GOHEALTHCARE MSK SPECIALTY PROCEDURE LIBRARY™

ACL Reconstruction

Operational, Documentation, Medical Necessity, and Prior Authorization
Guide for MSK Specialty Practices, ASCs, and Hospital Outpatient
Departments

Document Profile

Attribute	Detail
Procedure	Anterior Cruciate Ligament (ACL) Reconstruction, including primary and revision reconstruction and concurrent extra-articular augmentation
Library	GoHealthcare MSK Specialty Procedure Library™
Standard	GoHealthcare Clinical Procedure Guide Standard v1.0
Specialty	Orthopedic Surgery · Sports Medicine · Knee
Primary CPT® codes	29888 (arthroscopically aided ACL); 20924 (distant tendon graft); 27427 (extra-articular augmentation); 29999 / 27599 (unlisted)
Critical coding note	A single code — 29888 — covers repair, augmentation, AND reconstruction, and does not vary by graft type
Setting	Ambulatory Surgery Center (POS 24) · Hospital Outpatient (POS 22)
Version / Date	1.0 · July 2026 (two-pass code audit applied at authoring)
Author	Pinky Maniri, MSc, CRCR, CSAPM, CSPPM, CSBI, CSPR, CSAF · Certified in Healthcare A.I. Governance · Founder & Chief Executive Officer, GoHealthcare Practice Solutions

Contents

1. Evidence at a Glance2. Overview3. Relevant Anatomy (High-Level Overview)4. Clinical Indications5. Patient Selection6. Contraindications7. Conservative Treatment Requirements8. Imaging Requirements9. Medical Necessity10. Medicare Coverage11. Commercial Payer Comparison12. Prior Authorization Workflow13. Documentation Requirements14. Common Prior Authorization Denials15. Appeal Strategies16. Coding & Billing Overview17. Implants, Devices, and System Considerations18. Clinical Documentation Checklist (Operative Note)19. Procedure Comparison20. GoHealthcare Clinical Insights21. GoHealthcare Leadership Perspective22. GoHealthcare Prior Authorization Insight23. GoHealthcare Case Study24. GoHealthcare Best Practices25. Common Mistakes26. Pearls and Pitfalls27. Frequently Asked Questions28. Key Takeaways29. Future Outlook30. References31. Reading Recommendations32. Related GoHealthcare Resources (Internal Links)33. Recommended Downloads34. Visual Recommendations35. Document History36. Educational Disclaimer

1

Evidence at a Glance

ACL reconstruction is unusual in this library: the clinical evidence is strong, coverage is rarely contested, and the operational difficulty sits almost entirely in coding. A single CPT® code covers a procedure whose complexity ranges from a straightforward primary reconstruction to a multi-stage revision with tunnel bone grafting, and several commonly performed adjuncts have contested or absent codes. The revenue risk here is undercoding and unsupported unbundling, not denial.

Domain	Summary
Medicare NCD	No National Coverage Determination specific to ACL reconstruction. General "reasonable and necessary" standard applies (Social Security Act 1862(a)(1)(A)).
Medicare LCD / MAC	No dedicated national LCD. Traditional fee-for-service Medicare does not require prior authorization; medical review applies. ACL reconstruction is uncommon in the traditional Medicare population.
Commercial coverage	Well covered for symptomatic instability with a confirmed ACL tear. Managed via eviCore CMM-312, Carelon Joint Surgery, Cohere, Evolent/NIA, and TurningPoint.

Domain	Summary
Prior authorization	Required by most commercial plans and Medicare Advantage.
Evidence level	Strong for reconstruction in symptomatic instability, particularly in younger and higher-demand patients and where concurrent meniscal pathology is present. Graft choice is surgeon- and patient-specific rather than a coverage variable.
Single-code problem	29888 covers ACL repair, augmentation, and reconstruction alike, and does not vary by graft (bone-patellar tendon-bone, hamstring, quadriceps, or allograft). Revision reconstruction has no distinct code.
Imaging	MRI confirming ACL disruption is the standard supporting study, correlated with examination findings such as Lachman and pivot shift.
Conservative therapy	Expectations are lower than for degenerative knee procedures. Instability that fails or is unlikely to respond to rehabilitation, particularly in higher-demand patients, is the driver.
Adjunct procedures	Lateral extra-articular tenodesis and anterolateral ligament reconstruction are increasingly performed and carry contested coding. Meniscal work is frequently concurrent and follows compartment rules.
Key documentation	Mechanism and date of injury, instability episodes, examination findings, MRI confirmation, concurrent meniscal or chondral pathology, graft source, and — critically — where any graft was harvested from.
Typical approval driver	A confirmed ACL tear with documented functional instability in an appropriate candidate approves readily. The operational failures are coding failures.

