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GoHealthcare MSK Specialty Procedure Library™ | Ambulatory Surgery Center Operations

Observation versus Outpatient

Length of Stay, Extended Recovery, the Two-Midnight Framework, and Patient Status Across the ASC and Hospital Settings

An executive and operational reference for ASC expected-duration requirements, extended recovery, hospital observation and inpatient status, the two-midnight framework, case selection, transfer decisions, documentation, and payment consequences.

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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.

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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. The Regulatory Architecture of ASC Length of Stay
4. When Extended Recovery Is Contemplated
5. Case Selection Under the 2026 Physician Considerations
6. When the ASC Is the Wrong Setting
7. Pre-Service Planning for Length of Stay
8. Documenting the Expected Duration Judgment

Guide Sections 9-16

9. Clinical Assessment Supporting Setting Decisions
10. Medical Necessity and Setting
11. Medicare: The 24-Hour Standard and the Midnight Criterion
12. Observation, Inpatient Status, and the Two-Midnight Framework
13. Length-of-Stay Decision Workflow
14. Common Failures and Denials
15. Transfer, Unplanned Admission, and Post-Event Response
16. Coding and Billing Overview

Guide Sections 17-24

17. Status Determination and Its Payment Consequences
18. Observation Services and Why They Are Not Available in an ASC
19. Diagnosis Documentation Relevant to Setting and Duration
20. Notices, Condition Codes, and Status Mechanisms
21. Length-of-Stay and Setting Checklist
22. Setting and Status Comparison
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

Two questions sit behind almost every difficult case selection conversation in a musculoskeletal ambulatory surgery center. How long is this patient going to be here? And if the answer turns out to be longer than expected, what happens? This guide addresses both, along with the related hospital-side question of observation versus inpatient status that governs where a case goes when it does not go to the ASC.

The subject is unusually confused in practice, for three reasons. The federal framework is distributed across several regulations that were written at different times and use different language. State law diverges from the federal standard, permissively and materially, in a growing number of states. And the CY 2026 rulemaking changed the operative regulatory text in a way that has not yet reached most of the guidance in circulation.

What changed on January 1, 2026

The ASC Covered Procedures List criteria at 42 CFR 416.166 were restructured. Through December 31, 2025, a covered surgical procedure had to satisfy a general standard that included the requirement that standard medical practice dictates the beneficiary would not typically be expected to require active medical monitoring and care at midnight following the procedure. That midnight requirement was a categorical gate on which procedures could be added to the list at all.

Effective January 1, 2026, that language no longer appears in the coverage criteria. 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, not reportable only with an unlisted surgical procedure code, and not otherwise excluded. The midnight language reappears at 42 CFR 416.166(d), a new paragraph titled physician considerations, as one of several safety factors a physician should consider as to a specific beneficiary.

The midnight standard became a judgment, not a gate

This is the single most consequential change in this guide's subject matter, and it is consistent with the pattern visible across the CY 2026 rule and the 2019 history and physical amendment: CMS is converting categorical determinations into individualized clinical judgments and, with them, into documentation obligations.

Under the prior framework, a procedure likely to require monitoring at midnight was excluded from the list, and the facility never faced the question. Under the current framework, the procedure may be on the list, and the physician is expected to consider whether this beneficiary would require monitoring at midnight. The regulatory guardrail has been replaced by a record of judgment.

Critically, this did not change how long a patient may remain in an ASC. The definition at 42 CFR 416.2 is unchanged: an ASC operates 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. What changed is which procedures may be on the list and who decides. Facilities that read the criteria change as a relaxation of the length-of-stay standard will misread it.

A correction to Guide B04-01

Guide B04-01, Section 3 cited 42 CFR 416.65 for the proposition that covered surgical procedures have historically been characterized as generally requiring a post-operative recovery room or short-term, non-overnight convalescent room. That citation was hedged as historical, and the hedge was correct but insufficiently clear. 42 CFR 416.65 by its own terms applies only to services furnished before January 1, 2008. It is not current authority for services furnished today, and the non-overnight convalescent room language it contains should not be cited as a current standard. Guide B04-01 was corrected and reissued as version 1.1 on the publication date of this guide; its Section 3 now cites the current criteria at 42 CFR 416.166(b)(2) and the physician considerations at 42 CFR 416.166(d).

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02

Evidence at a Glance

Domain	Current position (2026)
ASC definition and expected duration	42 CFR 416.2. An ASC 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. Unchanged.
ASC covered procedure criteria, through December 31, 2025	42 CFR 416.166(b)(1) included the requirement that standard medical practice dictates the beneficiary would not typically be expected to require active medical monitoring and care at midnight following the procedure, subject to eight general exclusions at 416.166(c).
ASC covered procedure criteria, effective January 1, 2026	42 CFR 416.166(b)(2). Separately paid under the OPPS; not designated as requiring inpatient care under 42 CFR 419.22(n); not reportable only with a CPT® unlisted surgical procedure code; not otherwise excluded under 42 CFR 411.15. The midnight criterion is no longer a coverage criterion.
Physician considerations	New 42 CFR 416.166(d), effective January 1, 2026. Physicians should consider enumerated safety factors as to a specific beneficiary, including whether the procedure would not typically be expected to require active medical monitoring and care at midnight, and the five factors formerly operating as categorical exclusions.
Pre-2008 authority	42 CFR 416.65 applies only to services furnished before January 1, 2008. Its short-term, non-overnight convalescent room language is not current authority.
Overnight stays	CMS survey and certification guidance 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; facilities should confirm the current position against current Appendix L guidance and with their MAC.
State law	Diverges materially and permissively. Several states expressly authorize extended recovery of 23 hours 59 minutes, 24 hours, 48 hours, or longer, frequently under a separate license or approval and with prescribed conditions. State authorization does not displace the federal standard for a Medicare beneficiary.
Observation services	A hospital outpatient service. ASCs do not furnish observation services and cannot bill them. An ASC has outpatients only; it has no status to change.
Two-midnight framework	42 CFR 412.3. Governs the hospital inpatient admission decision, not the ASC. Generally, inpatient admission is appropriate where the physician expects the patient to require hospital care spanning at least two midnights.
IPO medical review exemption	Continued for CY 2026 and subsequent years. Procedures removed from the Inpatient Only list on or after January 1, 2021 are exempt from site-of-service claim denials, contractor referrals to the Recovery Audit Contractor for two-midnight noncompliance, and RAC patient status reviews, until the Secretary determines the procedure is more commonly performed in the outpatient setting. 42 CFR 412.3(d)(2) was revised for clarity.
Exemption scope	The exemption does not override the underlying two-midnight requirements. Physicians must still document inpatient admission decisions under existing criteria, and contractors may still review for medical necessity.
Inpatient Only list	Being eliminated over a three-year transition beginning CY 2026, with 285 mostly musculoskeletal procedures removed in the first year. Removal from the list does not require outpatient performance; 42 CFR 416.75 confirms that inclusion as an ASC covered procedure does not preclude inpatient coverage.

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03

The Regulatory Architecture of ASC Length of Stay

Four distinct questions are frequently collapsed into one. Separating them resolves most of the confusion in this area.

Question	Governing authority	Answer
May this procedure be performed in an ASC and paid by Medicare?	42 CFR 416.166(b)(2), effective January 1, 2026	Only if it is on the ASC Covered Procedures List, which now turns on separate OPPS payment and the three retained exclusions.
Should this procedure be performed in an ASC for this patient?	42 CFR 416.166(d), effective January 1, 2026, plus facility case selection policy	A physician judgment informed by enumerated safety considerations, made individually and documented.
How long may this patient remain in the ASC?	42 CFR 416.2, plus state licensure law	The federal definition turns on expected duration not exceeding 24 hours following admission. State law may impose a shorter or a differently structured limit and may separately authorize extended recovery.
What status does this patient have?	Not applicable in the ASC	An ASC patient is an outpatient. There is no observation status, no inpatient status, and no status change mechanism in the ASC setting.

The expected duration standard

The operative word in 42 CFR 416.2 is expected. The standard is applied prospectively at case selection, not retrospectively at discharge. A case reasonably expected to conclude within the window does not become non-compliant because an unanticipated complication extended recovery. A case never realistically expected to conclude within the window does not become compliant because the patient happened to recover quickly.

This has a direct documentation consequence. What the facility must be able to demonstrate is the reasonableness of the expectation formed before the case, not the outcome after it. That is a record created at case selection, and it is precisely the record most facilities do not create.

