropriate conservative care is a threshold requirement for most elective spine and joint procedures, and inadequate documentation of that failure is the most frequently cited reason for adverse determination.

What payers actually require

Payer criteria are generally specific about four dimensions, and documentation that omits any of the four is vulnerable regardless of how much narrative accompanies it.

Dimension	Requirement	Common documentation failure
Modality	The specific interventions attempted - supervised physical therapy, home exercise program, pharmacologic therapy by class, activity modification, bracing, injection therapy where applicable.	The phrase 'failed conservative treatment' with no enumeration of what was attempted.
Duration	A defined period, commonly six weeks to six months depending on the procedure and the policy, with start and end dates.	Duration stated in relative terms such as 'several months' rather than with dates.
Adequacy	Evidence the trial was genuine - number of physical therapy visits attended, adherence to a home program, medication trialed at therapeutic dose for adequate duration.	Physical therapy referred but attendance never confirmed; medication listed but never documented as trialed and failed.
Outcome	The clinical result: persistent pain scores, persistent functional limitation, and where the policy requires it, a validated functional instrument score.	Absence of any objective functional measure, leaving the reviewer with subjective report only.
Contraindication or intolerance	Where conservative care was not attempted, an explicit clinical reason: contraindication, documented intolerance, or a presentation such as progressive neurologic deficit that makes delay inappropriate.	Silent omission of the conservative care requirement rather than an affirmative statement of why it does not apply.

Functional measurement

Validated functional instruments materially strengthen a request and are explicitly referenced in several payer and vendor criteria sets. Commonly used instruments include the Oswestry Disability Index for lumbar conditions, the Neck Disability Index for cervical conditions, and joint-specific instruments for extremity procedures. The operational recommendation is to capture the instrument at the initial evaluation and again after the conservative trial, so that the record demonstrates a trajectory rather than a single point.

GoHealthcare Prior Authorization Insight: build the conservative care record forward

The most common structural error we encounter is treating conservative care documentation as a task performed at the time of the authorization request. By then the record is already whatever it is, and the authorization specialist is reduced to searching for evidence that may not exist.

High-performing practices invert this. At the point of the initial evaluation, the physician or advanced practice provider records the conservative care plan with dates and the baseline functional score, in a structured field. At each follow-up, adherence and response are recorded against that plan. By the time surgery is contemplated, the authorization packet assembles itself from discrete data rather than being reconstructed from narrative.

The measurable effect is a reduction in first-pass adverse determinations and, more importantly, a reduction in peer-to-peer reviews - because the reviewer no longer needs to call the physician to establish facts that should have been in the chart.

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08

Documentation Requirements

ASC authorization documentation spans two record sets that are often maintained by different organizations: the practice record, which establishes medical necessity for the procedure, and the facility record, which establishes appropriateness of the setting and supports the facility claim. Where the ASC and the practice are separate legal entities, the handoff between these record sets is a structural weak point.

Practice-side documentation supporting medical necessity

• History of present illness with symptom onset date, duration, character, and progression
• Pain assessment with a numeric or validated scale, at rest and with activity
• Functional impairment described in specific activity terms, with a validated instrument score where the applicable policy requires one
• Conservative treatment history with modalities, dates, duration, adherence, and documented outcome
• Medication history including class, dose, duration, response, and any intolerance or contraindication
• Focused physical examination with the findings the applicable policy requires, including provocative maneuvers and neurologic examination where relevant
• Imaging findings interpreted by the treating physician and explicitly correlated to the clinical presentation and the intended level or site
• Prior procedures at the same or adjacent site, with dates and documented response and duration of relief
• Relevant comorbidity, anticoagulation status, and prior anesthetic history
• An explicit physician medical necessity statement identifying the procedure, the anatomic site and laterality, the indication, and the clinical reasoning
• Documented informed consent discussion including alternatives considered

Facility-side documentation supporting site of service

• Preoperative screening or history and physical within the interval required by the facility policy and applicable Conditions for Coverage
• Anesthesia preoperative evaluation with ASA physical status classification assignment and airway assessment
• Documented application of the facility case selection policy, including any exception rationale
• Verified eligibility, benefits, and network status for the facility tax identification number

• Authorization number, authorized CPT® codes, authorized units, authorized site of service, and validity dates, retained in the facility record

• Implant, device, and high-cost supply plan with anticipated codes and any separate authorization or documentation requirement
• Confirmation that the professional and anesthesia authorizations are in place where separately required
• Discharge plan including responsible escort and post-discharge contact

• Advance Beneficiary Notice of Non-coverage where a Medicare denial is expected, with the correct modifier pathway identified

Common failure: the authorization record that lives only in the practice

When the operating practice obtains authorization and the ASC never receives the authorization detail, the facility bills against an authorization it cannot see. If the authorization covered only the professional service, or covered a different site of service, or listed different CPT® codes than those ultimately performed, the facility claim denies and the facility has no documentation with which to appeal.

The control is simple and frequently absent: the facility does not confirm a case onto the schedule until it holds, in its own record, the authorization number, the authorized codes, the authorized site of service, the authorized units, and the validity dates.

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09

Imaging Requirements

Imaging is the second most common documentation failure point after conservative care. Payer and vendor criteria generally require that imaging be recent, of an appropriate modality, and correlated to the clinical presentation. Each of the three is independently deniable.

Requirement	Practical standard	Failure mode
Recency	Most policies specify a maximum interval, commonly six to twelve months, with shorter intervals where the clinical picture has changed or a prior intervention has occurred.	Reliance on a study that predates the current episode of care or predates a prior surgery at the same site.
Modality	The modality the policy specifies. Magnetic resonance imaging is generally required for neural compression; computed tomography where instrumentation, bone detail, or an MRI contraindication applies; weight-bearing or flexion-extension radiographs where instability or alignment is at issue.	Submission of plain radiographs where advanced imaging is required, or of a study that does not address the pathology asserted.
Correlation	The physician note must state how the imaging finding explains the specific clinical presentation, at the specific level or site, on the specific side.	Radiology report attached with no physician interpretation. This is the single most common imaging-related non-affirmation we encounter.
Level and laterality concordance	The imaging finding, the physical examination finding, the diagnosis code, and the requested procedure must all describe the same level and side.	Discordance between the imaging level and the requested surgical level, which reviewers identify immediately.
Completeness of submission	The full radiology report, not an excerpt. Where the payer permits, the actual images.	Submission of an impression line only, stripped of the findings that support it.

A recurring and avoidable problem is the incidental finding that undermines the request. Where imaging demonstrates multilevel degenerative change and the request addresses a single level, the physician note must affirmatively explain why that level is the pain generator. Absent that explanation, the reviewer sees diffuse degenerative disease and a single-level request with no stated basis for the selection.

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10

Medical Necessity

Medical necessity in the ASC context is a two-part determination, and payers document them separately even when they are adjudicated in a single review. Understanding the separation changes how a request should be constructed.

Part one: necessity of the procedure

This is governed by the coverage policy applicable to the procedure. For Medicare fee-for-service, that is the NCD where one exists, otherwise the MAC's LCD and associated Local Coverage Article, otherwise the reasonable-and-necessary standard applied by the contractor. For Medicare Advantage, plans must apply Traditional Medicare coverage criteria where such criteria exist, and may apply internal criteria only where Traditional Medicare criteria are absent or incomplete. For commercial coverage, the plan's medical policy or the delegated vendor's criteria set governs.

Part two: necessity of the site

Site-of-service necessity is a distinct commercial construct with no direct Medicare fee-for-service analogue. Medicare pays the ASC rate when the procedure is on the ASC Covered Procedures List and is performed in an ASC; it does not conduct a site-of-service medical necessity review of that election. Commercial payers do. Several major national payers now conduct site-of-service review as part of prior authorization and, in the general pattern, conduct that review when the hospital outpatient department is the requested setting, treating the ASC as the default expected site for a defined code list.

GoHealthcare Clinical Insight: the medical necessity statement that works

A defensible medical necessity statement is a paragraph, authored by the physician, that a reviewer can read once and approve. It contains six elements, in this order:

1. The diagnosis, with anatomic level and laterality.
2. The symptom duration and the functional impairment, in specific terms.
3. The conservative care attempted, with modalities, dates, and documented outcome.
4. The imaging finding and the explicit statement of how it correlates to the presentation at that level and side.
5. The procedure requested and why it is the appropriate next intervention rather than a further conservative trial.
6. The site of service and why it is appropriate for this patient.

Six elements, authored once, reused as a structured template. Practices that adopt this consistently report the largest single improvement in first-pass approval of any intervention we recommend - not because the clinical facts changed, but because the reviewer no longer has to hunt for them across a forty-page packet.

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11

Medicare Coverage and the Three Concurrent Prior Authorization Regimes

As of 2026, three distinct Medicare fee-for-service prior authorization regimes operate simultaneously, and they have different scopes, different geographies, different service lists, and different consequences for non-participation. Confusing them is the most consequential conceptual error in Medicare ASC authorization, and it produces errors in both directions: facilities that submit unnecessary requests, and facilities that fail to submit required ones.

	OPD Prior Authorization Program	ASC Prior Authorization Demonstration	WISeR Model
Authority	42 CFR 419.83; established by CY 2020 OPPS/ASC Final Rule (CMS-1717-FC) and expanded by subsequent rules.	Five-year CMS demonstration project.	CMS Innovation Center payment model, 2026 through 2031.
Setting	Hospital outpatient department only.	Ambulatory surgery center facility services only, identified by place of service 24 with type of service F or provider specialty code 49.	Part B services in the model states; not limited to a single facility type. Hospital inpatient services are excluded.
Geography	Nationwide.	Ten states: California, Florida, Georgia, Maryland, New York, Pennsylvania, Tennessee (Phase 1); Texas, Arizona, Ohio (Phase 2).	Six states: New Jersey, Ohio, Oklahoma, Texas, Arizona, Washington.
Effective dates	Rolling by category: five categories from July 1, 2020; implanted spinal neurostimulators and cervical fusion with disc removal from July 1, 2021; facet joint interventions from July 1, 2023.	Phase 1: requests accepted January 5, 2026 for dates of service on or after January 19, 2026. Phase 2: requests accepted February 2, 2026 for dates of service on or after February 16, 2026.	Model launched January 1, 2026; requests accepted from January 5, 2026 for services on or after January 15, 2026.
Service categories	Blepharoplasty; botulinum toxin injections; panniculectomy; rhinoplasty; vein ablation; implanted spinal neurostimulators; cervical fusion with disc removal; facet joint interventions.	Blepharoplasty; botulinum toxin injections; panniculectomy; rhinoplasty; vein ablation. Cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions are expressly not included at this time.	Includes epidural steroid injections for pain management excluding facet joint injections; electrical nerve stimulator implants; percutaneous vertebral augmentation; cervical fusion; percutaneous image-guided lumbar decompression; arthroscopic lavage and debridement for the osteoarthritic knee; hypoglossal nerve stimulation; skin and tissue substitutes; and others.
Mandatory or voluntary	Condition of payment for the listed categories.	Voluntary in form. Bypassing prior authorization subjects the claim to prepayment medical review rather than avoiding review.	Voluntary in form, with the same structure: prior authorization or prepayment review.
Applies to Medicare Advantage	No. Fee-for-service only.	No. Fee-for-service only.	No. Traditional fee-for-service Medicare only.
Exemption pathway	Established exemption process for providers demonstrating sustained compliance; exemption applies across all categories combined.	CMS has stated it plans to implement an exemption process for providers demonstrating continued compliance.	CMS has indicated an intent to pilot a gold-carding feature exempting clinicians with consistent approval histories.

The single most important Medicare fact for a musculoskeletal ASC in 2026

The three Medicare fee-for-service categories most relevant to musculoskeletal specialty practice - cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions - are subject to nationwide mandatory prior authorization in the hospital outpatient department, and are expressly excluded from the ASC prior authorization demonstration.

CMS has stated its rationale directly: utilization of the demonstration categories rose in the ASC setting between 2019 and 2021, and CMS attributes that rise in part to services shifting out of the hospital outpatient department while the OPD program continued. The demonstration was designed to address that migration for the five cosmetic-risk categories.

For MSK organizations the operational implication is significant but must be stated carefully. Site-of-service decisions must be driven by clinical appropriateness and patient safety, and any pattern of steering that is not clinically grounded carries program integrity exposure. What leadership should take from this is not a steering strategy but a forecasting one: the asymmetry is visible to CMS, CMS has said so in writing, and organizations should plan for the MSK categories to be added to the ASC demonstration or an equivalent mechanism rather than assume the current gap is durable.