2

Overview

ACL reconstruction replaces the torn anterior cruciate ligament with a graft passed through tunnels drilled in the tibia and femur and secured with interference screws, cortical buttons, cross pins, or similar fixation. Graft options include bone-patellar tendon-bone autograft, hamstring autograft, quadriceps tendon autograft, and allograft.

Operationally, this procedure is the mirror image of knee arthroscopy for degenerative meniscal tears. There, coverage is the battleground and coding is comparatively simple. Here, coverage is generally straightforward and the difficulty is that one code must absorb an enormous range of surgical work — while the adjuncts that add the most work either have contested codes or none at all.

The single-code problem

CPT® 29888 covers ACL repair, augmentation, and reconstruction. Unlike most orthopedic families, there is no separate code for repair versus reconstruction, and the code does not vary by graft type — bone-patellar tendon-bone, hamstring, quadriceps, and allograft all report the same way. There is also no distinct code for revision ACL reconstruction.

The consequence is that the operative note, not the code, is the only record of the work performed. For revisions and unusually complex primaries, modifier 22 with a supporting letter is the recognized mechanism — and it only works if the note documents specifically what made the case harder than a typical reconstruction.

3

Relevant Anatomy (High-Level Overview)

• Anterior cruciate ligament: the primary restraint to anterior tibial translation and a secondary restraint to rotation, running from the posteromedial aspect of the lateral femoral condyle to the anterior tibial plateau.

• Graft sources: central patellar tendon with bone plugs (bone-patellar tendon-bone), semitendinosus and gracilis (hamstring), central quadriceps tendon, or donor allograft. Where the graft is harvested from is a coding fact, not just a clinical one.

• Femoral and tibial tunnels: drilled at the native ACL footprint; tunnel position, widening, and malposition are the principal drivers of revision surgery.

• Anterolateral complex and iliotibial band: extra-articular structures contributing to rotational control. Lateral extra-articular tenodesis and anterolateral ligament reconstruction address rotational laxity and are performed through a separate lateral incision.

• Menisci: frequently injured concurrently. Meniscal treatment follows the knee compartment rules and may be separately reportable.

• Physes: in skeletally immature patients, open growth plates constrain tunnel placement and drive physeal-sparing or partial transphyseal techniques.

4

Clinical Indications

• Symptomatic anterior cruciate ligament insufficiency with functional instability — episodes of giving way, particularly with pivoting or cutting.

• Acute complete ACL tear in an active or higher-demand patient, where instability is anticipated.

• ACL tear with concurrent repairable meniscal pathology, where reconstruction protects the meniscal repair.

• ACL tear with associated multiligament injury or knee dislocation.

• Failed prior ACL reconstruction with recurrent instability — revision reconstruction, sometimes staged with tunnel bone grafting.

• ACL insufficiency in a skeletally immature patient with instability, using an age-appropriate technique.

• Chronic ACL deficiency with recurrent instability and secondary meniscal or chondral injury.

• Note that an isolated ACL tear in a low-demand patient without functional instability may reasonably be managed non-operatively; documenting the instability is what supports the request.