The 2026 restructuring in detail

	Through December 31, 2025	Effective January 1, 2026
Structure	General standards at 416.166(b)(1), subject to eight general exclusions at 416.166(c).	Requirements at 416.166(b)(2). No corresponding exclusion paragraph applies.
Separate OPPS payment	Required.	Required.
Significant safety risk	Procedure must not be expected to pose a significant safety risk to a Medicare beneficiary when performed in an ASC.	Moved to physician considerations at 416.166(d)(1).
Midnight monitoring	Standard medical practice must dictate that the beneficiary would not typically be expected to require active medical monitoring and care at midnight following the procedure.	Moved to physician considerations at 416.166(d)(2).
Extensive blood loss; major or prolonged invasion of body cavities; direct involvement of major blood vessels; generally emergent or life-threatening; commonly requires systemic thrombolytic therapy	Five categorical exclusions at 416.166(c)(1) through (c)(5).	Moved to physician considerations at 416.166(d)(3) through (d)(7).
Designated as requiring inpatient care	Exclusion at 416.166(c)(6).	Retained as a requirement at 416.166(b)(2)(ii)(A).
Unlisted surgical procedure code only	Exclusion at 416.166(c)(7).	Retained as a requirement at 416.166(b)(2)(ii)(B).
Otherwise excluded under 42 CFR 411.15	Exclusion at 416.166(c)(8).	Retained as a requirement at 416.166(b)(2)(ii)(C).

A drafting feature worth understanding before writing policy

The new physician considerations paragraph mixes factors that point in opposite directions without a consistent framing. Subparagraphs (d)(1) and (d)(2) are expressed as reassuring attributes - the procedure is not expected to pose a significant safety risk, and the beneficiary would not typically be expected to require monitoring at midnight. Subparagraphs (d)(3) through (d)(7) are expressed as concerning attributes - the procedure generally results in extensive blood loss, requires major or prolonged invasion of body cavities, and so on.

Read literally as a single list of things the procedure is, the paragraph is internally inconsistent. Read as a list of safety factors a physician should weigh for the individual patient - which is how the paragraph is titled and how CMS described the policy - it is coherent.

The practical implication is that facilities should build case selection policy around the substance of the seven factors as considerations to be weighed and documented, rather than attempting to apply the paragraph as a literal checklist. Facilities in doubt about how their MAC reads it should ask, and should document the answer.

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04

When Extended Recovery Is Contemplated

Extended recovery arises in two very different postures, and conflating them is the source of most compliance exposure in this area.

Posture	Description	Treatment
Unanticipated prolonged recovery	A case reasonably expected to conclude within the window in which the patient's recovery is slower than anticipated.	Not a compliance problem in itself. Manage clinically, document the clinical course and the decision-making, and either complete discharge or transfer. Feed the event into case selection review.
Planned extended stay	A case selected with the expectation that the patient will remain beyond the ordinary same-day period.	The compliance question. Permissible only where both the federal expected-duration standard and applicable state law allow it, and where the facility holds any state authorization required.

What a defensible extended recovery program requires

Where a facility operates in a state that authorizes extended recovery and intends to use it, the following are the recurring elements of state authorizing frameworks and of a defensible program. State requirements vary substantially and must be read directly.

• State licensure or approval specific to extended recovery, obtained before the service is offered
• Any state-imposed operating history requirement satisfied, which in some states requires a period of prior operation before applying

• The maximum permitted duration identified precisely, which in various states is expressed as 23 hours 59 minutes, 24 hours, 48 hours, or longer
• The point from which the period runs identified - admission, procedure end, or recovery admission - because states differ
• Written admission criteria for the extended recovery area, applied and documented
• Pre-surgical screening and a second screening before admission to the extended recovery area
• A designated decision-maker where candidacy is in question, which several states specify
• Physical environment meeting state requirements for overnight accommodation
• Staffing and nurse-to-patient ratio meeting state requirements for the overnight period

• A written transfer agreement and a documented transfer pathway
• Admitting privileges arrangements where the state requires them
• Discharge criteria for the extended recovery area, and a defined action where the patient cannot be discharged within the permitted period
• Documentation of the expected duration judgment formed before the case

State authorization does not displace the federal standard

This is the point most frequently misunderstood, and the misunderstanding is expensive.

A state may authorize an ASC to keep patients for 48 hours. That authorization governs the facility's state licensure. It does not amend 42 CFR 416.2, and it does not create Medicare payment for a stay inconsistent with the federal definition of an ASC. For a Medicare beneficiary, the federal standard applies regardless of how permissive state law is.

Multi-state ASC organizations therefore cannot operate a single national extended recovery policy, and cannot apply a state's permissive standard uniformly across their payer mix. The practical structure is a state-specific policy that also distinguishes by payer, with the Medicare beneficiary held to the federal standard.

Given the 2026 amendments and the age of some of the interpretive guidance in this area, facilities contemplating an extended recovery program should confirm the current federal position with their Medicare Administrative Contractor and obtain counsel, rather than relying on secondary summaries including this one.

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05

Case Selection Under the 2026 Physician Considerations

With five categorical exclusions converted into physician considerations, case selection is where the regulatory change actually lands. The considerations at 42 CFR 416.166(d) are the natural spine for a facility's case selection policy.

Consideration	What to assess for the individual patient	Documentation
Significant safety risk in the ASC setting	Whether this patient, with this comorbidity profile and this procedure, can be safely managed with the facility's staffing, equipment, and monitoring capability.	The physician's assessment, with the specific factors weighed.
Active medical monitoring and care at midnight	Whether this patient would be expected to require active monitoring and care at midnight following the procedure. This is the former categorical gate applied individually.	An explicit statement of the expected recovery trajectory and the basis for it.
Extensive blood loss	Anticipated blood loss for this procedure in this patient, transfusion probability, and the facility's capability.	Quantified anticipated blood loss rather than a general characterization.
Major or prolonged invasion of body cavities	The approach and expected duration, and whether the facility is equipped for it.	Anticipated operative duration and approach documented.
Direct involvement of major blood vessels	Proximity to and manipulation of major vessels, and the facility's capacity to manage vascular injury.	Assessment of vascular risk specific to the planned approach.
Emergent or life-threatening nature	Whether the indication is elective. Emergent presentations are generally inconsistent with the ASC setting.	Elective status confirmed.
Systemic thrombolytic therapy	Whether the procedure commonly requires it and whether the facility can manage the consequences.	Assessment documented where relevant.

Patient factors bearing on expected duration

The considerations above are procedure-oriented. Expected duration is equally driven by patient factors, which the facility's case selection policy should address alongside them. These are developed in Guide B04-01, Section 4, and

summarized here as they bear specifically on length of stay.

• Cardiopulmonary status, including any condition likely to require prolonged monitoring.
• Obstructive sleep apnea severity and adherence to therapy, which bears directly on post-anesthesia monitoring duration.

• Anesthesia plan and anticipated recovery profile, including regional or neuraxial technique affecting ambulation and voiding.
• Anticipated postoperative pain control requirements and the route by which they will be met.
• Anticoagulation management and bleeding risk.
• Baseline functional status, mobility, and the realistic time to meet ambulation-dependent discharge criteria.
• Nausea and vomiting risk, which is a common driver of prolonged recovery.
• Social factors: escort availability, distance from the facility, distance from emergency care, and the safety of the discharge environment.
• Procedure start time relative to the facility's operating hours and staffing.

That last factor is more consequential than it appears. A case reasonably expected to conclude within the window if performed in the morning may not be if scheduled late in the day. The expected duration judgment is not a property of the procedure alone; it is a property of the procedure, the patient, and the schedule position together.

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06

When the ASC Is the Wrong Setting

Indicator	Why it points away from the ASC
Anticipated need for care beyond the expected duration standard	The threshold question under 42 CFR 416.2. If the honest expectation exceeds the window, the ASC is not the correct setting for a Medicare beneficiary.
Anticipated need for monitoring or nursing care exceeding facility capability	Capability, not merely duration. A facility that can keep a patient but cannot monitor them appropriately has not solved the problem.
Anesthesia assessment identifying a requirement for hospital-level resources	The most persuasive single indicator, and the one payers weigh most heavily in site-of-service review.
Anticipated transfusion or significant blood loss	Now a physician consideration rather than a categorical exclusion, which makes documenting the assessment more important rather than less.
Active, unstable, or recently decompensated comorbidity	Distinguished from chronic controlled disease. Recency and stability matter more than the diagnosis list.
No responsible adult escort and no clinically appropriate exemption	Discharge cannot be completed in compliance with 42 CFR 416.52(c)(3).
Unsafe discharge environment or prohibitive distance from emergency care	Increasingly scrutinized by payers as insufficient alone; strongest when paired with a clinical factor.
Late schedule position for a case with a long expected recovery	The interaction of case length and start time, which is a facility-controllable factor and should be managed at scheduling.

Where the ASC is the wrong setting, the alternatives are the hospital outpatient department with observation available if needed, or inpatient admission. Which of those applies is governed by the two-midnight framework, addressed in Section 12.

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07

Pre-Service Planning for Length of Stay

Element	Practice
Expected duration determination	Made explicitly at case selection by the operating physician, informed by the physician considerations and the patient factors, and recorded rather than assumed.
Screening sequence	Clinical screening precedes or runs concurrently with authorization so the site submitted is the site actually intended. Screening after authorization produces rework and rescheduling.
Anesthesia review	A defined pathway with authority to redirect a case to a hospital setting, exercised before the day of surgery wherever possible.
Schedule position	Cases with longer expected recovery scheduled earlier in the day, with the facility's operating hours and staffing treated as a constraint rather than a variable.
Discharge planning	Escort confirmed, transport arranged, and the discharge environment assessed before the day of surgery, not at the point of discharge.
Transfer readiness	Transfer agreement current, pathway documented, and the receiving facility's expectations understood by the clinical team.
Payer verification	Site of service authorized matches the site intended. Where the case may need to move, the consequences for authorization are understood in advance.
Exception documentation	Where a case deviates from the facility's case selection policy, the deviation and its rationale documented rather than silently accommodated.