The practical preparation is to build MSK authorization documentation to the OPD program standard today, in every setting, regardless of whether it is currently required.

ASC demonstration mechanics

For facilities in the ten demonstration states, the operational mechanics are specific and unforgiving. There is no prescribed request form; MACs may make voluntary cover sheets available. Requests may be submitted by fax, mail, Electronic Submission of Medical Documentation, or MAC electronic portal. The request must include documentation from the medical record sufficient to establish compliance with applicable coverage, coding, and payment rules. CMS has stated that the demonstration does not create new documentation requirements; it requires existing documentation earlier in the process.

Mechanic	Requirement
Decision timeframe	Seven days for standard review; two business days for expedited review. Expedited review is available where delay could seriously jeopardize life, health, or the ability to regain maximum function.
Decision types	Provisional affirmation; non-affirmation; provisional partial affirmation, where some requested services are affirmed and others are not.
Unique tracking number	A UTN is issued with the decision letter and must be reported on the claim to receive payment and prevent prepayment review. One UTN is issued per request regardless of the number of procedures requested; in a partial affirmation the UTN is encoded to match decisions to procedures.
UTN validity	120 days, with the decision date counted as the first day. A provisional affirmation is likewise valid for 120 days. Services falling outside that window require a new request.
Repeat and staged procedures	Each procedure requires its own request. A UTN for botulinum toxin injection or vein ablation is valid for one claim, even where a subsequent service falls within the 120-day window.
Claim reporting - electronic	On the 837 professional claim, the UTN is reported in the 2300 claim information loop, prior authorization REF segment, with REF01 equal to the G1 qualifier and REF02 equal to the UTN. A UTN reported at that level applies to the entire claim unless overridden in the 2400 service line loop.
Claim reporting - paper	On the CMS-1500 form, the UTN populates the first fourteen positions of item 23, with all other item 23 data beginning at position 15.
Who reports the UTN	The ASC facility only. Physicians and other practitioners submit claims as usual and should not report the UTN.
Consequence of bypassing	The claim is stopped for prepayment medical review. The MAC issues an Additional Documentation Request; the provider has 45 days to respond; the MAC has 30 days to review and determine.

Mechanic	Requirement
Associated services	Associated and related services, including anesthesia and physician services, will not be paid where the ASC service received a non-affirmation or where the facility claim was denied after prepayment review.
Appeal posture	A non-affirmation is not an initial determination and is not appealable. Requests may be resubmitted an unlimited number of times. If a claim is submitted and denied, that denial is an initial determination and is appealable.
Post-payment exposure	Claims with a provisional affirmation are generally protected from additional review, subject to targeted review where there is evidence of potential fraud or gaming, and to Comprehensive Error Rate Testing random sampling.
Beneficiary notice	Where a service is expected to be denied as not reasonable and necessary, an ABN must be issued in advance and the claim submitted with the GA modifier. Where denial is expected under the statutory cosmetic exclusion, the ABN is voluntary and the GX modifier applies.
Medicare Secondary Payer	Where payment is sought from Medicare as secondary payer for an applicable ASC service, prior authorization should be obtained and the UTN reported.
Retroactive requests	Not permitted. The request must be submitted before the service is furnished.

Codes removed from the ASC demonstration list

CMS removed CPT® codes 36474, 36476, 36479, 36483, and 15847 from the ASC prior authorization list on the basis that these codes are incidental or integral to primary services and are packaged into the facility payment for those primary services. Because they cannot be processed separately on facility claims, prior authorization for them is unnecessary. Prior authorization continues to apply to the primary procedures that include these services. Facilities should confirm the current code list with their MAC, as CMS maintains and updates it.

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Commercial Payer and Utilization Management Vendor Comparison

Commercial authorization for ASC services is administered through two layers: the health plan's own medical policy and authorization requirements, and the specialty utilization management vendor to which the plan has delegated review for particular service categories. For musculoskeletal and spine services, the vendor layer is frequently the operative one, and the vendor assignment varies by plan, by product line, by state, and by employer group. Verifying the correct vendor for the specific member is a distinct workflow step, not an assumption.

Payer or vendor	Typical role in the ASC context	Operational emphasis
eviCore healthcare	Delegated review for musculoskeletal, spine surgery, interventional pain, and advanced imaging across numerous commercial and Medicare Advantage plans.	Structured criteria with explicit conservative care duration and imaging requirements. Submission through the vendor portal with complete clinical attachment substantially outperforms telephonic submission.
Carelon Medical Benefits Management	Delegated review for musculoskeletal, spine, joint, and pain management programs, particularly across Elevance Health and affiliated Blue plans.	Site-of-service considerations are integrated into several program criteria. Guideline versions are dated and updated on a defined cycle; the version in effect on the date of service governs.
Cohere Health	Delegated review with an emphasis on episode-based authorization and digital submission across musculoskeletal service lines.	Episode constructs can authorize a care pathway rather than a single event. Understanding what the episode covers prevents redundant requests and unauthorized adjuncts.

Payer or vendor	Typical role in the ASC context	Operational emphasis
Evolent	Delegated specialty benefit management including musculoskeletal and surgical programs for selected health plans.	Program scope differs materially by plan contract. Confirm scope for the specific member rather than assuming consistency across a payer's book of business.
TurningPoint Healthcare Solutions	Delegated surgical quality and utilization management for musculoskeletal, spine, and joint replacement programs for selected plans.	Programs frequently include implant and device review alongside procedure review, which is directly relevant to device-intensive ASC cases.
UnitedHealthcare	Prior authorization plus site-of-service medical necessity review. Published medical policies address outpatient surgical procedures and office-based procedures by site of service.	Under the general policy structure, site-of-service review is conducted where the hospital outpatient department is requested; the ASC is treated as an expected site for a defined code list. State and territory exceptions apply and must be verified against the current policy.
Aetna	Precertification requirements for defined surgical categories, with clinical policy bulletins establishing medical necessity criteria.	Policy bulletin criteria are specific and are applied literally. Aligning the submission to the bulletin's enumerated criteria in order is materially more effective than narrative.
Cigna Healthcare	Precertification for defined categories with published coverage policies, and delegated vendor review for selected musculoskeletal programs.	Verify whether the specific service is plan-reviewed or vendor-reviewed before submission; misrouted requests lose days.
Humana	Preauthorization for surgical services across commercial and Medicare Advantage, with delegated vendor review for selected categories.	Medicare Advantage requests must be evaluated against Traditional Medicare criteria where such criteria exist; citing the applicable LCD in the request is effective.
Blue Cross Blue Shield plans	Independent licensees with materially different policies, vendors, and portals by state and by product.	Never generalize across Blue plans. Out-of-area members under the BlueCard program follow the home plan's medical policy while the local plan handles claims - a frequent source of authorization failure.
Molina, Centene and affiliates, WellCare	Managed Medicaid and Marketplace authorization with state-specific requirements layered over corporate policy.	State Medicaid rules frequently impose additional requirements and shorter timely filing windows. State-specific workflow is mandatory.
Kaiser Permanente	Integrated delivery model; external ASC utilization generally requires prior referral and authorization through the plan's internal process.	Out-of-network ASC use is exceptional and requires documented internal authorization before scheduling.

Where payers converge and diverge

Dimension	Convergence	Divergence
Conservative therapy	Nearly universal requirement for elective MSK procedures, with modality, duration, and outcome documentation expected.	Required duration varies materially by payer and procedure, as does whether supervised therapy is required or a documented home program suffices.
Imaging	Advanced imaging correlating to the clinical presentation is expected for spine and most joint procedures.	Recency windows differ, as does whether the payer requires the full report, the images, or physician interpretation only.
Functional measurement	Increasing expectation of a validated instrument.	Some policies specify an instrument and a threshold score; others accept any documented functional limitation.

Dimension	Convergence	Divergence
Site of service	Growing consensus that the ASC is the expected default for a defined set of outpatient surgical codes.	Whether site-of-service review is a separate determination, an element of the procedure review, or a payment policy applied after the fact varies by payer.
Facility versus professional authorization	Most payers require authorization for the technical component in some form.	Whether one authorization covers both components, whether the facility must obtain its own, and whether the authorization is issued to a tax identification number or a national provider identifier varies substantially.
Implants and devices	High-cost implants attract scrutiny in device-intensive procedures.	Some payers authorize the implant separately, some fold it into the procedure authorization, and some require invoice submission at the claim stage rather than at authorization.

The Carelon artificial intelligence clause

Carelon guideline documentation includes provisions addressing the use of artificial intelligence in connection with its guideline content. Any GoHealthcare guide that draws on Carelon guideline content for commercial publication should be reviewed by counsel before release. This guide synthesizes payer requirements at a general operational level and does not reproduce Carelon guideline language, but the review requirement is carried forward from Batch B02 and remains open.

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Prior Authorization Workflow

The workflow below is the reference model GoHealthcare uses when assessing or rebuilding an ASC authorization function. It is expressed in stages rather than in days, because the appropriate lead time varies by payer, vendor, and procedure. What does not vary is the sequence.

Stage	Actions	Failure if skipped
1. Clinical decision and case creation	Physician determines the procedure, anatomic site, laterality, and intended site of service. Preliminary CPT® and ICD-10-CM assignment is made by a qualified coder rather than estimated by scheduling.	Authorization obtained for the wrong code set, requiring a new request after the case is already scheduled.
2. Eligibility, benefits, and network verification	Verify member eligibility, the specific benefit category, remaining benefit, cost share, and network status for the facility tax identification number, the physician, and the anesthesia group separately.	An authorized case at an out-of-network facility, or a case against an exhausted benefit. Authorization is not a guarantee of payment.
3. Requirement and vendor determination	Determine whether authorization is required, for which components, and by whom - the plan directly or a delegated vendor. Confirm for the specific member and product, not the payer generally.	Request submitted to the wrong entity, consuming the lead time and producing no determination.
4. Clinical packet assembly	Assemble the medical necessity documentation set: history, examination, conservative care with dates, imaging with physician correlation, functional measures, and the physician medical necessity statement.	First-pass adverse determination on documentation grounds, which is the most common and most preventable failure.
5. Submission	Submit through the payer's or vendor's preferred electronic channel with complete clinical attachment. Record the confirmation, the submission date and time, and the reference number.	No defensible record of a timely request when a timeliness dispute arises later.

Stage	Actions	Failure if skipped
6. Determination tracking	Track to determination against the applicable regulatory or contractual timeframe. Escalate at defined intervals rather than waiting.	Silent expiration of the lead time, discovered at the pre-op huddle.
7. Determination capture	Capture the authorization number, authorized CPT® codes, authorized units, authorized site of service, authorized provider, and effective and expiration dates into both the practice and the facility record.	The facility bills against an authorization it cannot see, and cannot appeal a denial it cannot document.
8. Peer-to-peer or reconsideration	Where an adverse determination issues, evaluate whether the deficiency is documentary or substantive. Correct and resubmit where documentary; request peer-to-peer where substantive, with the physician prepared on the specific criterion at issue.	A peer-to-peer conducted without knowing which criterion failed, which rarely succeeds.
9. Pre-service reconciliation	Before the case proceeds, reconcile the authorization against the scheduled procedure: codes, laterality, level, units, site, provider, and date within the validity window.	The single highest-yield control in the entire workflow, and the one most frequently absent.
10. Intra-operative change management	Where the procedure performed differs materially from the procedure authorized, flag the case immediately for retrospective authorization or a documented exception pathway.	A denial discovered thirty days later with no contemporaneous documentation of the change.
11. Post-service documentation linkage	Link the authorization number to the facility claim, the professional claim, and the anesthesia claim as each payer requires. Report the Medicare UTN in the correct field.	Claim rejected or stopped for prepayment review despite a valid authorization on file.
12. Outcome capture and feedback	Record the determination outcome, the reason for any adverse determination, and the resolution. Aggregate by payer, vendor, physician, procedure, and denial reason.	The same preventable denial recurring indefinitely because no one is measuring it.

The facility-versus-professional authorization problem

This deserves separate treatment because it is the structural feature that most distinguishes ASC authorization from office-based authorization, and because it is the most common cause of facility denials in centers where the practice performs authorization on the facility's behalf.