5

Patient Selection

Variable	Why it matters operationally
Functional instability	Documented giving-way episodes are the core indication. A confirmed tear without instability is a weaker request.
Activity demand	Pivoting and cutting demands — occupational or athletic — support reconstruction over rehabilitation alone.
Concurrent meniscal pathology	A repairable meniscal tear strengthens the case for reconstruction and adds separately reportable work.
Skeletal maturity	Open physes change technique and may invite closer review; document maturity status.
Primary vs. revision	Revision has no distinct code and requires modifier 22 or an unlisted code, plus documentation of what made it complex.
Graft source and site	Determines whether graft harvest is separately reportable — the single most consequential coding fact in this procedure.
Rehabilitation capacity	Reconstruction requires an extended structured rehabilitation program; ability to participate is a legitimate selection factor.

6

Contraindications

• Active infection or medical instability precluding safe anesthesia and surgery.

• Advanced degenerative arthritis of the knee, where reconstruction will not address the primary problem.

• Absence of functional instability in a low-demand patient willing to modify activity — a relative contraindication and a predictable denial.

• Inability or unwillingness to complete the extended post-operative rehabilitation program.

• Significant untreated malalignment or associated ligamentous insufficiency that would compromise the reconstruction if not addressed.

• Arthrofibrosis or severe motion loss at the time of surgery, which typically warrants staging.

7

Conservative Treatment Requirements

Element	What payers look for
Expectation level	Materially lower than for degenerative knee procedures. Payers recognize that a complete ACL tear producing instability in a higher-demand patient is unlikely to be resolved by rehabilitation alone.
Physical therapy	Where a trial is undertaken, document dates, the program, and the persistence of instability despite it. Pre-operative rehabilitation to restore motion is common and worth documenting.
Activity modification	Document the demands the patient cannot meet — occupational, athletic, or functional.
Bracing	Where attempted, document the response and any continued instability.
Recognized exceptions	Acute tear with concurrent repairable meniscal pathology, multiligament injury, and locked knee from a displaced meniscal fragment should not be routed through a prolonged non-operative pathway. Label these explicitly.
Documented instability	The essential element. Describe specific giving-way episodes and their circumstances rather than asserting instability generically.

8

Imaging Requirements

• MRI confirming ACL disruption is the standard supporting study, and should be quoted in the request. It also characterizes concurrent meniscal, chondral, and collateral ligament injury.

• Radiographs to assess skeletal maturity, physeal status, degenerative change, and any Segond fracture or bony avulsion.

• For revision cases, CT is frequently required to assess tunnel position, tunnel widening, and bone stock — and to determine whether a staged bone-grafting procedure is needed. Where a two-stage plan is contemplated, document it prospectively.

• Long-leg alignment films where malalignment may contribute to graft failure, particularly in revision.

• The request should quote the MRI sentence confirming the tear and, separately, describe the examination findings that establish instability.

9

Medical Necessity

Pillar	Documentation that demonstrates it
Confirmed ACL disruption	MRI report quoted, correlated with examination.
Functional instability	Specific giving-way episodes with circumstances, not a generic assertion.
Objective examination	Lachman, pivot shift, and anterior drawer findings compared with the contralateral knee.
Activity demand	The pivoting, cutting, or occupational demands the patient cannot currently meet.
Concurrent pathology	Meniscal, chondral, or collateral injury identified on imaging and planned for treatment.
Revision rationale	For revision: mode of failure, tunnel assessment, and whether a staged approach is planned.

10

Medicare Coverage

• No NCD and no dedicated national LCD govern ACL reconstruction; coverage rests on the general reasonable-and-necessary standard with MAC medical review.

• Traditional Medicare requires no prior authorization, and ACL reconstruction is not part of the Hospital Outpatient Department prior-authorization program.

• Medicare Advantage plans routinely require prior authorization and commonly delegate to eviCore, Carelon, Cohere, Evolent/NIA, or TurningPoint.

• Population note: primary ACL reconstruction is uncommon in the traditional Medicare population. Where it occurs, expect closer scrutiny of the instability documentation and of degenerative change on imaging.

• Post-payment exposure concentrates on separately reported graft harvest (20924) and on extra-articular augmentation codes reported alongside 29888.