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08

Documenting the Expected Duration Judgment

With the categorical criteria converted to physician considerations, the documented exercise of judgment is what a facility will have to show. This is a small record that almost no facility currently creates, and it is the direct compliance consequence of the 2026 change.

What the case selection record should contain

• The procedure planned, with anatomic site, level, and laterality
• The patient's relevant comorbidity profile, stated rather than incorporated by reference
• The anesthesia plan and its expected recovery profile
• An explicit statement of the expected duration of services and the basis for that expectation
• The physician's consideration of the applicable safety factors at 42 CFR 416.166(d), addressed in substance
• Confirmation that the facility's staffing, equipment, and monitoring capability match the anticipated requirement
• Discharge plan including escort, transport, and destination
• Where the facility's case selection policy has a threshold the case does not meet, the exception and its rationale
• Attribution to the physician making the judgment, dated

Where the record lives

This record can live in the pre-operative note, in a case selection attestation, or in a structured field in the scheduling record. What matters is that it exists before the case, is attributable, and is retrievable. Facilities that rely on the operative report to establish the reasonableness of a pre-operative judgment are relying on a document written after the outcome was known, which is exactly the weakness a reviewer will identify.

GoHealthcare Clinical Insight: document the expectation, not the outcome

The federal standard turns on expected duration. Every audit and survey question in this area therefore reduces to the same inquiry: was the expectation reasonable when it was formed?

A facility with a documented pre-operative expected duration judgment can answer that question for any case, including cases that went badly. A facility without one is left arguing from the outcome, which works when the outcome was good and fails precisely when it matters.

The record does not need to be long. A few sentences from the operating physician, before the case, stating the expected recovery trajectory and the basis for it, converts an unanswerable question into an answerable one. In the facilities where we have implemented this, the most common reaction is surprise that it was never there.

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09

Clinical Assessment Supporting Setting Decisions

Assessment	Contribution to the setting decision
Anesthesia pre-operative evaluation	The most influential single input. An anesthesia assessment identifying a specific resource requirement carries substantially more weight with payers and reviewers than a physician assertion of complexity.
ASA Physical Status classification	Used in case selection thresholds and in site-of-service argument. Note the definitions were revised October 15, 2025; see Guide B04-05.
Obstructive sleep apnea screening	Directly relevant to expected post-anesthesia monitoring duration and a common driver of prolonged recovery.
Cardiac and pulmonary evaluation	Where indicated, the specialist's assessment of perioperative risk and monitoring requirement.
Functional and mobility assessment	Predicts time to meet ambulation-dependent discharge criteria, which is a frequent and underestimated driver of prolonged stay in joint and spine cases.
Imaging and procedure complexity assessment	Informs anticipated operative duration, blood loss, and the physician considerations at 416.166(d).
Social assessment	Escort, transport, home environment, and distance from emergency care.

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10

Medical Necessity and Setting

Setting and status generate three distinct medical necessity questions, which different payers ask in different combinations.

Question	Who asks it	What answers it
Is the procedure medically necessary?	All payers.	The applicable coverage policy criteria, addressed in Guide B04-01 and the procedure guides.
Is the ASC an appropriate setting for this patient?	The facility, under 42 CFR 416.2 and 416.166(d); commercial payers under site-of-service policy.	The documented physician judgment on expected duration and safety considerations.
Is hospital-level care, and specifically inpatient admission, medically necessary?	Medicare under the two-midnight framework; commercial payers under their own criteria.	The physician's documented expectation of the required duration of hospital care and the clinical basis for it.

For an ASC the second question is the operative one, and it runs in the direction of the setting being requested. Where the ASC is requested, the argument is that the patient is appropriate for a freestanding setting with an expected duration

within the standard. Where the hospital outpatient department is requested for a procedure the payer expects in an ASC, the argument is a specific, documented clinical factor requiring hospital-level resources. Submitting the wrong argument for the setting requested is a self-inflicted denial.

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11

Medicare: The 24-Hour Standard and the Midnight Criterion

What 42 CFR 416.2 does and does not say

The definition establishes what an ASC is. It is a distinct entity operating exclusively for the purpose of providing surgical services to patients not requiring hospitalization, in which the expected duration of services would not exceed 24 hours following an admission, with an agreement with CMS to participate in Medicare as an ASC, and meeting the Conditions for Coverage at 42 CFR Part 416 subparts B and C.

• It is a definitional standard, not a stopwatch. It addresses expected duration, not actual duration.
• It runs from admission, not from the end of the procedure.
• It does not authorize a 24-hour stay as a routine operating model; it defines the outer boundary of what an ASC is.
• It applies to the entity's operating character as well as to individual cases. An entity whose case mix routinely requires care approaching or exceeding the window is not operating as an ASC as defined.

The midnight criterion after January 1, 2026

The midnight language now appears at 42 CFR 416.166(d)(2) as a physician consideration rather than at 416.166(b) as a coverage criterion. Two points follow, and they pull in opposite directions.

Point	Implication
The list will contain more procedures that could require midnight monitoring	Procedures previously excluded from the ASC Covered Procedures List by the midnight criterion may now qualify, because the criterion no longer gates list inclusion. Facilities cannot infer from a procedure's presence on the list that it is unlikely to require overnight care in any given patient.
The judgment moved to the physician, and so did the record	Where a procedure could plausibly require monitoring at midnight, the physician is expected to consider that for the specific beneficiary. The facility's evidence that this occurred is the case selection documentation described in Section 8.
The length-of-stay standard did not change	42 CFR 416.2 is unchanged. A procedure being on the list does not authorize a stay inconsistent with the expected duration standard.
Interpretive guidance may lag	CMS survey and certification guidance stating that the regulations do not allow planned overnight recoveries in an ASC for Medicare beneficiaries predates these amendments. Facilities should verify the current position against current Appendix L guidance and with their MAC rather than assuming either continuity or change.

Removal from the Inpatient Only list is not a direction

A procedure removed from the Inpatient Only list becomes eligible for outpatient payment. It does not become required to be performed on an outpatient basis. CMS has been explicit that services removed from the list may still be furnished in an inpatient setting and may be paid under Part A where applicable inpatient criteria are met, and 42 CFR 416.75 separately confirms that inclusion of a procedure as an ASC covered surgical procedure does not preclude its coverage in an inpatient hospital setting.

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12

Observation, Inpatient Status, and the Two-Midnight Framework

This section addresses the hospital side. It is included because musculoskeletal organizations routinely operate or partner with hospital outpatient departments, because cases move between settings, and because the two-midnight framework is frequently and incorrectly invoked in discussions about ASC length of stay, where it has no application.

What observation is

Observation is a hospital outpatient service. A patient receiving observation services is an outpatient of the hospital, not an inpatient. Observation is used where the physician needs a period of assessment and treatment to determine whether inpatient admission is required or whether the patient can be discharged.

ASCs do not furnish observation services

This is categorical and is worth stating plainly because the term is used loosely in ASC operations. An ASC cannot bill observation services. There is no ASC observation status, no ASC observation payment, and no mechanism by which an ASC patient becomes an observation patient.

An ASC patient is an outpatient of the ASC for the entire encounter. Where the facility provides extended recovery under state authorization, that patient remains an ASC outpatient in extended recovery; the state authorization changes what the facility may do, not what the patient's Medicare status is.

Staff who describe an ASC extended recovery patient as being 'in observation' are using hospital vocabulary for an ASC situation. It is worth correcting, because the vocabulary carries assumptions about payment and status that do not transfer.

The two-midnight framework

Element	Description
Benchmark	Generally, inpatient admission is appropriate under Medicare Part A where the admitting physician expects the patient to require hospital care spanning at least two midnights.
Case-by-case exception	CMS has permitted flexibility for admissions not meeting the two-midnight benchmark to be payable under Part A on a case-by-case basis, based on the admitting physician's judgment and supporting documentation.
Inpatient Only list	Procedures on the list are payable under Part A when furnished on an inpatient basis, irrespective of expected length of stay. The list is being eliminated over a three-year transition beginning CY 2026.
Physician documentation	The admission decision rests on the physician's expectation and clinical judgment, documented in the record. The expectation, and the basis for it, is what is reviewed.
Medical review	Short-stay inpatient review responsibility and methodology have evolved; facilities should confirm current review arrangements.
Applicability to ASCs	None. The two-midnight framework governs the hospital inpatient admission decision. It does not apply to ASC length of stay and should not be invoked in ASC case selection discussion.