A single ASC case generates independent claims from independent billing entities. Depending on the payer, an authorization may be issued to the requesting physician's national provider identifier only, to the facility's tax identification number only, or to both. Where the authorization is issued to the physician and the facility bills under a different tax identification number, the facility claim may deny for absence of authorization even though a valid authorization exists for the same service on the same date. Anesthesia is a third entity, frequently overlooked, and in some payer configurations requires its own authorization or at minimum must reference the primary authorization.

Under the Medicare ASC prior authorization demonstration, the linkage is explicit and adverse: associated and related services, including anesthesia and physician services, will not be paid where the ASC facility service received a non-affirmation or where the facility claim was denied after prepayment review. Each provider must file its own appeal. A single facility-side failure therefore propagates to every provider on the case.

GoHealthcare Prior Authorization Insight: the pre-service reconciliation huddle

If an organization adopts one control from this guide, it should be this one. Forty-eight to seventy-two hours before the date of service, a single reviewer reconciles each scheduled case against seven fields:

• Authorization number present and captured in the facility record
• Authorized CPT® codes matching the scheduled procedure exactly
• Authorized units sufficient for the planned levels or sites
• Authorized site of service matching the facility where the case is booked
• Authorized rendering provider matching the operating physician
• Date of service falling inside the authorization validity window
• Facility, physician, and anesthesia authorizations each present where separately required

This takes a trained reviewer roughly ninety seconds per case. In the organizations where we have implemented it, it consistently surfaces a meaningful share of scheduled cases carrying a defect that would have produced a denial - most commonly a code mismatch following a change in the operative plan, or a site-of-service mismatch following a schedule move. Both are trivially correctable before the case and effectively uncorrectable after it.

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Common Prior Authorization Denials and Adverse Determinations

The denial patterns below are ordered by frequency as observed across musculoskeletal ASC operations. The distinction that matters operationally is between administrative failures, which are fully preventable through process control, and clinical failures, which require documentation improvement or genuine reconsideration of the clinical plan.

Denial reason	Category	Root cause	Prevention
Insufficient documentation of failed conservative treatment	Clinical	Conservative care documented in narrative without modality, dates, duration, adherence, or outcome.	Structured conservative care documentation captured prospectively at each encounter.
No authorization on file for the facility component	Administrative	Authorization obtained for the professional service only, or issued to an NPI while the facility bills under a different TIN.	Separate verification of facility authorization; capture of the authorization into the facility record before scheduling confirmation.
Site of service not medically necessary	Clinical	Hospital outpatient department requested without documented patient-specific justification.	Site-specific justification paragraph addressing the payer's enumerated criteria, or redirection of the case to the ASC where clinically appropriate.
Procedure code mismatch between authorization and claim	Administrative	Operative plan changed after authorization; additional level or site added; code corrected by coding after the authorization issued.	Pre-service reconciliation; a defined intra-operative change escalation pathway.
Imaging not submitted, outdated, or not correlated	Clinical	Radiology report attached without physician interpretation, or a study outside the policy's recency window.	Imaging currency check at packet assembly; mandatory physician correlation statement.
Diagnosis code does not support the procedure	Administrative and clinical	Unspecified or non-billable code, wrong laterality, wrong anatomic region, or a code outside the payer's covered diagnosis list.	Coder review of diagnosis specificity before submission, verified against the applicable LCD or policy diagnosis list.

Denial reason	Category	Root cause	Prevention
Units or levels exceed authorized quantity	Administrative	Multi-level procedure authorized for fewer levels than performed.	Explicit level and unit specification at request; reconciliation before the case.
Authorization expired before the date of service	Administrative	Case rescheduled beyond the validity window without re-authorization.	Validity date tracked as a scheduling field with automated alerting on reschedule.
Member not eligible or benefit exhausted	Administrative	Eligibility verified once at scheduling and never re-verified.	Re-verification within a defined window of the date of service.
Facility out of network	Administrative	Network status assumed from the physician's status rather than verified for the facility TIN.	Independent network verification for each billing entity on the case.
Procedure not on the ASC Covered Procedures List	Administrative	Medicare case scheduled for a procedure not payable in the ASC setting.	Scheduling edit against the current CPL and annual addenda, refreshed each January.
Request submitted to the wrong reviewing entity	Administrative	Vendor assignment assumed rather than verified for the specific member and product.	Vendor determination as an explicit workflow step with a payer-and-product matrix.
Non-affirmation under a Medicare program for medical necessity	Clinical	Documentation did not establish compliance with the applicable LCD or coverage policy.	Build the request to the LCD's enumerated criteria in the LCD's own order and terminology.
Implant or device not separately authorized	Administrative	Device-intensive case authorized for the procedure only where the payer requires separate device review.	Device authorization treated as a distinct requirement in the payer matrix.

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Appeal Strategies and Peer-to-Peer Considerations

Appeal strategy begins with correctly classifying what has actually happened, because the available remedies differ fundamentally and choosing the wrong one wastes the timeline.

Classify the adverse event

Event	Nature	Available remedy
Medicare ASC demonstration or WISeR non-affirmation	Not an initial determination.	Not appealable. Resubmission is permitted an unlimited number of times. Correct the deficiency identified in the decision letter and resubmit.
Medicare claim denial following a non-affirmed or bypassed service	An initial determination.	The standard Medicare appeals sequence: redetermination by the MAC, reconsideration by a Qualified Independent Contractor, Administrative Law Judge hearing, Medicare Appeals Council, judicial review.
Medicare Advantage pre-service adverse organization determination	An organization determination.	Plan reconsideration, followed by independent review entity review, with expedited timeframes available where the standard timeframe could seriously jeopardize the enrollee.
Commercial pre-service adverse determination	An adverse benefit determination.	Internal appeal, then external review under the applicable state or federal process. Expedited internal and external review available for urgent care claims.

Event	Nature	Available remedy
Commercial post-service denial	A post-service adverse benefit determination.	Internal appeal, then external review, subject to the contract's timely filing and appeal windows.
Administrative rejection or edit	Not a medical necessity determination at all.	Correction and resubmission. Filing a clinical appeal against an administrative rejection is a common and costly misclassification.

What strengthens an appeal

• A direct, point-by-point response to the specific reason stated in the adverse determination, rather than a resubmission of the original packet with a cover letter.

• Citation of the exact policy provision, LCD section, or vendor criterion the documentation satisfies, using the payer's own terminology and numbering.
• New or previously omitted clinical information affirmatively identified as new, with an explanation of why it was not in the original submission.
• A physician letter written by the treating physician, addressed to the criterion at issue, not a generic template.
• Objective functional data demonstrating trajectory rather than a single measurement.
• Where site of service is the issue, the specific clinical factor requiring the requested setting, with supporting evaluation from anesthesia or the relevant consultant.
• Documented urgency where clinically present, invoking the expedited pathway rather than the standard one.
• For Medicare denials, explicit alignment to the LCD's coverage criteria in the LCD's own order, which materially shortens reviewer time.

Avoiding unnecessary peer-to-peer review

Peer-to-peer review is expensive. It consumes physician clinical time, delays the case, and frequently resolves a question that the medical record should already have answered. The operational objective is not to win peer-to-peer reviews but to make them unnecessary.

In our experience the majority of peer-to-peer reviews in musculoskeletal authorization are triggered by one of three documentation gaps: conservative care lacking dates and outcome, imaging lacking physician correlation to the clinical presentation, or absence of any objective functional measure. Where those three are present and specific in the original submission, the reviewer generally has what is needed to affirm. Where a peer-to-peer is nonetheless required, the physician should be briefed on the specific criterion at issue before the call, and the call should be scheduled rather than accepted opportunistically, so the physician has the chart in front of them.

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Coding and Billing Overview

This section provides the operational coding context necessary to obtain and defend authorization. Detailed reimbursement methodology, fee schedules, payment rates, NCCI edit tables, and Medically Unlikely Edit values are addressed in the GoHealthcare Revenue Cycle Knowledge Center and are outside the scope of this guide.

Claim structure

Medicare ASC facility services are billed on the professional claim format - the CMS-1500 or the 837 professional transaction - not on the institutional claim format used by hospital outpatient departments. This is a persistent source of confusion in organizations that operate both settings, and it has direct authorization consequences: the UTN field locations under the ASC demonstration are the professional claim locations, and the ASC setting is identified by place of service 24 with type of service F or provider specialty code 49.

General coding considerations for the ASC

• The ASC reports the same CPT® code as the operating physician for the surgical procedure performed. Divergence between the facility and professional code sets on the same case is an audit signal and a denial driver.

• Services, drugs, devices, and supplies packaged into the payment allowance for a covered surgical procedure must not be reported as separate line items or separate charges.
• Drugs and biologicals eligible for separate payment should be reported with the correct HCPCS Level II code and correct units.

• Covered ancillary services eligible for separate payment under the ASC payment system are defined by CMS and identified through the annual ASC addenda.
• Device-intensive procedures are subject to a distinct payment methodology in which a device portion is identified; the annual addenda publish the device offset percentages and device portions.
• Where no claims data is available for a new device-intensive HCPCS code, CMS has applied a default device offset percentage that is the greater of 31 percent or the applicable APC device offset percentage.

• Coding must reflect the procedure actually performed, not the procedure authorized. Where these diverge, the correct response is to code accurately and manage the authorization variance, never to code to the authorization.

Documentation supporting code selection

• The operative report must independently support every code reported, including anatomic site, laterality, level, approach, and any separately reportable service.
• Level and laterality must be stated explicitly rather than inferred from the indication.
• Implants and devices must be documented with manufacturer, model, and where applicable lot or serial number, and the documentation must support the HCPCS code reported.
• Discontinued procedures must be documented with the point at which the procedure was terminated, since the modifier selection turns on whether anesthesia had been administered.
• Where a device is furnished at no cost or with credit, the documentation must support the credit modifier and the amount of the credit.

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Applicable CPT® Code Considerations

This guide addresses authorization for the ASC setting across service lines rather than a single procedure, so it does not enumerate a procedure code set. What follows are the code-related considerations that govern ASC authorization irrespective of the specific procedure. Procedure-specific code sets are provided in the individual procedure guides of the GoHealthcare MSK Specialty Procedure Library™.

Consideration	Operational requirement
ASC Covered Procedures List status	Confirm the code appears on the current Medicare ASC CPL before scheduling a Medicare beneficiary. Addendum AA of the annual ASC addenda identifies covered surgical procedures and their payment indicators; Addendum EE identifies surgical procedures excluded from Medicare payment in ASCs.
Payment indicator	The ASC payment indicator identifies whether the code is packaged, office-based, device-intensive, or subject to another payment characteristic. This drives both the payment expectation and, for device-intensive codes, the implant workflow.
Inpatient Only status during the transition	During the three-year IPO phase-out, confirm current-year status. A code removed from the IPO list becomes eligible for outpatient payment, but eligibility for the ASC specifically depends on its addition to the ASC CPL.
Add-on and multiple procedure structure	Where a procedure has add-on codes for additional levels or sites, the authorization request must specify the anticipated number of levels. Authorization for a base code does not authorize add-on codes.

Consideration	Operational requirement
Bilateral and staged procedures	Confirm whether the payer requires separate authorization for the contralateral side or the second stage. Under the Medicare ASC demonstration, each procedure requires its own request even where a prior affirmation remains within its validity window.
Unlisted codes	Unlisted CPT® codes are among the surgical procedures excluded from Medicare payment in the ASC. Commercial payers generally require a detailed narrative and comparison code at authorization, and lead time should be extended accordingly.
Category III codes	Frequently investigational under payer policy and denied on that basis rather than on documentation. Determine coverage posture before scheduling rather than after.
Code changes at the annual update	The annual CPT® update and the annual ASC addenda both take effect January 1. Authorizations obtained in the prior year for dates of service in the new year must be validated against the new code set.

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HCPCS Level II Code Considerations

HCPCS Level II reporting is materially more consequential in the ASC than in the office setting because of the packaging structure of ASC payment and the device-intensive payment methodology.