11

Commercial Payer Comparison

Payer / vendor	How ACL reconstruction is managed (summary)
eviCore by Evernorth	CMM-312 (Knee Surgery — Arthroscopic and Open Procedures) governs. eviCore maintains discrete criteria summaries within CMM-312 for ACL Reconstruction and Repair and, separately, for ALL Reconstruction / LEAT (anterolateral ligament reconstruction and lateral extra-articular tenodesis) — confirming that the extra-articular adjuncts are reviewed on their own criteria rather than absorbed into the ACL request.
Carelon Medical Benefits Mgmt	Joint Surgery guideline and Musculoskeletal Program code list carry the knee ligament codes.
Cohere Health	MSK surgical authorization platform used by several plans including Humana lines; instability documentation and MRI correlation are the determinative fields.
Evolent / NIA	Knee surgery clinical guidelines with UM code matrices defining allowable billed groupings.
TurningPoint	Delegated surgical PA on many plans, with 2026 MSK policy updates affecting knee criteria including meniscal repair and cartilage procedures frequently performed concurrently with ACL reconstruction.
UnitedHealthcare / Aetna / Cigna / Humana	Each maintains knee surgery medical policy or delegates to a vendor; Cigna managed lines run through eviCore CMM-312.
Blue Cross Blue Shield plans	Vary by licensee; delegation may run to Carelon, eviCore, TurningPoint, or HealthHelp. Verify per plan, per cycle.
PA Insight: the adjunct is reviewed separately Because eviCore maintains a distinct criteria summary for anterolateral ligament reconstruction and lateral extra-articular tenodesis within CMM-312, a request that mentions only "ACL reconstruction" while the surgeon intends to add an extra-articular procedure has not actually been authorized for that adjunct. Identify the planned augmentation in the request and supply its own rationale — high-grade rotational laxity, revision setting, young pivoting athlete, generalized laxity — rather than assuming it travels with the primary reconstruction.

Payer guideline currency

eviCore's February 2026 policy update records that CMM-312 was revised with no clinically impactful changes in that cycle, alongside CMM-314 and CMM-318. By contrast CMM-311 (Knee Replacement/Arthroplasty), CMM-313 (Hip Replacement), and CMM-315 (Shoulder Surgery) were revised with clinical changes that LIMIT coverage, effective 03/07/2026 — relevant where a knee case may convert to an arthroplasty pathway. The Cigna commercial edition carries an effective date of 08/04/2026. Confirm the version in force at the time of service.

12

Prior Authorization Workflow

• 1. Eligibility & vendor identification. Confirm the vendor and locate the ACL-specific criteria within the knee surgery guideline.

• 2. Document instability. Specific giving-way episodes plus Lachman and pivot shift findings.

• 3. Quote the MRI. The sentence confirming ACL disruption, plus any concurrent meniscal or chondral findings.

• 4. Identify every planned procedure — meniscal repair or meniscectomy, cartilage work, and any extra-articular augmentation. Adjuncts reviewed on separate criteria must be requested separately.

• 5. Establish the graft plan and harvest site. This determines whether graft harvest is separately reportable and should be settled before the case, not discovered on the operative note.

• 6. For revision, document the mode of failure and whether the reconstruction will be staged; a planned two-stage approach should be disclosed up front.

• 7. Submit, track, confirm. Record authorization number, approved codes, and validity window; align facility and anesthesia authorization.

• 8. Reconcile before billing. Compare the operative note against the authorized codes, particularly for graft harvest site and adjunct procedures.

13

Documentation Requirements

• Mechanism and date of injury

• Specific instability episodes with circumstances (pivoting, cutting, stairs, occupational)

• Lachman, pivot shift, and anterior drawer findings versus the contralateral knee

• Range of motion and any effusion or mechanical block

• MRI report quoted, confirming ACL disruption and describing concurrent pathology

• Radiographic findings including skeletal maturity and degenerative change

• Activity and occupational demands the patient cannot meet

• Conservative measures attempted and the persistence of instability

• Planned graft type AND harvest site (same limb, contralateral limb, or allograft)