The IPO medical review exemption

In conjunction with Inpatient Only list removals, CMS established and has continued a policy exempting procedures removed from the list from certain medical review activities related to the two-midnight policy. For CY 2026 and subsequent years, procedures removed from the list on or after January 1, 2021 remain exempt from site-of-service claim denials, from Medicare review contractor referrals to the Recovery Audit Contractor for persistent noncompliance with the two-midnight rule, and from RAC reviews for patient status, until the Secretary determines the service is more

commonly performed for the Medicare population in the outpatient setting. CMS revised 42 CFR 412.3(d)(2) for clarity in the CY 2026 rule.

GoHealthcare Prior Authorization Insight: what the exemption does not do

The exemption is frequently over-read as a safe harbor for inpatient admission of any procedure removed from the Inpatient Only list. It is not.

• It exempts specified review activities relating to patient status. It does not override the underlying two-midnight requirements.
• Physicians must continue to document inpatient admission decisions under existing criteria. CMS said so expressly in the CY 2026 rule.
• Contractors may still deny claims on grounds other than the exempted patient status reviews, including medical necessity.
• It is time-limited by its own terms, ending when the Secretary determines the procedure is more commonly performed in the outpatient setting, with the first removal to be implemented through rulemaking.

For a musculoskeletal organization operating both an ASC and a hospital outpatient department, the exemption is genuinely valuable during the Inpatient Only list transition. It is not a reason to relax admission documentation, and organizations that treat it that way will be exposed when it lapses.

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13

Length-of-Stay Decision Workflow

Stage	Actions	Failure if skipped
1. Procedure eligibility	Confirm the procedure is on the current ASC Covered Procedures List for a Medicare beneficiary.	A scheduled Medicare case with no facility payment available.
2. Physician considerations	Physician weighs the 42 CFR 416.166(d) safety factors for this beneficiary and forms an expected duration judgment.	No record of the judgment the regulation now expects the physician to make.
3. Patient factor screening	Clinical screening against the facility's case selection policy, including factors bearing specifically on recovery duration.	Prolonged recovery and transfers that were foreseeable.
4. Anesthesia review	Anesthesia evaluation with authority to redirect, conducted before the day of surgery where possible.	A redirection decision made on the morning of surgery, when it is most disruptive and least well documented.
5. State and payer overlay	Confirm state licensure limits and any extended recovery authorization; confirm the authorized site of service.	A stay lawful in one state and not another, or a case at a site the payer did not authorize.
6. Schedule position	Place the case in the day consistent with its expected recovery and the facility's staffed hours.	An avoidable late-day prolonged recovery.
7. Documentation	Record the expected duration judgment, the considerations weighed, and any policy exception.	An unanswerable question at survey or audit.
8. Intraoperative and recovery monitoring	Track recovery against the expected trajectory; escalate early where it diverges.	A decision at closing time rather than at the point the divergence became apparent.
9. Divergence decision	Where recovery exceeds expectation, decide deliberately between continued recovery within the permitted period and transfer, and document the decision.	A default to whichever option is operationally easiest at the moment.
10. Transfer execution	Execute the transfer pathway with documentation of indication, timing, mode, and report given.	An ASCQR reported event with inadequate supporting documentation.

Stage	Actions	Failure if skipped
11. Retrospective review	Review prolonged recoveries, transfers, and unplanned admissions through QAPI, feeding case selection criteria.	The same foreseeable case recurring indefinitely.

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14

Common Failures and Denials

Failure	Category	Root cause
No documented expected duration judgment	Compliance	The regulation shifted the judgment to the physician and no one added the record.
Case selection policy still written to the pre-2026 exclusion criteria	Compliance	Policy not revisited after the January 1, 2026 restructuring.
Planned extended stay without state authorization	Licensure	State requirements assumed rather than read, or a multi-state policy applied uniformly.
State authorization treated as displacing the federal standard	Compliance	The two frameworks conflated for Medicare beneficiaries.
Citing 42 CFR 416.65 as current authority	Accuracy	The section applies only to services furnished before January 1, 2008. Widely cited regardless.
Describing an ASC extended recovery patient as being in observation	Accuracy	Hospital vocabulary imported into an ASC setting where the status does not exist.
Invoking the two-midnight rule in ASC case selection	Accuracy	The framework governs hospital inpatient admission and has no ASC application.
Over-reading the IPO medical review exemption	Compliance	Treating an exemption from specified review activities as a safe harbor for the admission decision.
Assuming CPL presence implies short recovery	Case selection	The midnight criterion no longer gates list inclusion.
Site of service billed differs from site authorized	Revenue	Case moved between settings without re-authorization. See Guide B04-01.
Transfer executed without adequate documentation	Quality and compliance	No defined transfer documentation pathway.
Prolonged recoveries not reviewed retrospectively	Governance	Events absorbed operationally rather than fed into case selection criteria.

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Transfer, Unplanned Admission, and Post-Event Response

Transfer documentation

• The clinical indication for transfer, stated specifically
• The time the decision was made and the time of departure
• The mode of transport and the level of care during transport
• The receiving facility and the accepting physician
• The report given, including what information was transferred
• The patient's condition at the time of transfer
• Notification of family or responsible adult
• The transfer agreement invoked

After the event

• Every transfer and unplanned admission should be reviewed through the quality assessment and performance improvement program under 42 CFR 416.43.

• The review should ask specifically whether the event was foreseeable at case selection, because that is the question that improves future selection.
• Where a pattern emerges by procedure, surgeon, patient characteristic, or schedule position, the case selection policy should change rather than the event being logged and closed.

• Transfer rate is an ASCQR reported measure and a governance indicator; it should be visible to the governing body alongside volume.
• Where the event suggests the facility's expected duration judgments are systematically optimistic, that is a case selection finding rather than an individual clinical one.

The honest retrospective question

The question worth asking after a prolonged recovery or transfer is not whether the outcome was acceptable. It usually was. The question is whether the expectation formed before the case was reasonable. A facility whose transfers consistently involve cases that in hindsight were predictable has a case selection problem, and the regulatory framework now places that problem squarely on the documented physician judgment.

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16

Coding and Billing Overview

• The ASC bills a facility claim on the professional claim format with place of service 24. There is no ASC observation code, no ASC status change mechanism, and no additional facility payment for extended recovery under the Medicare ASC payment system.
• Extended recovery furnished under state authorization does not create a separate Medicare payment. Where a commercial contract provides for it, the terms are contractual and must be confirmed.
• Where a case is moved to the hospital outpatient department or the patient is admitted, the billing entity, claim format, payment system, and authorization all change. See Guide B04-01.
• Where a procedure is discontinued, modifier 73 or 74 applies depending on whether anesthesia had been administered.
• Place of service must match the site where the case was actually performed and the site authorized.
• Hospital observation and inpatient billing mechanics are outside the scope of this guide and are governed by hospital billing rules.

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Status Determination and Its Payment Consequences

Setting and status	Payment system	Claim format	Status change available
ASC outpatient	ASC payment system	Professional	No. There is no other status.
Hospital outpatient	OPPS	Institutional	Observation services available as an outpatient service.
Hospital outpatient with observation	OPPS	Institutional	Patient remains an outpatient. Admission decision may follow.
Hospital inpatient	IPPS	Institutional	Status change mechanisms exist on the hospital side, subject to their own requirements.

The payment differences across these rows are large, and they are the reason patient status is reviewed at all. For an ASC the practical significance is narrower than it first appears: the ASC has one status and one payment system, and the

decision that matters is made before the case, at case selection, rather than during it.

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Observation Services and Why They Are Not Available in an ASC

Attribute	Hospital outpatient department	Ambulatory surgery center
Observation services	Available as an outpatient service.	Not available. Cannot be billed.
Patient status options	Outpatient, outpatient with observation, or inpatient.	Outpatient only.
Status change mechanism	Exists, subject to hospital requirements.	None.
Beneficiary notice for extended outpatient stay	Notice requirements apply to hospital observation patients meeting specified conditions.	Not applicable; the ASC has no observation service.
Length of stay governance	Two-midnight framework governs inpatient admission; observation duration governed by clinical need and hospital policy.	42 CFR 416.2 expected duration standard, plus state licensure limits.
Payment for the extended period	Observation is payable under OPPS subject to applicable requirements.	No separate Medicare payment. Extended recovery under state authorization is not a Medicare payable service.

The asymmetry in the last row is the economic reality behind most extended recovery decisions. A hospital outpatient department that keeps a patient longer has a payable service available to it. An ASC that keeps a patient longer under state authorization generally does not, under Medicare. Extended recovery in an ASC is therefore a clinical and access proposition rather than a revenue one, and facilities evaluating it should model it that way.

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Diagnosis Documentation Relevant to Setting and Duration

Element	Requirement
Comorbidity supporting the setting judgment	Conditions bearing on expected duration should be documented in a codeable form rather than described only in anesthesia narrative.
Severity and control	Where the setting judgment turns on whether a condition is controlled, the record should reflect the control status rather than the diagnosis alone.
Complications and prolonged recovery	Where recovery was prolonged, the clinical reason should be documented, including as a diagnosis where one applies.
Transfer indication	The condition prompting transfer, documented specifically.
Consistency	Diagnosis consistent between the authorization, the operative record, the transfer documentation where applicable, and the claim.