Category	Considerations
C-codes	C-codes describe devices and are used by facilities paid under the hospital outpatient prospective payment system, including devices eligible for pass-through payment. Certain implantable items with pass-through status under OPPS are separately payable in the ASC. Reporting requirements differ between the ASC and the hospital outpatient department and should not be assumed to be identical.
Device HCPCS for device-intensive procedures	For codes designated device-intensive, the facility should ensure the device is documented and reported consistently with CMS instruction. The annual ASC addenda publish device offset percentages and device portions.
Drugs and biologicals	Drugs and biologicals eligible for separate payment under the ASC payment system should be reported with the correct HCPCS code and units. Those packaged into the procedure allowance must not be separately reported.
Non-opioid pain management products	CMS finalized continuation of temporary additional payments for certain qualifying non-opioid treatments for pain relief in both the hospital outpatient department and ASC settings through December 31, 2027, with five drugs and eleven devices identified as separately payable in both settings starting in CY 2026. The qualifying product list is maintained by CMS and should be verified currently.
Skin substitutes	For CY 2026 CMS unpackaged skin substitute products from the application services and established payment based on product characteristics aligned to FDA regulatory status. Facilities using these products should confirm current-year reporting requirements.
Implant and supply codes generally	Where a payer requires invoice substantiation for a high-cost implant, that requirement is frequently a claim-stage requirement rather than an authorization-stage requirement. Both should be recorded in the payer matrix so neither is missed.

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Common ICD-10-CM Diagnosis Code Considerations

Diagnosis coding failures are a significant and underrecognized cause of authorization non-affirmation. Because this guide addresses the ASC setting generally rather than a single procedure, the guidance below addresses the failure patterns rather than a code list. Procedure-specific diagnosis code sets appear in the individual procedure guides.

Failure pattern	Description	Control
Non-billable parent code	Submission of a category or subcategory code where ICD-10-CM requires additional character specificity. Parent codes are not valid for reporting and are rejected or denied.	Coder validation of billable status for every diagnosis on the authorization request, not only on the claim.
Region mismatch	A cervical code submitted for a lumbar procedure, or a thoracic code in a lumbar request. Frequently a template artifact.	Region concordance check between the diagnosis, the imaging, the examination, and the requested procedure.
Laterality mismatch or absence	Where the code set provides laterality, an unspecified code or a code for the contralateral side undermines the request.	Laterality verified against the operative plan and the imaging.
Unspecified codes where specificity exists	Unspecified codes are frequently outside payer covered-diagnosis lists and signal incomplete documentation.	Specificity requirement enforced at the point of documentation rather than corrected at billing.
Diagnosis outside the covered list	The applicable LCD, Local Coverage Article, or payer policy enumerates covered diagnoses; a clinically accurate code outside that list will deny.	Cross-reference the diagnosis against the policy's covered list before submission and, where the accurate diagnosis is not covered, address coverage posture before scheduling.
Missing secondary and complication codes	Omission of codes that establish severity, chronicity, prior surgical status, or complication - each of which may be required by policy.	Documentation review for secondary conditions that support medical necessity, including post-procedural and sequela codes where applicable.
Diagnosis inconsistent between authorization and claim	The authorization was obtained on one diagnosis and the claim submitted with another.	Diagnosis included in the pre-service reconciliation alongside procedure codes.

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Applicable Modifiers and Place of Service

Modifier or code	Application in the ASC setting
POS 24	Ambulatory surgical center. The place of service code that defines the ASC setting for the Medicare ASC prior authorization demonstration, together with type of service F or provider specialty code 49.
POS 22	On-campus hospital outpatient department.
POS 19	Off-campus hospital outpatient department.
POS 21	Inpatient hospital.
POS 11	Physician office.
73	Discontinued outpatient hospital or ASC procedure prior to the administration of anesthesia. Applied where preparation for surgery has begun but anesthesia has not been administered.
74	Discontinued outpatient hospital or ASC procedure after the administration of anesthesia.
FB	Item provided without cost to the provider, supplier, or practitioner, or where full credit was received for a replaced device. ASCs are required to report FB on specified device-inclusive procedure codes in these circumstances.
FC	Partial credit received for a replaced device, applied where the credit is 50 percent or more of the device cost.
SG	ASC facility service. No longer required on Medicare ASC facility claims but still required by some commercial payers. Payer-specific requirement that must be maintained in the payer matrix.

Modifier or code	Application in the ASC setting
GA	Waiver of liability statement on file. Applied where an ABN was issued because payment is expected to be denied as not reasonable and necessary.
GX	Notice of liability issued, voluntary under payer policy. Applied where denial is expected under a statutory exclusion, such as the cosmetic services exclusion.
50, RT, LT	Bilateral and laterality reporting. Payer-specific conventions differ; the authorization must reflect the same laterality convention as the claim.
59 and X-series	Distinct procedural service. Application in the ASC follows the same principles as elsewhere; supporting documentation must establish the distinct nature of the service.

Place of service accuracy is not a clerical matter in this setting. It determines the payment system applied, the authorization requirement, and under the Medicare ASC demonstration the very applicability of the program. A case authorized for one place of service and billed under another will fail, and the failure will not be apparent until adjudication.

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Clinical Documentation Checklist

Before the authorization request is submitted

• Diagnosis confirmed, billable to the required character specificity, with correct region and laterality
• CPT® codes assigned by a qualified coder, with anticipated levels and units specified
• Eligibility, benefit category, remaining benefit, and cost share verified
• Network status verified independently for the facility TIN, the physician NPI, and the anesthesia group
• Reviewing entity confirmed for the specific member and product - plan direct or delegated vendor
• Conservative care documented with modality, dates, duration, adherence, and outcome
• Imaging current within the applicable policy window, with the full report available
• Physician correlation of imaging to clinical presentation at the specific level and side, documented in the note
• Validated functional instrument score recorded where the applicable policy requires one
• Physician medical necessity statement present, containing diagnosis, duration, functional impact, conservative care, imaging correlation, procedure rationale, and site rationale
• Site-of-service justification appropriate to the setting actually being requested
• Anesthesia preoperative evaluation obtained where required for site justification
• Implant or device plan documented with anticipated codes and any separate authorization requirement identified

Before the case proceeds

• Authorization number captured in the facility record, not only the practice record
• Authorized CPT® codes reconciled against the scheduled procedure
• Authorized units sufficient for the planned levels or sites
• Authorized site of service matching the facility where the case is booked
• Authorized rendering provider matching the operating physician
• Date of service inside the authorization validity window
• Facility, professional, and anesthesia authorizations each confirmed where separately required
• Medicare UTN obtained and recorded where the ASC demonstration applies
• ABN executed with the correct modifier pathway where a Medicare denial is anticipated
• Case selection policy applied and any exception documented with rationale

After the case

• Operative report supporting every code reported, with site, laterality, level, and approach stated explicitly
• Any material divergence between the authorized and performed procedure flagged the same day
• Implant documentation complete with manufacturer, model, and identifiers, supporting the HCPCS reported
• Authorization number and, where applicable, UTN linked to the facility claim in the correct field
• Professional and anesthesia claims linked to their respective authorizations
• Determination outcome and any denial reason recorded for aggregate analysis

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22

Setting Comparison: ASC, Hospital Outpatient Department, and Office

Dimension	Ambulatory surgery center	Hospital outpatient department	Physician office
Place of service	24	22 on-campus; 19 off-campus	11
Medicare payment system	ASC payment system	Hospital outpatient prospective payment system	Physician fee schedule, non-facility rate
Claim format	Professional claim format	Institutional claim format	Professional claim format
Covered procedure constraint	Limited to the Medicare ASC Covered Procedures List	Broader; constrained during the IPO transition by remaining IPO designations	Constrained by what can be safely and appropriately performed in the office
Medicare FFS prior authorization	Demonstration in ten states for five cosmetic-risk categories; MSK categories excluded at this time	Nationwide program for eight categories including cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions	No comparable setting-specific program; WISeR applies to Part B services in model states
Commercial site-of-service posture	Generally the expected default setting for a defined outpatient surgical code list	Frequently requires site-specific medical necessity justification	Some payers apply office-based site-of-service policies designating the office as expected for defined codes
Length of stay constraint	Expected duration not to exceed 24 hours; planned overnight recovery not permitted for Medicare beneficiaries	Observation services available; two-midnight framework applies to inpatient admission decisions	Same-day only
Implant and device payment	Device-intensive methodology with published device portions; certain pass-through items separately payable	OPPS device methodology including pass-through payment	Generally not applicable for major implants
Quality reporting program	Ambulatory Surgical Center Quality Reporting Program; 2.0 percentage point reduction for non-compliance	Hospital Outpatient Quality Reporting Program; 2.0 percentage point reduction for non-compliance	Merit-based Incentive Payment System where applicable
Accreditation and certification	Medicare Conditions for Coverage at 42 CFR Part 416; state licensure; optional accreditation with CMS-approved deeming authority	Medicare Conditions of Participation at 42 CFR Part 482	State licensure; office-based surgery regulation varies by state

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GoHealthcare Clinical Insights

The following recommendations reflect what we consistently observe distinguishing high-performing ASC authorization functions from average ones. None of them require additional headcount; all of them require deliberate process design.

Move documentation upstream, not authorization downstream

The instinct when authorization performance is poor is to add authorization staff. In most of the organizations we assess, the constraint is not authorization capacity but documentation quality arriving at the authorization function. An authorization specialist working from a note that lacks conservative care dates cannot manufacture them. Investment in structured clinical documentation at the point of the initial evaluation reliably outperforms equivalent investment in authorization staffing.

Maintain a living payer and vendor matrix

A single maintained matrix should record, for every payer and product the facility contracts with: whether facility authorization is required, whether professional authorization is separate, whether anesthesia requires its own, which entity reviews, the submission channel, the standard and expedited timeframes, the authorization validity period, whether implants require separate review, whether modifier SG is required, and the appeal windows. This document is the single highest-return artifact an ASC authorization function can maintain, and it is absent in most centers we assess.

Treat the facility record as the system of record for authorization

Where the practice performs authorization, the facility must still hold the authorization detail in its own record before the case is confirmed. The facility bills the facility claim; the facility appeals the facility denial; the facility must therefore hold the facility authorization. This is not redundancy, it is basic control.

Instrument the denial data

Denial reasons should be captured in structured fields and aggregated by payer, vendor, physician, procedure, and reason. Without that aggregation, an organization cannot distinguish a systemic payer policy change from an individual physician documentation gap, and will apply the wrong intervention to both. The most common finding when we first instrument a center's denial data is that a small number of reasons account for the large majority of preventable denials, and that no one had previously been able to see it.

Refresh everything each January

The CPT® update, the ASC Covered Procedures List, the annual addenda and payment indicators, the ASC conversion factor, payer medical policies, and vendor criteria versions all change on or near January 1. An annual reconciliation of the scheduling edits, the charge master, the payer matrix, and the authorization requirement table should be a scheduled operational event with an owner, not an ad hoc response to the first denial.

Communication between the practice and the authorization team

Where the operating physician and the authorization team do not communicate directly, authorization requests are constructed from whatever documentation happens to exist. The highest-functioning organizations establish a defined channel through which the authorization specialist can request a specific documentation element from the physician before submission, with an expected turnaround. The alternative - submitting an incomplete packet and waiting for the adverse determination to identify the gap - costs a full review cycle every time.

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GoHealthcare Leadership Perspective

The strategic environment for ambulatory surgery centers changed materially with the CY 2026 rule, and the change is easy to misread as purely favorable. The expansion of the ASC Covered Procedures List by 560 surgical procedures and the phase-out of the Inpatient Only list represent the largest single expansion of ASC scope in the program's history. They also represent a substantial transfer of clinical risk, financial risk, and administrative burden to facilities whose infrastructure was built for a narrower case mix.

Scope expansion is not the same as capability expansion

A procedure appearing on the ASC Covered Procedures List establishes Medicare payment eligibility. It does not establish that a given facility has the equipment, the staffing, the credentialed clinicians, the implant supply chain, the commercial contract rate, or the authorization pathway to perform it profitably and safely. Each of those is a separate organizational decision. The removal of five general exclusion criteria from the CPL criteria, recast as nonbinding physician safety considerations, transfers a judgment that CMS previously made categorically to the individual physician making it case by case. That is a governance obligation, and boards should treat it as one.

The authorization function is a strategic capability, not a clerical one

As acuity rises, the proportion of case value at risk from a single authorization defect rises with it. A denied facet injection is a modest write-off. A denied device-intensive fusion case with a five-figure implant is a materially different event, and it takes the anesthesia and professional claims with it under several of the programs described in this guide. Organizations that continue to staff and govern authorization as a clerical function while expanding into high-acuity, device-intensive case mix are accepting a risk they have not quantified.