• Any planned concurrent meniscal, chondral, or extra-articular procedure

• For revision: mode of failure, tunnel assessment, and staging plan

• Laterality clearly documented

14

Common Prior Authorization Denials

Denial reason	Root cause / prevention
Instability not documented	Confirmed tear submitted without functional instability. Prevention: describe specific giving-way episodes.
MRI not correlated	Request submitted on examination alone, or MRI not quoted. Prevention: quote the confirming sentence.
Adjunct procedure not authorized	Extra-articular augmentation performed but never requested. Prevention: identify and justify it separately in the request.
Concurrent meniscal work not authorized	Meniscal repair or meniscectomy performed but not included in the request. Prevention: list all planned procedures.
Low-demand patient without instability	Reconstruction requested where activity modification is a reasonable alternative. Prevention: document demand and instability, or reconsider.
Revision without failure documentation	Revision requested without mode of failure or tunnel assessment. Prevention: obtain CT and document the mechanism of failure.
Degenerative change unaddressed	Advanced arthritis visible on imaging but not discussed. Prevention: address it proactively.

15

Appeal Strategies

• Answer the specific criterion cited; ACL criteria are itemized and respond well to point-by-point rebuttal.

• For instability denials, supply the specific episodes and the examination findings rather than restating the diagnosis.

• For adjunct denials, recognize that the extra-articular procedure is reviewed on its own criteria — supply the rotational laxity findings, revision status, or patient-specific risk factors that justify it.

• For revision denials, supply the CT tunnel assessment and the documented mode of failure.

• For coding-related denials on graft harvest, verify the harvest site before appealing — harvest from the same limb is correctly bundled and is not winnable.

• Preserve internal and external appeal deadlines; medical-necessity disputes qualify for independent external review.

16

Coding & Billing Overview

Operational overview for authorization and revenue-cycle teams. Descriptors verified against current CPT® references; bundling positions verified against CPT® Assistant and AAOS Global Service Data guidance. Detailed reimbursement methodology belongs in the GoHealthcare Revenue Cycle Knowledge Center.

Core Codes

CPT®	Descriptor	Operational notes
29888	Arthroscopically aided anterior cruciate ligament repair/augmentation or reconstruction	The single ACL code. Covers repair, augmentation, and reconstruction; does not vary by graft type. Under AAOS Global Service Data it includes associated work such as minor synovial resection and notchplasty.
29889	Arthroscopically aided posterior cruciate ligament repair/augmentation or reconstruction	The PCL counterpart, reported where the PCL is addressed.
20924	Tendon graft, from a distance (eg, palmaris, toe extensor, plantaris)	Separately reportable ONLY when the graft is harvested from a distant site — in practice the contralateral limb or an ankle. See the caution below.
27427	Ligamentous reconstruction (augmentation), knee; extra-articular	The code most often applied to lateral extra-articular tenodesis and anterolateral ligament reconstruction. See the discussion below; guidance is contested. MUE considerations apply.
27428 / 27429	Ligamentous reconstruction (augmentation), knee; intra-articular / intra-articular and extra-articular	Open ligament reconstruction codes; select by the structures addressed and the approach documented.
29999	Unlisted procedure, arthroscopy	Applies to arthroscopic procedures with no specific code, including thermal ACL procedures and arthroscopic techniques not described by an existing code. Also an alternative pathway for revision ACL.
27599	Unlisted procedure, femur or knee	The open counterpart, raised in published guidance as a possible alternative for certain extra-articular procedures.
Graft harvest: the rule practices most often get wrong Harvest of the graft from the same extremity is included in 29888 — whether the graft is bone-patellar tendon-bone, hamstring, or quadriceps tendon, and regardless of whether a separate incision was used. A separate incision in the same knee does not make the graft "from a distance." 20924 is reportable only when the graft is genuinely harvested from a distant site — in practice the contralateral limb or an ankle — with documented medical necessity for that choice, and with the appropriate distinct-service modifier. Allograft involves no harvest and generates no harvest code. Because the harvest site is the deciding fact, it must appear explicitly in the operative note.

Extra-Articular Augmentation — Contested Guidance

Lateral extra-articular tenodesis (including the modified Lemaire technique) and anterolateral ligament reconstruction are increasingly performed alongside ACL reconstruction to address rotational laxity. Published coding guidance has evolved and is not fully settled.