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Notices, Condition Codes, and Status Mechanisms

The mechanisms in this section are hospital mechanisms. They are described so that musculoskeletal organizations operating across settings understand what exists where, and so that ASC staff do not attempt to apply them.

Mechanism	Setting	Function
Beneficiary notice for observation services	Hospital outpatient	Notice requirements apply to Medicare beneficiaries receiving observation services as outpatients under specified conditions, informing them of their outpatient status and its potential financial consequences. Requirements and timing should be confirmed against current CMS guidance.

Mechanism	Setting	Function
Condition codes for patient status change	Hospital	Mechanisms exist by which a hospital may change a patient's status under defined conditions, with utilization review involvement and specific documentation requirements. These are hospital billing mechanisms with their own rules.
Advance Beneficiary Notice of Non-coverage	ASC and other settings	Where a Medicare denial is anticipated for a service, notice must be issued in advance and the appropriate modifier applied. See Guides B04-04 and B04-05.
Discontinued procedure modifiers	ASC	Modifier 73 before anesthesia administration; modifier 74 after.
Place of service	All	POS 24 for the ASC; POS 22 on-campus and POS 19 off-campus hospital outpatient; POS 21 inpatient. Must match the site of service actually furnished and authorized.

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21

Length-of-Stay and Setting Checklist

Policy level

• Case selection policy rewritten to the current 42 CFR 416.166 structure, addressing the physician considerations at 416.166(d) in substance
• Expected duration judgment established as a required documented element
• State licensure limits identified for every state in which the organization operates
• Extended recovery authorization obtained where the facility offers it, with all state conditions satisfied
• Policy distinguishing state authorization from the federal standard for Medicare beneficiaries
• Transfer agreement current and transfer pathway documented
• Scheduling policy addressing case position relative to expected recovery and staffed hours
• Retrospective review of prolonged recoveries, transfers, and unplanned admissions through QAPI
• Governing body approval and dated annual review

Per case, before the day of surgery

• Procedure confirmed on the current ASC Covered Procedures List for Medicare beneficiaries
• Physician considerations weighed and expected duration judgment documented
• Patient factors bearing on recovery duration assessed
• Anesthesia review completed with redirect authority available
• Escort, transport, and discharge environment confirmed
• Site of service authorized matches the site intended
• Schedule position appropriate to expected recovery
• Any case selection policy exception documented with rationale

On the day and after

• Recovery tracked against the expected trajectory with early escalation on divergence
• Divergence decision made deliberately and documented
• Where extended recovery is used, state conditions satisfied and documented
• Where transfer occurs, full transfer documentation completed
• Discharge requirements under 42 CFR 416.52(c) met, including the physician-signed order and escort
• Event entered into QAPI review where prolonged recovery, transfer, or unplanned admission occurred

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Setting and Status Comparison

Dimension	ASC	Hospital outpatient	Hospital inpatient
Patient status	Outpatient only	Outpatient, with observation available	Inpatient
Governing length-of-stay standard	42 CFR 416.2 expected duration not exceeding 24 hours following admission, plus state law	Clinical need; observation duration governed by clinical judgment and hospital policy	Two-midnight framework at 42 CFR 412.3
Payment system	ASC payment system	OPPS	IPPS
Claim format	Professional	Institutional	Institutional
Place of service	24	22 on-campus; 19 off-campus	21
Overnight care	Not routinely; state authorization required where permitted at all, and does not displace the federal standard for Medicare beneficiaries	Available	Available
Payment for extended period	No separate Medicare payment	Observation payable under OPPS subject to requirements	Included in the inpatient payment
Medical review exposure on status	Not applicable; no status to review	Site-of-service and status review, subject to the IPO exemption where applicable	Two-midnight and patient status review, subject to the IPO exemption where applicable
Conditions	Conditions for Coverage, 42 CFR Part 416	Conditions of Participation, 42 CFR Part 482	Conditions of Participation, 42 CFR Part 482

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23

GoHealthcare Clinical Insights

Rewrite the case selection policy to the current regulation

Most ASC case selection policies were written against the five categorical exclusions that no longer exist as exclusions. Those policies are not wrong in substance - the underlying safety factors are the same factors - but they are structurally out of step with a regulation that now expects an individualized, documented physician judgment. The rewrite is straightforward and should be done deliberately rather than at the next survey.

Create the expected duration record

A few sentences from the operating physician, before the case, stating the expected recovery trajectory and its basis. This is the direct compliance consequence of the 2026 change and almost no facility currently produces it. It converts the central audit question from unanswerable to answerable.

Treat schedule position as a clinical variable

Expected duration is a property of procedure, patient, and schedule position together. A case that is comfortably within the window at seven in the morning may not be at three in the afternoon. Scheduling is one of the few genuinely controllable inputs to this problem and it is usually managed for throughput alone.

Separate state law from federal standard in the policy itself

Multi-state organizations should write the policy so that the two frameworks are visibly distinct: what state law permits this facility to do, and what the federal standard requires for a Medicare beneficiary. Policies that state only the more permissive of the two invite exactly the error that causes exposure.

Correct the vocabulary

An ASC has no observation status and no two-midnight question. Staff who use hospital vocabulary in the ASC are importing assumptions about payment and status that do not hold. This is worth correcting because the vocabulary shapes how people reason about the decision.

Ask the foreseeability question retrospectively

After every prolonged recovery and transfer, ask whether the event was foreseeable at case selection. This is a more useful question than whether the outcome was acceptable, and it is the question that improves the expected duration judgments the regulation now depends on.

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GoHealthcare Leadership Perspective

The guardrail became a judgment, and the judgment needs governance

The CY 2026 conversion of five categorical exclusions and the midnight criterion into physician considerations is a genuine expansion of clinical flexibility. It is also a transfer of accountability from CMS to the physician and, through the governing body's responsibility under 42 CFR 416.41, to the facility. A governing body that has not reviewed and approved the framework within which its physicians now exercise that judgment has not discharged that responsibility.

Extended recovery is an access proposition, not a revenue one

Under Medicare there is no separate payment for extended recovery in an ASC. Where a state authorizes it, the facility bears the cost of the overnight period - staffing, environment, and licensure - without corresponding Medicare revenue. The case for it is access, case mix, surgeon recruitment, and competitive position. Facilities that model it as a revenue opportunity will be disappointed; facilities that model it as an enabling investment with a defined strategic purpose may find it worthwhile.

Multi-state operation is the highest-risk configuration

A single-state ASC can maintain one policy. A multi-state organization cannot, and the failure mode is uniform application of the most permissive state's standard. Because state extended recovery authorization is expanding, this risk is increasing rather than diminishing, and it sits at exactly the intersection of licensure, payment, and patient safety where the consequences are most serious.

Rising acuity presses on the expected duration standard

The Inpatient Only list phase-out and the Covered Procedures List expansion are moving procedures with longer recovery profiles into the ASC. The pressure on the expected duration standard will increase, and it will arrive as individual case decisions made under schedule pressure rather than as a policy question. Leadership should decide where the facility's boundary is, in advance, rather than allowing it to be established case by case.

What leadership should require

• Case selection policy rewritten to the current 42 CFR 416.166 structure, governing body approved and dated.
• A required, documented expected duration judgment for every case, attributable to the operating physician.
• State-specific policy for every state of operation, with the federal standard for Medicare beneficiaries stated separately and explicitly.

• Verification with the Medicare Administrative Contractor of the current federal position on overnight recovery, given the age of some interpretive guidance relative to the 2026 amendments.

• Prolonged recovery, transfer, and unplanned admission rates reported to the governing body alongside volume, with foreseeability review.
• A decision, made deliberately at governance level, on whether the facility will offer extended recovery where state law permits it, modeled as an access investment.
• Scheduling policy treating case position as a clinical variable.

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GoHealthcare Case Study

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

Scenario

A multi-state musculoskeletal ASC organization operating four centers across three states expanded into higher-acuity spine and joint procedures following the CY 2026 Covered Procedures List expansion. One state authorized extended recovery up to 23 hours 59 minutes under a separate approval; a second permitted no overnight stay; the third had recently enacted an extended stay statute the organization had not yet reviewed. The organization operated a single national case selection policy.

Findings

• The national case selection policy was written against the five general exclusion criteria at 42 CFR 416.166(c), which ceased to operate as exclusions on January 1, 2026. No expected duration judgment was documented in any sampled case.
• In the state permitting extended recovery, the organization held the required approval. In the state permitting no overnight stay, two cases had been kept past midnight following prolonged recovery. Staff described both as observation.
• In the third state, the organization had not determined whether the new statute applied to its facility or what conditions attached.
• The policy stated the more permissive standard nationally, and made no distinction between what state law permitted and what the federal standard required for a Medicare beneficiary.
• Prolonged recoveries and transfers were logged but not reviewed for foreseeability. On retrospective review, a majority of transfers involved cases scheduled after two in the afternoon with procedures having long recovery profiles.