Anticipate the regulatory direction rather than the current rule

Three signals point in the same direction. CMS has expressly identified the migration of prior-authorized services from the hospital outpatient department to the ASC setting as a rationale for the ASC demonstration. The WISeR Model extends prior authorization and prepayment review into Traditional Medicare for a set of predominantly musculoskeletal services. And CMS-0057-F imposes structural obligations on Medicare Advantage, Medicaid, CHIP, and Marketplace payers that will make electronic authorization the default channel. The reasonable planning assumption is more authorization, applied more uniformly across settings, conducted electronically, with faster required turnaround and greater transparency of payer performance.

What that implies operationally

• Build musculoskeletal authorization documentation to the most demanding applicable standard in every setting, rather than to the minimum currently required in each.
• Invest in structured clinical data capture at the point of care, because that is what electronic authorization will consume.
• Position for exemption and gold-carding programs, which reward demonstrable compliance history. The organizations that qualify will hold a durable administrative cost advantage.
• Treat CMS-0057-F payer metric reporting as a negotiation asset. Publicly reported approval, denial, and turnaround data creates leverage in contracting that did not previously exist.
• Govern case selection at the board and medical staff level, with documented criteria, documented exceptions, and outcome review, because the regulatory guardrail has been replaced by physician judgment and the record of that judgment.

On artificial intelligence in authorization

Utilization management is being automated on both sides of the transaction. The WISeR Model explicitly tests technology-enabled review by non-provider model participants, with the requirement that a human clinician with relevant expertise be involved where coverage is denied. Providers are simultaneously adopting automation for documentation assembly and submission. GoHealthcare's position is that automation on the provider side should be governed with the same rigor organizations expect of payers: documented criteria, human clinical review of any adverse or high-risk output, auditability of what the system produced and why, and clear accountability for the accuracy of anything submitted under a physician's name. An automated submission remains the provider's representation.

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GoHealthcare Case Study

The following is an original composite educational scenario. It does not describe any actual patient, physician, facility, or organization.

Clinical scenario

A multi-specialty musculoskeletal ASC operating in a state participating in both the Medicare ASC prior authorization demonstration and the WISeR Model experienced a sustained increase in facility denials over two quarters following an expansion of its spine service line. The center had added higher-acuity spine cases after the CY 2026 Covered Procedures List expansion. Case volume grew approximately twenty percent; facility denial dollars grew substantially faster.

Documentation challenges

A structured review of denied cases found that the center had no aggregated denial reason data. Denials were worked individually by the billing team and closed without categorization. When the denials were manually categorized for the first time, three patterns accounted for the large majority of preventable loss.

• Authorization had been obtained by the referring practice under the physician's national provider identifier, and the facility - billing under a different tax identification number - had no authorization of its own on file for a subset of commercial payers requiring facility-level authorization.
• In multi-level spine cases, authorization had been obtained for the base procedure without specification of levels, and add-on levels performed intra-operatively exceeded the authorized units.
• Conservative care documentation in the referring practice notes described treatment in narrative form without dates, attendance, or documented outcome, producing adverse determinations on medical necessity grounds that were then appealed with the same insufficient documentation.

Prior authorization barriers

Compounding these, the center had no payer matrix. Authorization requirements were determined case by case by telephone. Two payers had moved musculoskeletal review to a delegated vendor during the period; requests continued to be submitted to the health plan directly and were administratively closed, consuming the full lead time before anyone noticed.

Payer considerations

The commercial denials were concentrated in two payers with facility-level authorization requirements and active site-of-service policies. The Medicare denials were unrelated to the ASC demonstration, since the center's spine case mix fell outside the five demonstration categories. They arose instead from WISeR non-affirmations on epidural steroid injection cases where conservative care documentation did not establish compliance with the applicable Local Coverage Determination.

Operational workflow findings

• Authorization was performed entirely by the referring practices, with no facility-side verification or capture.
• Scheduling confirmed cases on verbal representation that authorization was in process.
• No pre-service reconciliation existed between the authorization on file and the scheduled procedure.
• Intra-operative changes to the operative plan were not routed to anyone before claim submission.
• Denial reasons were not captured in structured fields and could not be aggregated.

Resolution strategy

• A payer and vendor matrix was built covering every contracted payer and product, recording facility versus professional authorization requirements, reviewing entity, submission channel, timeframes, validity periods, and appeal windows. It was assigned a named owner and a quarterly review cycle.
• The scheduling policy was changed so that no case is confirmed until the facility holds the authorization number, authorized codes, authorized units, authorized site, and validity dates in its own record.

• A pre-service reconciliation was implemented forty-eight to seventy-two hours before each date of service against seven fields.
• A structured conservative care documentation template was implemented in the referring practices, capturing modality, start and end dates, visit counts, adherence, and a validated functional instrument at baseline and after the trial.
• For multi-level spine cases, the anticipated level count was made a mandatory field on the authorization request, with an intra-operative change escalation pathway routing same-day to the authorization team.
• Denial reasons were moved into structured fields with a controlled vocabulary and a monthly aggregate review by payer, vendor, physician, procedure, and reason.

Outcome

Within two quarters the center reported a substantial reduction in preventable facility denials, with the largest single contribution from the pre-service reconciliation step, which surfaced code, unit, and site mismatches while they remained correctable. Peer-to-peer review volume declined as conservative care and imaging correlation documentation improved. The payer matrix identified two additional contracts with facility-level authorization requirements that had not previously been recognized. The center's authorization staffing was unchanged.

Lessons learned

• Denial data that is not aggregated cannot be managed. Categorization was the prerequisite for every subsequent intervention.
• Facility authorization is the facility's responsibility even where the practice performs the work. Delegation of the task is not delegation of the risk.

• The pre-service reconciliation is the single highest-yield control available to an ASC and requires no additional technology.
• Conservative care documentation must be built prospectively at the point of care. It cannot be reconstructed at the point of authorization.

• Service line expansion must be accompanied by authorization infrastructure expansion, or the growth in denied dollars will outpace the growth in case volume.

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GoHealthcare Best Practices

Domain	Practice
Governance	A board-approved case selection policy reviewed annually and after each ASC Covered Procedures List update, with documented exception pathway and retrospective review of transfers and prolonged recoveries.

Domain	Practice
Payer intelligence	A maintained payer and vendor matrix covering authorization requirements by component, reviewing entity, channel, timeframes, validity, implant requirements, modifier requirements, and appeal windows, with a named owner and quarterly review.
Documentation	Structured capture of conservative care and validated functional measures at the point of care, and a standard six-element physician medical necessity statement template.
Verification	Independent verification of eligibility, benefits, and network status for each billing entity on the case, re-verified within a defined window of the date of service.
Scheduling control	No case confirmed until the facility holds the complete authorization detail in its own record.
Pre-service control	A seven-field reconciliation performed forty-eight to seventy-two hours before every case.
Change management	A defined same-day escalation pathway for any material divergence between the authorized and performed procedure.
Medicare program discipline	Explicit tracking of which Medicare program applies to which case - OPD program, ASC demonstration, WISeR, or none - with UTN capture and correct claim field reporting where applicable.
Appeals	Correct classification of the adverse event before selecting a remedy, and point-by-point response to the stated reason rather than resubmission of the original packet.
Measurement	Structured denial reason capture with monthly aggregation by payer, vendor, physician, procedure, and reason, reviewed by operational leadership.
Annual refresh	A scheduled January reconciliation of code sets, the Covered Procedures List and addenda, payer policies, vendor criteria versions, and scheduling edits.
Quality reporting	ASCQR compliance tracked on the operational dashboard alongside authorization performance, given its direct effect on the conversion factor applied.

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Common Mistakes

• Assuming the ASC setting relaxes medical necessity requirements. It does not. The coverage criteria for the procedure apply identically regardless of setting.

• Confusing the three Medicare prior authorization regimes. The nationwide OPD program does not apply to ASCs; the ASC demonstration covers five cosmetic-risk categories in ten states and excludes the musculoskeletal categories; WISeR operates in six states across a different service list.
• Treating the ASC demonstration as optional in substance. It is voluntary only in the sense that bypassing it substitutes prepayment review for prior review. It does not avoid review.
• Reporting the UTN on the professional claim. Under the ASC demonstration only the ASC facility reports the UTN; physicians and other practitioners bill as usual.
• Appealing a non-affirmation. A non-affirmation is not an initial determination and is not appealable. Resubmission is the remedy. Only a subsequent claim denial is appealable.
• Submitting hospital-justification language on an ASC request. This argues against the site being requested.

• Assuming one authorization covers facility, professional, and anesthesia. Frequently it does not, and the requirement varies by payer.
• Verifying network status for the physician and assuming it for the facility. These are separate contracts held by separate entities.

• Obtaining authorization for a base code without specifying levels. Add-on levels performed beyond the authorized units will deny.
• Attaching a radiology report without physician correlation. The reviewer needs the treating physician's statement linking the finding to the presentation at that level and side.

• Documenting conservative care in narrative without dates and outcomes. This is the most frequent single cause of adverse determination in musculoskeletal authorization.
• Rescheduling a case without checking the authorization validity window. A valid authorization expires quietly.

• Coding to the authorization rather than to the operative report. This is a compliance exposure, not a workaround. Code accurately and manage the variance.
• Scheduling a Medicare case for a procedure not on the ASC Covered Procedures List. A scheduling edit prevents this; nothing downstream does.

• Assuming vendor assignment from the payer name. Vendor delegation varies by product, state, and employer group, and changes without provider-facing announcement.
• Treating ASCQR reporting as a quality department matter. Non-compliance moves the conversion factor and is a revenue issue.

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Pearls and Pitfalls

Pearls

• Build the request to the payer's own criteria, in the payer's own order, using the payer's own terminology. Reviewer time is the scarce resource; a request that maps cleanly to the criteria set is affirmed faster and more often.
• The six-element medical necessity statement is the highest-leverage documentation artifact in musculoskeletal authorization. Standardize it once and reuse it.
• Capture functional instruments at baseline and after the conservative trial. Trajectory is more persuasive than a single score.
• Where the LCD applies, cite it explicitly and organize the submission to its criteria. This is particularly effective for Medicare Advantage, where plans must apply Traditional Medicare criteria where they exist.
• Use the expedited pathway where clinical urgency genuinely exists and is documented. It is underused, and the timeframes are materially shorter.
• Record the submission confirmation, date, time, and reference number every time. Timeliness disputes are won on documentation, not recollection.
• Treat a partial affirmation as a partial denial and manage the non-affirmed portion before the case, not after.

Pitfalls

• An authorization is not a guarantee of payment. Eligibility, benefit limits, network status, and coding accuracy all remain independent conditions of payment.
• A provisional affirmation is not immunity from review. Targeted review remains available where there is evidence of potential fraud or gaming, and Comprehensive Error Rate Testing sampling continues.
• Authorization validity periods are shorter than most schedulers assume, and the clock frequently starts at the decision date rather than the request date.

• Under the ASC demonstration, each procedure requires its own request even where a prior affirmation remains within its 120-day window - staged and repeat procedures are a common trap.
• A single UTN is issued per request even where multiple procedures were requested, and in a partial affirmation that UTN is encoded to match decisions to procedures. Claims submitted with non-affirmed procedures will be denied.

• Associated services fail with the facility service under the ASC demonstration, and each provider must file its own appeal. The facility's failure becomes the anesthesiologist's problem.
• Retroactive authorization is not available under the Medicare demonstration. The request must precede the service.
• State law and federal Conditions for Coverage diverge on extended recovery. The federal standard governs the Medicare beneficiary regardless of a more permissive state statute.

• BlueCard out-of-area members follow the home plan's medical policy while the local plan handles claims. Applying local policy to an out-of-area member produces a well-documented denial.

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Frequently Asked Questions

Q1. Does the nationwide Medicare prior authorization program for hospital outpatient department services apply to ambulatory surgery centers?

No. The program established at 42 CFR 419.83 applies to hospital outpatient departments. Its eight categories include cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions, and none of those requirements attach to an ASC facility service by virtue of that program.

Q2. What is the Medicare prior authorization demonstration for ASC services?

A five-year CMS demonstration operating in California, Florida, Georgia, Maryland, New York, Pennsylvania, Tennessee, Texas, Arizona, and Ohio. It covers blepharoplasty, botulinum toxin injections, panniculectomy, rhinoplasty, and vein ablation. Phase 1 states began accepting requests January 5, 2026 for dates of service on or after January 19, 2026; Texas, Arizona, and Ohio began accepting requests February 2, 2026 for dates of service on or after February 16, 2026.

Q3. Are spine and pain management procedures included in the ASC demonstration?