Authority / consideration	Position
CPT® Assistant, May 2017	Confirms that 27427 is not included in the global service package for 29888, and that 27427 and 29888 may therefore be reported for the same operative session, with modifier 51 appended to the additional procedure.
AAOS guidance	Notes that because the iliotibial band and anterolateral ligament are extra-articular structures, 27427 could apply where there is medical necessity for a separate procedure not described or valued within 29888.

Authority / consideration	Position
CPT® Assistant, March 2024	Revisited the question of whether 27427 or 27599 is appropriate for a lateral extra-articular tenodesis or modified Lemaire procedure. Practices should consult the current published guidance directly rather than relying on older references.
Practical dispute	Some coders question whether an iliotibial band tenodesis is properly a "ligamentous reconstruction," since the structure harvested is a tendinous band. Where the payer does not accept 27427, 29888 with modifier 22 and supporting documentation is the commonly used alternative.
Critical exception	If a portion of the iliotibial band is used to perform the ACL reconstruction itself — routed through the knee and attached to the proximal tibia — the tenodesis is not separately reportable.
NCCI	Edits may bundle the pair depending on the quarter and the payer. Verify the active edit and modifier indicator before billing.
Currency warning NCCI procedure-to-procedure edits and their modifier indicators are republished quarterly, and a modifier indicator of 0 means no documentation will unlock separate payment. Verify the active CMS edit files rather than relying on cached tables, vendor coding guides, or society publications, all of which lag. This applies with particular force to the extra-articular augmentation pair, where published guidance has changed within the last two years.

Revision ACL Reconstruction

There is no distinct CPT® code for revision ACL reconstruction. Two recognized pathways exist: report 29888 with modifier 22, supported by the operative report and a letter describing the additional work; or report 29999 as an unlisted procedure. The modifier 22 pathway is more commonly used and requires the note to identify specifically what made the case more complex — for example removal of prior graft and hardware, revision or bone grafting of malpositioned or widened tunnels, and extensive dissection through scar tissue. A revision billed as a routine primary undercodes the service and misrepresents its complexity.

Concurrent Procedures

Concurrent service	Reporting consideration
Meniscal repair or meniscectomy	Frequently performed with ACL reconstruction and may be separately reportable, subject to the knee compartment rules and current NCCI edits. See the companion Knee Arthroscopy guide.
Chondroplasty	Governed by the compartment rules; note that chondroplasty is included in the meniscectomy codes in any compartment.
Diagnostic arthroscopy (29870)	Not separately reportable. Under AAOS guidance it is also inclusive to open knee ligament repair and reconstruction procedures.
Collateral or posterolateral corner reconstruction	Separate ligament codes may apply; select by structure and approach, and confirm bundling.
Post-operative pain pump insertion	Not separately reportable; post-surgical pain management by the surgeon is part of the global package.
Assistant at surgery	Frequently used for graft preparation. Where the assistant reports separately, the surgeon should document the assistant's identity, the necessity, and the work performed.

Common ICD-10-CM Diagnosis Codes (FY2026, verified)

ICD-10-CM	Description	Coding note
S83.511A / S83.512A	Sprain of anterior cruciate ligament of right / left knee, initial encounter	The ACUTE family. 7th character A (initial), D (subsequent), S (sequela). Covers ACL tear and rupture.
M23.61- family	Other spontaneous disruption of anterior cruciate ligament of knee	The CHRONIC / non-acute family, with laterality. Use where chronic ACL deficiency rather than a current injury is documented.
S83.2- family	Traumatic tear of meniscus, current injury	For concurrent acute meniscal pathology; branches by tear type and meniscus, then laterality, with a 7th character.
M23.2- / M23.3-	Derangement of meniscus due to old tear or injury / other meniscus derangements	For concurrent chronic meniscal pathology.
S83.512- / S83.52-	Cruciate ligament sprain family	Note the S83 category carries an Excludes2 for internal derangement of knee (M23.-) — choose the family matching current injury versus chronic derangement.
M17.11 / M17.12	Unilateral primary osteoarthritis, right / left knee	Where degenerative change is present; its extent affects candidacy.
M25.561 / M25.562	Pain in right / left knee	Non-specific; never the sole support for reconstruction.
Z96.6- / T84.4-	Presence of orthopedic joint implant / mechanical complication of internal fixation device	Relevant in the revision setting where prior hardware is present; select the specific code.