• The policy cited 42 CFR 416.65 for the proposition that convalescence must be short-term and not overnight. That section applies only to services furnished before January 1, 2008.
• One center's staff had begun describing extended recovery patients as being in observation on internal tracking forms, and one billing inquiry had been raised internally about whether observation could be billed.

Analysis

Clinical care was not implicated and no patient harm was identified. Every finding was a governance and regulatory-currency failure, of a type that is invisible until examined. The organization had expanded case mix and geography without revisiting either the regulation underlying its policy or the state-by-state variation its footprint had created.

The most consequential finding was the one that looked least serious: the absence of any documented expected duration judgment. With the 2026 conversion of categorical criteria into physician considerations, that record is the organization's entire evidentiary position on the question a surveyor is most likely to ask.

Resolution

• The case selection policy was rewritten to the current 42 CFR 416.166(b)(2) and (d) structure, addressing the seven physician considerations in substance and requiring an individualized, documented judgment.

• A short expected duration attestation was added to the pre-operative record, completed by the operating physician before the case.
• State-specific appendices were created for each state of operation, with the federal standard for Medicare beneficiaries stated separately and in bold, and the third state's statute reviewed with counsel.

• The organization confirmed the current federal position on overnight recovery with its Medicare Administrative Contractor in writing and retained the response.
• The 42 CFR 416.65 citation was removed from all policies.
• Observation vocabulary was eliminated from all ASC forms and staff education, and the internal billing inquiry was answered definitively in policy.
• Scheduling policy was changed to place long-recovery procedures earlier in the day, with staffed hours treated as a hard constraint.

• Prolonged recovery and transfer review was added to QAPI with an explicit foreseeability question and reporting to the governing body alongside volume.

Outcome

Transfers declined measurably within two quarters, with the largest contribution from the scheduling change rather than from any change in selection criteria. The state-specific appendices identified one center that had been operating a practice its state did not authorize. The expected duration attestation, initially resisted as additional documentation burden, was reported by surgeons as taking under a minute and by the administrator as the most useful record the organization had added in years.

Lessons learned

• When a regulation converts a categorical criterion into a judgment, the compliance obligation becomes a record. The record must be deliberately created; nothing produces it automatically.
• Multi-state operation cannot run on a single policy in an area where state law diverges materially, and the divergence is expanding.
• State authorization and the federal standard are different questions, and policies that state only the more permissive of the two invite the error.
• Vocabulary matters. Observation does not exist in an ASC, and importing the term imports assumptions that do not hold.
• Schedule position is a clinical variable and one of the few controllable inputs to prolonged recovery.
• Superseded citations propagate silently through policy documents for years. 42 CFR 416.65 has not governed current services since 2008 and is still widely cited.
• Foreseeability review of transfers improves selection in a way that outcome review does not.

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GoHealthcare Best Practices

Domain	Practice
Policy currency	Case selection policy written to the current 42 CFR 416.166(b)(2) and (d) structure, governing body approved, dated, and reviewed annually and after each rule cycle.
Expected duration record	A required, brief, attributable physician statement of expected duration and its basis, documented before every case.

Domain	Practice
State-specific structure	A state appendix for each state of operation, with the federal standard for Medicare beneficiaries stated separately and explicitly.
Contractor confirmation	The current federal position on overnight recovery confirmed in writing with the Medicare Administrative Contractor and retained.
Extended recovery governance	Where offered, all state conditions satisfied and documented, with admission criteria, staffing, environment, and discharge criteria specific to the extended recovery area.
Vocabulary discipline	Observation and two-midnight terminology eliminated from ASC forms, policies, and staff education.
Scheduling	Case position treated as a clinical variable, with long-recovery procedures scheduled early and staffed hours treated as a constraint.
Transfer readiness	Current transfer agreement, documented pathway, and a defined transfer documentation set.
Foreseeability review	Every prolonged recovery, transfer, and unplanned admission reviewed through QAPI against the question of whether it was foreseeable at selection.
Governance reporting	Prolonged recovery, transfer, and unplanned admission rates reported to the governing body alongside volume.
Citation hygiene	Superseded citations, including 42 CFR 416.65 for current services, removed from all policy documents.
Cross-setting clarity	Where the organization operates both an ASC and a hospital outpatient department, separate work instructions maintained so that hospital mechanisms are not applied in the ASC.

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Common Mistakes

• Reading the 2026 criteria change as relaxing the length-of-stay standard. 42 CFR 416.2 is unchanged. What changed is which procedures may be on the list and who exercises the safety judgment.
• Operating a case selection policy written to the pre-2026 exclusion criteria. Those five criteria are now physician considerations, not exclusions.
• Failing to document the expected duration judgment. This is the direct compliance consequence of the change and the record almost no facility creates.
• Citing 42 CFR 416.65 as current authority. It applies only to services furnished before January 1, 2008.

• Assuming a procedure's presence on the Covered Procedures List implies short recovery. The midnight criterion no longer gates list inclusion.
• Treating state authorization as displacing the federal standard. For a Medicare beneficiary, the federal standard applies regardless of how permissive state law is.
• Running a single national policy across states with materially different law. The failure mode is uniform application of the most permissive standard.
• Describing an ASC patient as being in observation. ASCs do not furnish observation services and cannot bill them.
• Invoking the two-midnight rule in ASC case selection. It governs hospital inpatient admission and has no ASC application.

• Over-reading the IPO medical review exemption as a safe harbor. It exempts specified review activities and does not override the underlying two-midnight requirements or preclude medical necessity review.
• Assuming removal from the Inpatient Only list requires outpatient performance. It does not; 42 CFR 416.75 confirms inpatient coverage is not precluded.

• Modeling extended recovery as a revenue opportunity under Medicare. There is no separate Medicare payment for it.
• Managing schedule position for throughput alone. It is a clinical variable driving prolonged recovery.

• Logging transfers without foreseeability review. The review is what improves selection.

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Pearls and Pitfalls

Pearls

• Separate the four questions: may the procedure be done here, should it be done here for this patient, how long may the patient stay, and what status does the patient have. Most confusion dissolves once they are separated.

• Write the expected duration judgment down. It takes a physician under a minute and answers the question a surveyor is most likely to ask.
• Build the case selection policy on the substance of the seven physician considerations rather than on a literal reading of the paragraph.
• State the federal standard separately and explicitly in every state appendix.
• Schedule long-recovery cases early. It is the cheapest intervention available and has the largest measured effect on transfers in our experience.
• Ask the foreseeability question after every transfer.
• Confirm the current federal overnight position with the MAC in writing and keep the answer.

Pitfalls

• The expected duration standard is prospective. Outcome does not establish compliance, and a good outcome does not cure an unreasonable expectation.
• State extended recovery statutes differ on the maximum period, on when the period begins, on licensure prerequisites, and on operating history requirements. Read each one.
• Interpretive guidance in this area predates the 2026 amendments. Neither continuity nor change should be assumed.
• The IPO medical review exemption ends when the Secretary determines the procedure is more commonly performed in the outpatient setting, with removal implemented through rulemaking.
• There is no separate Medicare payment for extended recovery in an ASC, whatever state law permits.
• The physician considerations paragraph mixes factors pointing in opposite directions; policy built on a literal reading will be incoherent.
• An entity whose case mix routinely approaches or exceeds the expected duration window is not operating as an ASC as defined, irrespective of individual case compliance.

• Hospital status mechanisms have no ASC analogue, and attempting to apply them creates both billing and compliance exposure.

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Frequently Asked Questions

Q1. How long can a patient stay in an ASC?

Under 42 CFR 416.2 an ASC operates for patients whose expected duration of services would not exceed 24 hours following an admission. It is a definitional standard applied prospectively at case selection, not a stopwatch applied at discharge. State licensure law may impose a different or shorter limit.

Q2. Did the CY 2026 rule change how long a patient may stay in an ASC?

No. 42 CFR 416.2 is unchanged. What changed is the ASC Covered Procedures List criteria at 42 CFR 416.166 and the conversion of several categorical criteria into physician considerations.

Q3. What exactly changed at 42 CFR 416.166?

Through December 31, 2025, covered procedures had to meet general standards at 416.166(b)(1), including that standard medical practice dictates the beneficiary would not typically require active medical monitoring and care at midnight following the procedure, subject to eight exclusions at 416.166(c). Effective January 1, 2026, covered procedures must meet requirements at 416.166(b)(2): separately paid under the OPPS, and not designated as requiring inpatient care, not reportable only with a CPT® unlisted surgical procedure code, and not otherwise excluded. The midnight criterion and five former exclusions moved to physician considerations at 416.166(d).

Q4. What are the physician considerations at 416.166(d)?

Safety factors a physician should consider as to a specific beneficiary when determining whether to perform a covered surgical procedure: that the procedure is not expected to pose a significant safety risk in an ASC; that standard medical practice dictates the beneficiary would not typically require active medical monitoring and care at midnight; and the factors of extensive blood loss, major or prolonged invasion of body cavities, direct involvement of major blood vessels, emergent or life-threatening nature, and common requirement for systemic thrombolytic therapy.

Q5. Does a procedure appearing on the ASC Covered Procedures List mean it is unlikely to require an overnight stay?