Not at this time. CMS has stated that cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions - the three musculoskeletal categories in the hospital outpatient department program - are not included in the ASC demonstration. Organizations should treat this as the current position rather than a permanent one.

Q4. Is participation in the ASC demonstration mandatory?

It is structured as voluntary, but bypassing prior authorization does not avoid review. A claim submitted without a prior authorization request is stopped for prepayment medical review, with an Additional Documentation Request, a 45-day provider response window, and a 30-day MAC review window. The practical choice is between review before the service and review before payment.

Q5. How long does a Medicare ASC demonstration decision take?

Seven days for standard review and two business days for expedited review. Expedited review is available where delay could seriously jeopardize the beneficiary's life, health, or ability to regain maximum function.

Q6. How long is a unique tracking number valid?

120 days, counting the decision date as the first day. A provisional affirmation carries the same 120-day validity. If the date of service falls outside that window, a new request is required.

Q7. If a UTN is valid for 120 days, can it cover two procedures within that window?

No. CMS has stated that each procedure requires its own request regardless of whether the next service falls within 120 days. A UTN for botulinum toxin injection or vein ablation is valid for one claim. This is a frequent trap for staged and repeat procedures.

Q8. Where is the UTN reported on the claim?

On the 837 professional transaction, in the 2300 claim information loop, prior authorization REF segment, with REF01 equal to the G1 qualifier and REF02 equal to the UTN. On the paper CMS-1500, the UTN populates the first fourteen positions of item 23, with other item 23 data beginning at position 15.

Q9. Should the physician also report the UTN on the professional claim?

No. Under the demonstration, only the ASC facility reports the UTN. Other billing practitioners submit claims as usual. However, related claims will not be paid if the ASC service subject to prior authorization or prepayment review is not eligible for payment.

Q10. Can a non-affirmation be appealed?

No. A non-affirmation is not an initial determination and is not appealable. Requests may be resubmitted an unlimited number of times. If a claim is subsequently submitted and denied, that denial is an initial determination and is appealable through the standard Medicare appeals sequence.

Q11. Does the ASC demonstration apply to Medicare Advantage patients?

No. It applies only to claims submitted to Medicare fee-for-service. Medicare Advantage authorization is governed by the plan's own requirements, subject to the requirement that plans apply Traditional Medicare coverage criteria where such criteria exist.

Q12. What is the WISeR Model and does it affect ASCs?

WISeR is a CMS Innovation Center model operating from 2026 through 2031 in New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. It applies prior authorization or prepayment review to selected Part B services including epidural steroid injections excluding facet joint injections, electrical nerve stimulator implants, percutaneous vertebral augmentation, cervical fusion, and percutaneous image-guided lumbar decompression. It is service-based rather than facility-type based, so ASC-performed services in scope are affected.

Q13. Does obtaining prior authorization guarantee payment?

No. Authorization addresses medical necessity. Payment additionally requires member eligibility, an available benefit, correct network status for the billing entity, accurate coding, timely filing, and compliance with all other payment rules.

Q14. Why did the facility claim deny when the physician had authorization?

Most commonly because the authorization was issued to the physician's national provider identifier and the payer requires facility-level authorization under the facility's tax identification number. Other frequent causes are a site-of-service mismatch, a code mismatch following a change in the operative plan, or units insufficient for the levels performed.

Q15. What is site-of-service medical necessity review?

A commercial construct in which the payer determines not only whether the procedure is medically necessary but whether the requested setting is. In the general pattern, the ASC is treated as the expected setting for a defined code list, and review is triggered when the hospital outpatient department is requested. Medicare fee-for-service does not conduct an equivalent review.

Q16. How should a request for the hospital outpatient department be constructed?

Around a specific, documented patient factor requiring hospital-level resources - cardiopulmonary instability, documented difficult airway, anticoagulation that cannot be safely interrupted, anticipated transfusion, or an anesthesia evaluation identifying a specific resource requirement. Generalized statements of complexity are routinely denied.

Q17. How much conservative treatment documentation is enough?

Enough to establish modality, start and end dates, duration, adherence, and outcome. The specific duration required varies by payer and procedure. The failure is almost never insufficient conservative care; it is insufficient documentation of the conservative care that occurred.

Q18. Is a radiology report sufficient imaging documentation?

Generally not on its own. Most adverse determinations on imaging grounds arise because the treating physician never correlated the finding to the clinical presentation at the specific level and side. The report establishes the finding; the physician note establishes its relevance.

Q19. What happens if the procedure performed differs from the procedure authorized?

The claim will not match the authorization and will deny. Code the operative report accurately - never code to the authorization - and route the variance the same day to the authorization team to pursue retrospective authorization or the payer's documented exception pathway. Contemporaneous documentation of the intra-operative change is essential.

Q20. Are implants and devices authorized separately?

It depends on the payer. Some fold the device into the procedure authorization, some require separate device review, and some require invoice substantiation at the claim stage rather than at authorization. This should be a recorded field in the payer matrix, because a device-intensive case denied for want of device authorization is a high-value loss.

Q21. Can an ASC keep a Medicare patient overnight?

No. Under 42 CFR 416.2 an ASC operates for patients whose expected duration of services would not exceed 24 hours following admission, and CMS survey guidance has stated that the regulations do not allow planned overnight recoveries in an ASC for approved procedures performed on Medicare patients. State law may differ, but the federal standard governs the Medicare beneficiary.

Q22. What changed in the ASC Covered Procedures List for CY 2026?

CMS revised the CPL criteria, eliminating five general exclusion criteria and recasting them as nonbinding physician considerations for patient safety. It added 289 procedures under the revised criteria and a further 271 codes removed from the Inpatient Only list, for 560 total surgical additions, plus ancillary service additions.

Q23. What is happening to the Inpatient Only list?

CMS finalized its elimination over a three-year transition beginning with CY 2026, removing 285 predominantly musculoskeletal procedures in the first year and assigning them to clinical ambulatory payment classifications, including a new Level 7 Musculoskeletal Procedures APC.

Q24. What is the CY 2026 ASC conversion factor?

$56.322 for ASCs meeting Ambulatory Surgical Center Quality Reporting Program requirements and $55.224 for those that do not, reflecting the 2.6 percent update and the statutory 2.0 percentage point reduction for non-compliance.

Q25. What does CMS-0057-F require and when?

Operational prior authorization provisions applicable to Medicare Advantage, Medicaid and CHIP, and Marketplace payers took effect generally on January 1, 2026, including decision timeframes of 72 hours for expedited and seven calendar days for standard requests, and specific denial reasons. Affected payers must implement the required application programming interfaces generally by January 1, 2027, with exact dates varying by payer type. Payer prior authorization metrics are publicly reported, with the first report due March 31, 2026 covering calendar year 2025.

Q26. Does modifier SG still need to be reported?

Not on Medicare ASC facility claims, where it is no longer required. Some commercial payers continue to require it. This is a payer-specific requirement that belongs in the payer matrix.

Q27. Which modifiers apply when a procedure is discontinued in an ASC?

Modifier 73 where the procedure was discontinued prior to the administration of anesthesia, and modifier 74 where it was discontinued after anesthesia was administered. The operative documentation must establish the point at which the procedure was terminated.

Q28. When are the FB and FC modifiers used?

FB where a specified device was furnished without cost to the provider or where full credit was received for a replaced device, and FC where partial credit of 50 percent or more of the device cost was received. Documentation must support the credit and its amount.

Q29. Which accrediting organizations can confer Medicare deemed status on an ASC?

CMS-approved accrediting organizations for ASCs include the Accreditation Association for Ambulatory Health Care, the American Association for Accreditation of Ambulatory Surgery Facilities (Quad A), The Joint Commission, and the Accreditation Commission for Health Care. Accreditation with deeming authority substitutes for a state agency survey for Medicare certification purposes.

Q30. How should an organization prepare for exemption or gold-carding programs?

By building a demonstrable compliance record now. CMS has stated it plans to implement an exemption process under the ASC demonstration for providers who continually show compliance, an exemption process already exists under the OPD program, and CMS has indicated an intent to pilot gold-carding under WISeR. All of these reward a documented history of affirmed determinations, which is produced by documentation discipline maintained before the program exists.

Q31. What is the single most effective control to reduce ASC authorization denials?

A pre-service reconciliation performed forty-eight to seventy-two hours before every case, checking seven fields: authorization number present in the facility record, authorized codes matching the scheduled procedure, authorized units sufficient for planned levels, authorized site matching the booked facility, authorized provider matching the operating physician, date of service within the validity window, and facility, professional, and anesthesia authorizations each present where separately required.

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Key Takeaways

• Three distinct Medicare fee-for-service prior authorization regimes operate simultaneously in 2026 with different scopes, geographies, and service lists. Correctly identifying which applies to a given case is the foundation of Medicare ASC authorization.

• The nationwide hospital outpatient department program does not apply to ASCs. The ASC demonstration covers five cosmetic-risk categories in ten states and expressly excludes the three musculoskeletal categories. WISeR operates in six states across a different, largely musculoskeletal service list.
• The current exclusion of musculoskeletal categories from the ASC demonstration should be treated as a planning assumption with a limited horizon, not a durable structural feature. CMS has stated in writing that it observes migration between settings.

• Under the ASC demonstration, bypassing prior authorization substitutes prepayment review rather than avoiding review; a non-affirmation is not appealable but may be resubmitted without limit; the UTN is valid 120 days and is reported by the facility only; and associated professional and anesthesia services fail with the facility service.
• CY 2026 expanded the ASC Covered Procedures List by 560 surgical procedures and began a three-year elimination of the Inpatient Only list. Scope expansion transfers clinical, financial, and administrative risk to facilities and requires corresponding governance.
• The elimination of five ASC CPL general exclusion criteria transfers case selection judgment to the physician. The documented exercise of that judgment is now the compliance record.
• Commercial site-of-service review treats the ASC as the expected setting for a defined code list. Argumentation must run in the direction of the setting actually requested.
• The facility must hold its own authorization record. Delegation of the authorization task to the practice is not delegation of the facility's risk.
• Conservative care and imaging correlation documentation, built prospectively at the point of care, are the two highest-yield clinical interventions for reducing adverse determinations and avoiding peer-to-peer review.
• A pre-service reconciliation of seven fields, performed forty-eight to seventy-two hours before each case, is the single highest-yield operational control and requires no additional technology.
• Authorization is not a guarantee of payment, and a provisional affirmation is not immunity from review.
• ASCQR compliance affects the conversion factor applied and belongs on the revenue cycle dashboard.

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Future Outlook

Continued migration of acuity into the ASC setting

The three-year elimination of the Inpatient Only list will continue to move procedures into outpatient eligibility, and the revised ASC Covered Procedures List criteria will continue to move a subset of those into ASC eligibility. Musculoskeletal procedures have been the leading edge of both movements. Facilities should expect the pace to continue and should plan capital, staffing, credentialing, implant supply chain, and authorization capacity against a case mix materially more complex than the one they operate today.

Expansion of prior authorization into Traditional Medicare

Prior authorization was historically a commercial and Medicare Advantage construct. The OPD program, the ASC demonstration, and the WISeR Model together represent a substantial extension into Traditional Medicare. The reasonable planning assumption is further extension by service category, by geography, or both, with the musculoskeletal categories a probable candidate for the ASC setting given CMS's stated rationale for the demonstration.

Electronic prior authorization becomes the default

CMS-0057-F obligates affected payers to implement Prior Authorization, Provider Access, Patient Access, and Payer-to-Payer application programming interfaces generally by January 1, 2027, with operational requirements already in effect. Providers should anticipate that the submission channel, the documentation format, and the turnaround expectation will all change. Organizations with structured clinical data will be positioned to consume these interfaces; organizations whose clinical documentation exists only as narrative will not.

Transparency as a contracting asset

Public reporting of payer prior authorization metrics - approval and denial rates, appeal outcomes, extended reviews, and average decision times - creates a data asset that did not previously exist. Sophisticated provider organizations will use it in contract negotiation and in network participation decisions.

Gold-carding and exemption

Exemption and gold-carding mechanisms are present or planned across all three Medicare programs and are proliferating in commercial and state contexts. These programs reward demonstrable compliance history. The organizations that qualify will carry a structural administrative cost advantage over those that do not, and qualification is determined by documentation discipline practiced before the program is announced.