No longer a safe inference. The midnight criterion no longer gates list inclusion, so the list may contain procedures that could require monitoring at midnight in some patients. The judgment is now the physician's, for the individual beneficiary.

Q6. Can an ASC keep a Medicare patient overnight?

CMS survey and certification guidance 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. Given the age of the guidance relative to the current regulatory text, facilities should confirm the current position against current Appendix L guidance and with their Medicare Administrative Contractor rather than relying on secondary summaries.

Q7. Our state allows a 48-hour stay. Does that apply to Medicare patients?

State authorization governs the facility's state licensure. It does not amend 42 CFR 416.2 and does not create Medicare payment for a stay inconsistent with the federal definition of an ASC. For a Medicare beneficiary the federal standard applies regardless of how permissive state law is.

Q8. Can we cite 42 CFR 416.65 for the short-term, non-overnight convalescent room standard?

Not as current authority. 42 CFR 416.65 by its own terms applies only to services furnished before January 1, 2008. It is widely and incorrectly cited as a current standard, and it should be removed from policy documents addressing current services.

Q9. Can an ASC bill observation services?

No. Observation is a hospital outpatient service. ASCs do not furnish observation services and cannot bill them. An ASC patient is an outpatient of the ASC for the entire encounter, including any extended recovery period authorized by state law.

Q10. Is there additional Medicare payment for extended recovery in an ASC?

No. There is no separate Medicare payment for an extended recovery period in an ASC. Where a commercial contract provides for it, that is a contractual matter to be confirmed.

Q11. Does the two-midnight rule apply to ASCs?

No. The two-midnight framework at 42 CFR 412.3 governs the hospital inpatient admission decision. It has no application to ASC length of stay and should not be invoked in ASC case selection discussion.

Q12. What is the two-midnight benchmark?

Generally, inpatient admission is appropriate under Medicare Part A where the admitting physician expects the patient to require hospital care spanning at least two midnights. CMS has also permitted case-by-case flexibility for admissions not meeting the benchmark, based on the admitting physician's judgment and supporting documentation.

Q13. What is the IPO medical review exemption?

Procedures removed from the Inpatient Only list on or after January 1, 2021 are exempt from site-of-service claim denials, from Medicare review contractor referrals to the Recovery Audit Contractor for persistent two-midnight noncompliance, and from RAC patient status reviews. CMS continued the exemption for CY 2026 and subsequent years until the Secretary determines the procedure is more commonly performed for the Medicare population in the outpatient setting.

Q14. Does the exemption mean we do not need to document inpatient admission decisions?

No. CMS emphasized that the exemption does not override the underlying two-midnight requirements and that physicians must continue to document inpatient admission decisions under existing criteria. Contractors may still deny claims on other grounds, including medical necessity.

Q15. Does removal from the Inpatient Only list mean the procedure must be done outpatient?

No. Removal makes the procedure eligible for outpatient payment; it does not require outpatient performance. CMS has been explicit that removed services may still be furnished inpatient and paid under Part A where applicable criteria are met, and 42 CFR 416.75 confirms that inclusion as an ASC covered procedure does not preclude inpatient coverage.

Q16. What happens if a patient's recovery is longer than expected?

An unanticipated prolonged recovery is not in itself a compliance problem, because the standard turns on the reasonableness of the expectation formed before the case. Manage it clinically, document the course and the decision-making, complete discharge or transfer, and feed the event into case selection review.

Q17. What documentation should exist before the case?

An explicit, attributable statement by the operating physician of the expected duration of services and the basis for that expectation, together with the physician's consideration of the applicable safety factors. This is the direct compliance consequence of the 2026 change and is the record that answers the central audit question.

Q18. Where should that record live?

Anywhere it exists before the case, is attributable, and is retrievable - the pre-operative note, a case selection attestation, or a structured scheduling field. What does not work is relying on the operative report, which is written after the outcome is known.

Q19. Does schedule position matter?

Materially. Expected duration is a property of the procedure, the patient, and the schedule position together. A case comfortably within the window in the morning may not be in the late afternoon. Scheduling is one of the few controllable inputs and is usually managed for throughput alone.

Q20. What should a state-specific extended recovery policy address?

The maximum permitted period; the point from which it runs; licensure or approval prerequisites; any operating history requirement; admission criteria for the extended recovery area; screening requirements; the designated decision-maker where candidacy is in question; environment and staffing requirements; transfer agreements and privileges; and discharge criteria with a defined action if discharge cannot occur within the period.

Q21. How should transfers be documented?

Indication, decision time and departure time, mode of transport and level of care, receiving facility and accepting physician, report given, patient condition, family notification, and the transfer agreement invoked.

Q22. Should transfers be reviewed?

Yes, through the QAPI program under 42 CFR 416.43, and specifically against the question of whether the event was foreseeable at case selection. That question improves future selection in a way that outcome review does not. Transfer rate is also an ASCQR reported measure.

Q23. Is transfer rate a quality measure?

All-cause hospital transfer or admission is an ASCQR reported measure, and it is also a governance indicator of case selection quality. It should be visible to the governing body alongside volume.

Q24. Should our case selection policy still list the five general exclusion criteria?

It should address the same substance, but not as categorical exclusions. Those five factors moved to 42 CFR 416.166(d) as physician considerations effective January 1, 2026. The policy should frame them as factors to be weighed and documented for the individual beneficiary.

Q25. Is the physician considerations paragraph internally consistent?

Read literally as a list of attributes the procedure has, it mixes reassuring and concerning factors without consistent framing. Read as a list of safety factors to be weighed for the individual patient, which is how it is titled, it is coherent. Build policy on the substance rather than on a literal checklist reading, and confirm with the MAC if in doubt.

Q26. We operate in three states. Can we have one policy?

Not in this area. State law diverges materially and is becoming more permissive in more states. The workable structure is a core policy with state-specific appendices, and the federal standard for Medicare beneficiaries stated separately and explicitly in each.

Q27. Is offering extended recovery financially worthwhile?

Under Medicare it generates no separate payment, so it should be evaluated as an access, case mix, and competitive-position investment rather than a revenue opportunity. The costs are real - staffing, environment, and licensure - and should be modeled against the strategic purpose.

Q28. What is the single highest-yield control in this area?

The documented expected duration judgment, made by the operating physician before the case. It takes under a minute, it is the direct compliance consequence of the 2026 regulatory change, and it converts the central audit question from unanswerable to answerable.

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Key Takeaways

• 42 CFR 416.2 is unchanged: an ASC serves patients whose expected duration of services would not exceed 24 hours following admission. The standard is prospective, applied at case selection.
• Effective January 1, 2026, 42 CFR 416.166(b)(2) governs Covered Procedures List inclusion: separately paid under the OPPS and not inpatient-designated, unlisted-code-only, or otherwise excluded.
• The midnight criterion and five former categorical exclusions moved to 42 CFR 416.166(d) as physician considerations for the individual beneficiary. The guardrail became a judgment.
• The direct compliance consequence is a record: a documented, attributable physician judgment of expected duration and the safety factors weighed, created before the case.
• A procedure's presence on the Covered Procedures List no longer implies it is unlikely to require monitoring at midnight.

• 42 CFR 416.65 applies only to services furnished before January 1, 2008 and should not be cited as current authority for the non-overnight convalescent room standard.
• State law diverges materially and permissively. State authorization governs licensure; it does not displace the federal standard for a Medicare beneficiary.
• ASCs do not furnish observation services, cannot bill them, and have no patient status other than outpatient.
• The two-midnight framework governs hospital inpatient admission and has no ASC application.

• The IPO medical review exemption continues for CY 2026 and beyond but exempts only specified review activities; it does not override two-midnight requirements or preclude medical necessity review.
• Removal from the Inpatient Only list makes a procedure outpatient-eligible; it does not require outpatient performance.
• There is no separate Medicare payment for extended recovery in an ASC. It is an access proposition, not a revenue one.

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Future Outlook

Pressure on the expected duration standard will increase

The three-year Inpatient Only list phase-out and continued Covered Procedures List expansion will keep moving procedures with longer recovery profiles into the ASC. The expected duration standard will be tested more often, in more cases, under more schedule pressure. Facilities should decide where their boundary is deliberately rather than allowing it to be set case by case.

State extended recovery authorization continues to expand

More states have authorized extended recovery in recent years, with varying periods and conditions. The trend appears to be continuing, which increases both the operational option available to facilities and the compliance complexity for multi-state organizations. The gap between the most permissive state standard and the federal standard is widening, and that gap is where the exposure sits.

Federal guidance will need to catch up

Interpretive guidance addressing overnight recovery predates the 2026 restructuring of the Covered Procedures List criteria. Facilities should expect the guidance to be revisited and should monitor Appendix L revisions and contractor communications. In the interim, confirming the position directly with the Medicare Administrative Contractor and retaining the answer is the prudent course.