Artificial intelligence on both sides of the transaction

The WISeR Model explicitly tests technology-enabled review by non-provider participants, with a requirement for human clinician involvement where coverage is denied. Providers are adopting automation for documentation assembly and submission. The governance question - who is accountable for the accuracy of an automated determination or an automated submission - is unresolved on both sides and will be a significant area of policy, contracting, and litigation activity.

Value-based arrangements in the ASC setting

CMS has signaled early consideration of value-based approaches for ASCs. Any movement in that direction would make quality reporting, outcome capture, and structured clinical data materially more consequential than they are under the current pay-for-reporting structure.

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References

1. Centers for Medicare & Medicaid Services. Calendar Year 2026 Hospital Outpatient Prospective Payment System (OPPS) and Ambulatory Surgical Center Final Rule (CMS-1834-FC), Fact Sheet. November 21, 2025. Website: https://www.cms.gov/newsroom/fac t-sheets/calendar-year-2026-hospital-outpatient-prospective-payment-system-opps-ambulatory-surgical-center

2. Centers for Medicare & Medicaid Services. Prior Authorization Demonstration for Certain Ambulatory Surgical Center (ASC) Services. Website: https://www.cms.gov/data-research/monitoring-programs/medicare-fee-service-compliance-programs/prior-authorization-pre- claim-review-initiatives/prior-authorization-demonstration-certain-ambulatory-surgical-center-services

3. Centers for Medicare & Medicaid Services. Prior Authorization Demonstration for Certain Ambulatory Surgical Center Services - Frequently Asked Questions. December 23, 2025. Website: https://www.cms.gov/files/document/asc-demonstration-faqs.pdf

4. Centers for Medicare & Medicaid Services. Prior Authorization for Certain Hospital Outpatient Department (OPD) Services. Website: https://www.cms.gov/data-research/monitoring-programs/medicare-fee-service-compliance-programs/prior-authorization-pre-claim-revi ew-initiatives/prior-authorization-certain-hospital-outpatient-department-opd-services

5. Centers for Medicare & Medicaid Services. Final List of Outpatient Department Services That Require Prior Authorization. Website: https://www.cms.gov/files/document/opd-services-require-prior-authorization.pdf

6. Electronic Code of Federal Regulations. 42 CFR 419.83 - List of hospital outpatient department services requiring prior authorization. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-419/subpart-I/section-419.83

7. Electronic Code of Federal Regulations. 42 CFR Part 416 - Ambulatory Surgical Services, including 42 CFR 416.2 (Definitions) and 42 CFR 416.44 (Conditions for Coverage: Environment). Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416

8. Electronic Code of Federal Regulations. 42 CFR 416.166 - Covered surgical procedures, including the requirements at paragraph (b)(2) and the physician considerations at paragraph (d), both effective January 1, 2026. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416/subpart-F/section-416.166

9. Centers for Medicare & Medicaid Services. Survey and Certification Letter S&C-04-22: Clarification of Policy Regarding Overnight Stays in an Ambulatory Surgical Center. Website: https://www.cms.gov/Medicare/Provider-Enrollment-and-Certification/SurveyCertificationGenInfo/downloads/SCLetter04-22.pdf

10. Centers for Medicare & Medicaid Services. Survey and Certification Letter S&C-02-16: Clarification of CMS Policies Regarding Ambulatory Surgical Centers. Website: https://www.cms.gov/medicare/provider-enrollment-and-certification/surveycertificationgeninfo/downloads/scletter02-16.pdf

11. Federal Register. Medicare Program; Implementation of Prior Authorization for Select Services for the Wasteful and Inappropriate Services Reduction (WISeR) Model. July 1, 2025. Website: https://www.federalregister.gov/documents/2025/07/01/2025-12195/medic are-program-implementation-of-prior-authorization-for-select-services-for-the-wasteful-and

12. Centers for Medicare & Medicaid Services. CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F), Fact Sheet. Website: https://www.cms.gov/newsroom/fact-sheets/cms-interoperability-prior-authorization-final-rule-cms-0057-f

13. Centers for Medicare & Medicaid Services. CMS-0057-F final rule text. Website: https://www.cms.gov/files/document/cms-0057-f.pdf

14. Centers for Medicare & Medicaid Services. Ambulatory Surgical Center Payment addenda, including Addendum AA (covered surgical procedures), Addendum DD1 (payment indicators), Addendum EE (procedures excluded from Medicare payment in ASCs), and Addendum FF (device offset percentages and device portions). Website: https://www.cms.gov/medicare/payment/prospective-payment-systems/ambulatory-surgical-center-asc

15. Centers for Medicare & Medicaid Services. Hospital Outpatient Prospective Payment System program page. Website: https://www.cms.gov/medicare/payment/prospective-payment-systems/hospital-outpatient

16. Centers for Medicare & Medicaid Services. Accrediting Organizations (AOs). Website: https://www.cms.gov/medicare/health-safety-standards/quality-safety-oversight-general-information/accrediting-organizations-aos

17. Centers for Medicare & Medicaid Services. Fact Sheet: Two-Midnight Rule. Website: https://www.cms.gov/newsroom/fact-sheets/fact-sheet-two-midnight-rule-0

18. Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual, Publication 100-04, Chapter 14 (Ambulatory Surgical Centers) and Chapter 30 (Financial Liability Protections). Website: https://www.cms.gov/medicare/regulations-guidance/manuals/internet-only-manuals-ioms

19. Centers for Medicare & Medicaid Services. Medicare Learning Network. Website: https://www.cms.gov/training-education/medicare-learning-network

20. UnitedHealthcare. Outpatient Surgical Procedures - Site of Service, medical policy. Website: https://www.uhcprovider.com/content/ dam/provider/docs/public/policies/comm-medical-drug/outpatient-surg-procedures-site-service.pdf

21. UnitedHealthcare. Office-Based Procedures - Site of Service, medical policy. Website: https://www.uhcprovider.com

22. UnitedHealthcare. Prior authorization and advance notification requirements. Website: https://www.uhcprovider.com/en/prior-auth-advance-notification.html

23. eviCore healthcare. Clinical guidelines. Website: https://www.evicore.com/provider/clinical-guidelines

24. Carelon Medical Benefits Management. Clinical appropriateness guidelines. Website: https://guidelines.carelonmedicalbenefitsmanagement.com

25. Cohere Health. Provider resources. Website: https://coherehealth.com

26. Evolent. Provider resources. Website: https://www.evolent.com

27. TurningPoint Healthcare Solutions. Provider resources. Website: https://www.turningpoint-healthcare.com

28. Aetna. Clinical Policy Bulletins. Website: https://www.aetna.com/health-care-professionals/clinical-policy-bulletins.html

29. Cigna Healthcare. Coverage policies. Website: https://static.cigna.com/assets/chcp/resourceLibrary/coveragePolicies/

30. Humana. Medical and pharmacy coverage policies. Website: https://www.humana.com/provider/medical-resources/clinical/coverage-policies

31. Blue Cross Blue Shield Association. Website: https://www.bcbs.com

32. Ambulatory Surgery Center Association. Accrediting organizations and regulatory resources. Website: https://www.ascassociation.org

33. Accreditation Association for Ambulatory Health Care. Medicare Deemed Status Accreditation. Website: https://www.aaahc.org

34. The Joint Commission. Ambulatory health care accreditation. Website: https://www.jointcommission.org

35. Quad A (American Association for Accreditation of Ambulatory Surgery Facilities). Website: https://www.quada.org

36. Accreditation Commission for Health Care. Website: https://www.achc.org

37. American Society of Interventional Pain Physicians. Website: https://www.asipp.org

38. North American Spine Society. Coverage recommendations and clinical guidelines. Website: https://www.spine.org

39. American Academy of Orthopaedic Surgeons. Clinical practice guidelines. Website: https://www.aaos.org

40. American Association of Neurological Surgeons. Website: https://www.aans.org

41. Congress of Neurological Surgeons. Website: https://www.cns.org

42. International Neuromodulation Society. Website: https://www.neuromodulation.com

43. American Society of Regional Anesthesia and Pain Medicine. Website: https://www.asra.com

44. Spine Intervention Society. Website: https://www.spineintervention.org

45. American Medical Association. CPT® Current Procedural Terminology. Website: https://www.ama-assn.org/practice-management/cpt

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Reading Recommendations

• The complete text of the CY 2026 OPPS/ASC Final Rule (CMS-1834-FC), with particular attention to the ASC Covered Procedures List criteria discussion and the Inpatient Only list elimination transition schedule.
• The CMS ASC prior authorization demonstration frequently asked questions document, which contains the operational detail - UTN mechanics, claim field locations, timeframes, and appeal posture - not found in the program summary pages.
• The current-year ASC addenda, specifically Addendum AA, Addendum DD1, Addendum EE, and Addendum FF, which together define what is payable, how, and with what device treatment.
• The applicable MAC Local Coverage Determinations and Local Coverage Articles for each procedure the facility performs, reviewed at least annually and after each revision notice.
• The Medicare Conditions for Coverage at 42 CFR Part 416, subparts B and C, read alongside the facility's accreditation standards.
• CMS-0057-F, with attention to the operational provisions already in effect and the API compliance dates applicable to each payer type.

• The primary utilization management vendor criteria sets applicable to the facility's payer mix, reviewed at each version change rather than at each denial.
• Peer-reviewed literature on outcomes and safety of ambulatory performance for the specific high-acuity procedures the facility is adding, published in sources such as The Spine Journal, Spine, the Journal of Bone and Joint Surgery, Pain Physician, and Neuromodulation.

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Related GoHealthcare Resources

This guide is Guide B04-01 in Batch B04, Ambulatory Surgery Center Operations, within the GoHealthcare MSK Specialty Procedure Library™. The following companion guides are planned or published in this batch and address topics referenced above in greater depth.

Guide	Focus	Status
B04-01 - ASC Prior Authorization	This guide.	Published

Guide	Focus	Status
B04-02 - ASC Documentation Requirements	Conditions for Coverage documentation, medical record standards, history and physical requirements, consent, and survey-ready documentation architecture.	Planned
B04-03 - Implant Authorization	Implant and device authorization workflow, device-intensive procedure economics, invoice substantiation, and vendor-specific requirements.	Planned
B04-04 - Medical Device Coverage	FDA clearance and approval status, coverage of devices by payer, HCPCS assignment, pass-through status, and investigational device determinations.	Planned
B04-05 - Same-Day Surgery Documentation	Preoperative through discharge documentation for the same-day episode, including anesthesia documentation and discharge criteria.	Planned
B04-06 - Observation versus Outpatient	The 24-hour standard, extended recovery, the two-midnight framework, transfer decisions, and the state-versus-federal divergence.	Planned
B04-07 - Medicare ASC Billing	ASC payment system mechanics, packaging, covered ancillary services, device-intensive methodology, and claim construction.	Planned
B04-08 - Commercial ASC Billing	Contract structures, carve-outs, implant reimbursement, out-of-network exposure, and federal and state balance billing protections.	Planned
B04-09 - Revenue Cycle for ASCs	End-to-end ASC revenue cycle design, key performance indicators, denial management, and underpayment recovery.	Planned
B04-10 - Compliance and Accreditation	Conditions for Coverage, accreditation with deeming authority, survey readiness, quality reporting, and the compliance program.	Planned

Related published batches include Batch B01 (Facet Joint Interventions), Batch B02 (Epidural Steroid Injections), and the Lumbar Spine Surgical Procedures series. All guides are available through the GoHealthcare Practice Solutions Knowledge Center. Website: https://www.gohealthcarellc.com

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Recommended Downloads

The following operational tools accompany this guide and are recommended for implementation.

• ASC Payer and Vendor Authorization Matrix template - a maintained record of authorization requirements by payer and product, covering facility versus professional requirements, reviewing entity, submission channel, standard and expedited timeframes, authorization validity period, implant requirements, modifier requirements, and appeal windows.

• Pre-Service Reconciliation Checklist - the seven-field verification performed forty-eight to seventy-two hours before each date of service.
• Six-Element Medical Necessity Statement template - the standardized physician statement covering diagnosis, duration and function, conservative care, imaging correlation, procedure rationale, and site rationale.
• Conservative Care Documentation template - structured capture of modality, dates, duration, adherence, functional instrument scores, and outcome, designed for prospective use at the point of care.

• Site-of-Service Justification worksheet - factor-by-factor documentation supporting the requested setting, with separate ASC and hospital outpatient department orientations.
• Medicare Program Applicability Decision Tree - determination of whether the OPD program, the ASC demonstration, WISeR, or none applies to a given case.