Physician judgment as the regulatory mechanism

The conversion of categorical criteria into documented physician judgment is now visible across the 2019 history and physical amendment, the CY 2026 Covered Procedures List restructuring, and the Inpatient Only list elimination. The pattern is consistent and appears durable. Its practical effect is to move compliance burden from meeting a rule to documenting a judgment, which advantages organizations with strong clinical governance and disadvantages those without.

Possible convergence of setting distinctions

As the Inpatient Only list disappears and the Covered Procedures List expands, the regulatory distinctions among settings are narrowing even as the payment distinctions remain. Whether policy eventually addresses that divergence - through site-neutral payment or otherwise - is a live question with substantial implications for ASC strategy.

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References

1. Electronic Code of Federal Regulations. 42 CFR 416.2 - Definitions (ambulatory surgical center). Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416/subpart-A/section-416.2

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

3. Electronic Code of Federal Regulations. 42 CFR 416.65 - Covered surgical procedures (applicable to services furnished before January 1, 2008). Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416

4. Electronic Code of Federal Regulations. 42 CFR 416.75 - Performance of listed surgical procedures on an inpatient hospital basis. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416

5. Electronic Code of Federal Regulations. 42 CFR Part 416 - Ambulatory Surgical Services, including the Conditions for Coverage at Subpart C. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-416

6. Electronic Code of Federal Regulations. 42 CFR 412.3 - Admissions (two-midnight policy), including paragraph (d)(2) as revised in the CY 2026 OPPS/ASC final rule. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-412/subpart-A/section-412.3

7. Electronic Code of Federal Regulations. 42 CFR 419.22 - Hospital outpatient services excluded from payment, including paragraph (n) addressing services requiring inpatient care. Website: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-419

8. Federal Register. Medicare Program: Hospital Outpatient Prospective Payment and Ambulatory Surgical Center Payment Systems, CY 2026 final rule, 90 FR 54084, November 25, 2025. Website: https://www.federalregister.gov/documents/2025/11/25/2025-20907/m edicare-program-hospital-outpatient-prospective-payment-and-ambulatory-surgical-center-payment

9. 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. Website: https://www.cms.gov/newsroom/fact-sheets/calendar-ye ar-2026-hospital-outpatient-prospective-payment-system-opps-ambulatory-surgical-center

10. Centers for Medicare & Medicaid Services. Fact Sheet: Two-Midnight Rule. Website: https://www.cms.gov/files/document/two-midnight-rule-fact-sheet.pdf

11. Centers for Medicare & Medicaid Services. State Operations Manual, Appendix L - Guidance for Surveyors: Ambulatory Surgical Centers. Website: https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/som107ap_l_ambulatory.pdf

12. 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

13. Centers for Medicare & Medicaid Services. Medicare Benefit Policy Manual, Publication 100-02, addressing hospital outpatient observation services. Website: https://www.cms.gov/medicare/regulations-guidance/manuals/internet-only-manuals-ioms

14. Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual, Publication 100-04, Chapter 4 (Part B Hospital) and Chapter 14 (Ambulatory Surgical Centers). Website: https://www.cms.gov/medicare/regulations-guidance/manuals/internet-only-manuals-ioms

15. Centers for Medicare & Medicaid Services. Ambulatory Surgical Center Quality Reporting Program. Website: https://www.cms.gov/medicare/quality/initiatives/asc-quality-reporting

16. Centers for Medicare & Medicaid Services. Ambulatory Surgical Center Payment System program page and annual addenda. Website: https://www.cms.gov/medicare/payment/prospective-payment-systems/ambulatory-surgical-center-asc

17. Ambulatory Surgery Center Association. State regulatory and legislative resources. Website: https://www.ascassociation.org

18. Accreditation Association for Ambulatory Health Care. Website: https://www.aaahc.org

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

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

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

22. American Society of Anesthesiologists. Standards, guidelines and statements, including Standards for Postanesthesia Care. Website: https://www.asahq.org/standards-and-practice-parameters

23. American Society of PeriAnesthesia Nurses. Standards for Perianesthesia Nursing Practice. Website: https://www.aspan.org

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

25. North American Spine Society. Clinical guidelines and coverage recommendations. Website: https://www.spine.org

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

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Reading Recommendations

• The current text of 42 CFR 416.166 in full, read with attention to the bifurcated structure at paragraph (a) and the new physician considerations at paragraph (d). This is short and is the single most important reading in this guide.
• 42 CFR 416.2, read alongside 416.166 to see clearly that they answer different questions.

• The CY 2026 OPPS/ASC final rule preamble discussion of the Covered Procedures List criteria revision and of the two-midnight medical review exemption.

• The applicable state ASC licensure statute and regulations for every state in which the organization operates, including any extended recovery or convalescent care provisions.
• The current CMS Two-Midnight Rule fact sheet, for organizations operating hospital outpatient departments.

• CMS State Operations Manual Appendix L in its current revision, checked specifically for any updated interpretive position on overnight recovery.
• The facility's accrediting organization standards addressing length of stay, extended recovery, and discharge.
• Peer-reviewed literature on outcomes and safety of ambulatory performance for the specific higher-acuity procedures the facility is adding, with attention to reported length of stay and transfer rates.

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Related GoHealthcare Resources

Guide	Focus	Status
B04-01 - ASC Prior Authorization	Medicare prior authorization regimes, site-of-service review, facility versus professional authorization. Corrected and reissued as version 1.1: the Section 3 citation to 42 CFR 416.65 was replaced with the current 42 CFR 416.166 authority.	Published
B04-02 - ASC Documentation Requirements	Conditions for Coverage architecture, medical record standards, the 2019 history and physical policy change, and survey readiness.	Published
B04-03 - Implant Authorization	Device-intensive payment, pass-through, device HCPCS reporting, and implant margin.	Published
B04-04 - Medical Device Coverage	FDA pathways, coverage determinations, investigational status, and the 2026 emerging technology pathway realignment.	Published
B04-05 - Same-Day Surgery Documentation	The perioperative record from arrival through discharge, including the October 2025 ASA standard revisions.	Published
B04-06 - Observation versus Outpatient	This guide.	Published
B04-07 - Medicare ASC Billing	ASC payment system mechanics, packaging, and claim construction.	Planned
B04-08 - Commercial ASC Billing	Contract structures, carve-outs, and balance billing protections.	Planned
B04-09 - Revenue Cycle for ASCs	Revenue cycle design, key performance indicators, and denial management.	Planned
B04-10 - Compliance and Accreditation	Compliance program design, accreditation strategy, survey readiness, and quality reporting.	Planned

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35

Recommended Downloads

• Expected Duration Attestation - a brief physician statement of expected duration and its basis, structured for completion before the case.
• Case Selection Policy Framework, 2026 Edition - built on the current 42 CFR 416.166(b)(2) requirements and the (d) physician considerations, with governing body approval block.

• Physician Considerations Worksheet - the seven factors at 416.166(d) with prompts for individualized assessment and documentation.
• State Length-of-Stay Matrix - by state: maximum permitted period, when the period begins, licensure prerequisites, operating history requirements, and conditions, with the federal standard stated separately.
• Extended Recovery Program Requirements Checklist - the recurring elements of state authorizing frameworks, for use in evaluating whether to offer the service.

• Four Questions Decision Card - may the procedure be done here, should it be done here for this patient, how long may the patient stay, what status does the patient have.

• Transfer Documentation Set - indication, timing, mode, receiving facility, report, condition, notification, and agreement invoked.
• Foreseeability Review Template - retrospective review of prolonged recovery, transfer, and unplanned admission against case selection.

• Setting and Status Comparison Card - ASC, hospital outpatient, observation, and inpatient across status, payment, claim format, and governing standard.
• Citation Hygiene Audit - a check of policy documents for superseded citations, including 42 CFR 416.65 and pre-2026 416.166 references.

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Visual Recommendations

Visual	Purpose	Placement
Four questions diagram	The four distinct questions separated, each with its governing authority and answer.	Regulatory Architecture section; strong as a standalone card.
Before-and-after criteria comparison	42 CFR 416.166 through December 31, 2025 versus effective January 1, 2026, showing which elements moved to physician considerations.	Regulatory Architecture section.
Expected duration decision tree	From procedure and patient factors through schedule position to the expected duration judgment and setting decision.	Case Selection section.
State length-of-stay map	Geographic visual of state extended recovery authorization with the federal standard noted as the overlay for Medicare beneficiaries.	When Extended Recovery Is Contemplated section.
Setting and status comparison matrix	ASC, hospital outpatient, observation, and inpatient across status, payment, claim format, and governing standard.	Setting and Status Comparison section.
Two-midnight framework diagram	The benchmark, the case-by-case exception, and the IPO exemption with its explicit limits.	Two-Midnight Framework section.
IPO exemption scope diagram	What the exemption covers and, prominently, what it does not.	Two-Midnight Framework section.
Divergence escalation flow	Recovery tracked against expectation, with escalation points and the deliberate decision between continued recovery and transfer.	Length-of-Stay Decision Workflow section.
Transfer documentation card	The transfer documentation set formatted for use at the point of transfer.	Transfer section.
Foreseeability review loop	Event through QAPI review to case selection criteria revision.	Transfer section and Best Practices.

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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

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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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