• ASC Case Selection Policy framework - governance template for the criteria, screening pathway, anesthesia review authority, exception pathway, and retrospective review.
• Denial Reason Taxonomy - controlled vocabulary for structured denial capture, designed to support aggregation by payer, vendor, physician, procedure, and reason.
• Annual January Refresh Checklist - the scheduled reconciliation of code sets, Covered Procedures List and addenda, payer policies, vendor criteria versions, and scheduling edits.

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Visual Recommendations

Visual	Purpose	Placement
Three-regime comparison matrix	Side-by-side comparison of the OPD program, the ASC demonstration, and WISeR across authority, setting, geography, dates, services, and consequences.	Medicare Coverage section; also suitable as a standalone one-page reference.
Medicare program applicability decision tree	Branching logic from state, setting, payer type, and service category to the applicable program and required action.	Prior Authorization Workflow section.
End-to-end authorization workflow process map	Swimlane diagram across practice, facility, payer or vendor, and scheduling, showing handoffs and the control points at which cases fail.	Prior Authorization Workflow section.
Pre-service reconciliation checklist card	A single-page, seven-field verification card designed for daily operational use.	Clinical Documentation Checklist section.
Setting comparison table	ASC, hospital outpatient department, and office across place of service, payment system, claim format, authorization posture, and length of stay constraint.	Setting Comparison section.
Site-of-service argumentation diagram	Two-column visual showing the opposite argument directions for an ASC request and a hospital outpatient department request.	Clinical Indications section.
Denial reason Pareto chart template	Illustrative aggregation of denial reasons by frequency and by dollars, demonstrating the concentration of preventable loss.	Common Denials section.
Six-element medical necessity statement diagram	Visual breakdown of the statement structure with an annotated example.	Medical Necessity section.
UTN lifecycle timeline	Decision date through the 120-day validity window, with claim reporting field locations for electronic and paper submission.	Medicare Coverage section.
Annual refresh calendar	Twelve-month operational calendar showing when code sets, addenda, payer policies, and vendor criteria change and who owns each reconciliation.	Best Practices section.

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Educational Disclaimer

Educational Disclaimer, Limitations, and Terms of Use

This guide is provided for educational and operational reference purposes only. By reading, distributing, or relying on this document, you acknowledge and accept the terms set out in this section in their entirety. If you do not accept these terms, do not use this document.

1. Purpose and scope

This guide addresses the operational, documentation, coverage, medical necessity, prior authorization, utilization management, coding, and compliance considerations that surround the delivery of musculoskeletal specialty care. It is a practice operations resource. It is expressly not a clinical textbook, a procedural technique manual, a physician training guide, a specialty society practice guideline, a coding manual, a payer policy manual, or a legal treatise.

This guide does not provide, and must not be used as a source of, procedural or surgical technique, needle or instrument placement instruction, anesthesia technique, medication selection or dosing, imaging technique, device programming, or any other instruction bearing on the physical performance of a procedure on a patient.

2. No professional advice and no professional relationship

Nothing in this guide constitutes medical, nursing, legal, regulatory, compliance, accounting, tax, actuarial, coding, billing, reimbursement, or consulting advice. Reading or relying on this guide does not create a physician-patient relationship, a clinician-patient relationship, an attorney-client relationship, an accountant-client relationship, a consulting engagement, or any other professional, contractual, or fiduciary relationship with GoHealthcare Practice Solutions, with its officers, employees, or contractors, or with the author.

Readers should obtain advice from their own qualified clinical, legal, compliance, coding, and reimbursement professionals with respect to their specific facts, jurisdiction, payer contracts, and circumstances before acting on any information in this guide.

3. Independent clinical judgment governs all patient care

All decisions regarding patient evaluation, diagnosis, treatment selection, procedure selection, patient selection, anesthesia planning, site of service, and discharge are the exclusive responsibility of the treating licensed clinician exercising independent professional judgment for the individual patient. This guide does not, and cannot, account for any individual patient's clinical presentation, comorbidities, preferences, or circumstances. No content in this guide should be permitted to influence a clinical decision away from what the treating clinician judges to be in the patient's best interest.

4. Coverage, coding, and payment information is time-limited and may be superseded

National Coverage Determinations, Local Coverage Determinations, Local Coverage Articles, CMS manuals, transmittals, program instructions, demonstration and model parameters, commercial medical policies, utilization management vendor criteria, code sets, code descriptors, payment indicators, covered procedure lists, conversion factors, and quality reporting requirements all change frequently, are revised on differing cycles, may be applied differently by different contractors and jurisdictions, and may be amended, corrected, suspended, delayed, or withdrawn without notice.

All statements in this guide reflect publicly available authoritative sources as understood on the publication date stated in the Document History section. They may have been superseded by the time you read this. The reader is solely responsible for verifying every requirement against the primary source and the payer policy actually in effect on the applicable date of service. Where this guide and a primary source conflict, the primary source governs.

5. No guarantee of authorization, coverage, payment, or outcome

GoHealthcare Practice Solutions makes no representation, warranty, prediction, or guarantee that following any recommendation, checklist, template, workflow, or strategy described in this guide will result in prior authorization approval, affirmation, coverage, payment, reimbursement at any particular level, a successful appeal, avoidance of a peer-to-peer review, avoidance of audit or medical review, or any other outcome. Authorization is not a guarantee of payment. Payment is subject to eligibility, benefit design and limits, network status, coding accuracy, timely filing, medical necessity, contract terms, and all other applicable requirements.

6. Site-of-service and utilization content

This guide describes differences among care settings, including differences in coverage rules, prior authorization requirements, payment systems, and administrative burden. This descriptive content is provided so that operational teams can execute correctly in whichever setting the treating clinician selects.

It is not, and must not be construed as, guidance to select or steer a site of service, a procedure, a code, or a patient population for economic reasons, for the purpose of avoiding prior authorization or utilization review, or for any purpose other than the clinical appropriateness and safety of the individual patient. Site-of-service selection must be driven by clinical appropriateness, patient safety, and applicable regulatory and accreditation requirements. Patterns of setting, procedure, or coding selection that are not clinically grounded may implicate the Federal Anti-Kickback Statute, the physician self-referral law, the False Claims Act, the Civil Monetary Penalties Law, beneficiary inducement prohibitions, state corporate practice and fee-splitting laws, state insurance law, and payer contract terms. Readers should obtain legal counsel before adopting any practice that could be characterized as steering.

7. Compliance and program integrity remain the reader's responsibility

Nothing in this guide should be interpreted as encouraging, endorsing, or excusing the submission of any claim, code, modifier, diagnosis, or authorization request that is not fully supported by the contemporaneous medical record and by the service actually furnished. Documentation must reflect the care that was delivered. Coding must reflect the documentation. Any authorization request or claim submitted under a provider's identifier is that provider's representation, regardless of who prepared it and regardless of whether any template, tool, or automation was used in its preparation.

Each organization is solely responsible for its own compliance program, coding and billing accuracy, medical record integrity, licensure and accreditation obligations, privacy and security obligations, and adherence to all applicable federal, state, and local law and to all applicable payer contract terms.

8. Intellectual property and third-party content

• CPT® is a registered trademark of the American Medical Association. CPT® is copyright of the American Medical Association. All rights reserved. Any CPT® code references in this guide are provided for educational identification only and any descriptor language is paraphrased. This guide does not convey any license to use CPT® content. Users must obtain a license directly from the American

Medical Association. Website: https://www.ama-assn.org • HCPCS Level II codes and ICD-10-CM codes are maintained by the Centers for Medicare & Medicaid Services, the National Center for Health Statistics, and other responsible authorities. Code references are educational and are not a substitute for the official code sets and official coding guidelines. • Commercial payer medical policies and utilization management vendor clinical criteria - including but not limited to those of eviCore, Carelon Medical Benefits Management, Cohere Health, Evolent, TurningPoint Healthcare Solutions, UnitedHealthcare, Aetna, Cigna Healthcare, Humana, Elevance Health, and Blue Cross Blue Shield licensees - are the proprietary property of their respective owners and may be subject to their own terms of use. This guide synthesizes and summarizes requirements at a general operational level and does not reproduce, republish, or substitute for those materials. Readers must consult the current policy or criteria document directly, under whatever license or terms of access apply to them. • All other trademarks, service marks, product names, device names, and organization names referenced in this guide are the property of their respective owners and are used for identification purposes only.

9. No endorsement

References to any payer, health plan, utilization management vendor, device or implant manufacturer, accrediting organization, professional society, publication, product, service, or organization are for identification and educational purposes only. They do not constitute an endorsement, recommendation, certification, or warranty by GoHealthcare Practice Solutions, and they do not imply any affiliation, sponsorship, partnership, or relationship with, or approval by, any such entity.

10. Third-party websites and links

This guide includes website addresses for authoritative primary sources as a convenience. GoHealthcare Practice Solutions does not control those sites and is not responsible for their content, availability, accuracy, currency, or terms of use. Inclusion of an address does not constitute endorsement of the site or its operator. Addresses may change or cease to function after publication.

11. Case studies, examples, templates, and checklists

All case studies, scenarios, examples, and quantitative illustrations in this guide are original composite educational constructions. They do not describe, and are not derived from, any actual patient, clinician, facility, health plan, or organization. Any resemblance to an actual person or entity is unintended and coincidental. No protected health information is contained in this guide.

Any checklist, template, workflow, matrix, or framework offered in this guide is a starting point requiring adaptation to the reader's own setting, payer mix, contracts, state law, accreditation standards, and clinical program. It should be reviewed and approved by the reader's own clinical, compliance, and legal leadership before adoption.

12. Preparation, verification status, and known limitations

This guide was prepared using publicly available authoritative sources. It was prepared without live access to proprietary payer policy databases, licensed code set databases, claims adjudication systems, or subscription clinical criteria platforms. Notwithstanding the verification performed, the reader should assume the possibility of error, omission, ambiguity, or subsequent supersession, and should independently verify any point on which the reader intends to rely. The verification and review status of this specific guide is recorded in the Document History section and should be consulted before operational use.

13. No warranty

This guide is provided "as is" and "as available," without warranty of any kind, whether express, implied, or statutory, including without limitation any implied warranty of accuracy, completeness, currency, reliability, title, non-infringement, merchantability, or fitness for a particular purpose. GoHealthcare Practice Solutions does not warrant that the information in this guide is accurate, complete, current, or applicable to any particular circumstance.

14. Limitation of liability

To the fullest extent permitted by applicable law, neither GoHealthcare Practice Solutions nor its officers, directors, members, employees, contractors, agents, or the author shall be liable for any direct, indirect, incidental, consequential, special, exemplary, or punitive damages, or for any loss of revenue, profit, reimbursement, data, goodwill, or business opportunity, or for any claim denial, recoupment, penalty, sanction, audit finding, or regulatory action, arising out of or in connection with the use of, reliance on, or inability to use this guide, whether based in contract, tort, negligence, strict liability, or any other theory, and whether or not advised of the possibility of such damages.

15. Copyright and permitted use

© 2026 GoHealthcare Practice Solutions. All rights reserved. GoHealthcare MSK Specialty Procedure Library™ and the GoHealthcare Clinical Procedure Guide Standard™ are marks of GoHealthcare Practice Solutions. This guide may be read, printed, and shared internally within a healthcare organization for its own educational and operational purposes, provided it is reproduced in full, without alteration, and with all attribution and this disclaimer intact. It may not be resold, relabeled, incorporated into a commercial product or training program, or republished externally without prior written permission.

16. Corrections and feedback

GoHealthcare Practice Solutions welcomes correction. If you identify an error, an omission, or a superseded requirement in this guide, please contact us so that it can be evaluated and addressed in a subsequent version. Website: https://www.gohealthcarellc.com

In Short

Summary. Verify everything against the primary source and the payer policy in effect on the date of service. Let clinical judgment govern patient care and site of service. Document what was actually done. Obtain your own legal and compliance advice. This guide informs your process; it does not assume your risk.

GoHealthcare Practice Solutions is a national Musculoskeletal Specialty Management Services Organization supporting Pain Management, Orthopedic Surgery, Spine Surgery, Neurosurgery, Neuromodulation, and Ambulatory Surgery Centers. Website: https://www.gohealthcarellc.com

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Developed by

Pinky Maniri

MSc, BSc, CRCR, CSAPM, CSPPM, CSBI, CSPR, CSAF, Certified in Healthcare A.I. Governance

Founder and Chief Executive Officer, GoHealthcare Practice Solutions

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