Modifiers and Place of Service

Item	Guidance
RT / LT	Laterality; append per payer requirement.
22	Increased procedural services — the primary mechanism for revision ACL and unusually complex primaries. Requires the operative report and a supporting letter describing the additional work.
51	Multiple procedures — the modifier published guidance specifies for reporting 27427 alongside 29888.
59 / X{EPSU}	Distinct procedural service, including for distant graft harvest. Verify the current NCCI modifier indicator before use.
AS / 80 / 81 / 82	Assistant-at-surgery, when documented and supported.
POS 24 / 22	ASC and on-campus hospital outpatient are the standard settings; ACL reconstruction is well established as an outpatient procedure.

17

Implants, Devices, and System Considerations

• Fixation systems — interference screws (metal and bioabsorbable), cortical suspensory buttons, cross pins, and staples — from Arthrex, Smith+Nephew, Stryker, DePuy Synthes (Mitek), ConMed, and Zimmer Biomet. CPT® does not vary by fixation device or manufacturer.

• Allograft tissue introduces facility cost without generating a physician harvest code. Confirm how the facility reports and is reimbursed for allograft, as this materially affects ASC feasibility.

• Suture augmentation and internal bracing of the graft or repair are increasingly used; confirm the payer's coverage position and the correct reporting rather than assuming inclusion in 29888.

• Extra-articular augmentation constructs use anchors and interference fixation through a separate lateral incision; the device does not change the coding question, which is whether the procedure itself is separately reportable.

• Physeal-sparing constructs in skeletally immature patients use techniques that avoid or minimize physeal violation; document the technique and the maturity assessment.

• Physician professional coding does not separately report implants; facility implant reporting follows facility contracts and reporting rules.

18

Clinical Documentation Checklist (Operative Note)

• Laterality

[ ] Graft type AND harvest site stated explicitly — same limb, contralateral limb, or allograft. This single fact determines whether 20924 applies

• Whether the procedure was a repair, augmentation, or reconstruction

• Tunnel preparation and fixation devices used

• Compartment-by-compartment findings and any meniscal or chondral treatment

• Whether any extra-articular augmentation was performed, through what incision, and using what tissue

• If iliotibial band tissue was used, whether it formed part of the ACL graft itself or a separate tenodesis

• For revision: prior graft and hardware removed, tunnel findings, bone grafting performed, and dissection complexity

• Whether a diagnostic arthroscopy preceded the procedure (inclusive, not separately reportable)

• Assistant surgeon involvement and the work performed, where separately reported

• Findings supporting the reported diagnosis family (acute S83.51- vs. chronic M23.61-)

19

Procedure Comparison

Pathway	Typical patient	Codes	Authorization emphasis
Primary ACL reconstruction	Symptomatic instability, confirmed tear	29888	Instability + MRI confirmation
ACL with meniscal repair	Concurrent repairable meniscal tear	29888 + 29882/29883	Both procedures requested; compartment rules
ACL with extra-articular augmentation	High rotational laxity, revision, young pivoting athlete	29888 + 27427 (contested)	Adjunct reviewed on separate criteria
Revision ACL reconstruction	Failed prior reconstruction	29888-22 or 29999	Mode of failure; tunnel assessment; staging
Staged revision	Tunnel widening requiring bone graft	Staged; document prospectively	Two-stage plan disclosed up front
PCL reconstruction	PCL insufficiency	29889	Separate ligament criteria
Non-operative management	Low-demand, no instability	n/a	Often the appropriate alternative

20

GoHealthcare Clinical Insights

Operational recommendations from MSK authorization practice

• Add a mandatory graft harvest site field to the surgical booking form. It is the single most consequential coding fact in this procedure and is routinely absent from the operative note.

• List every planned procedure in the authorization request — meniscal, chondral, and extra-articular. Adjuncts reviewed on separate criteria are not authorized by an ACL request.

• Document instability as specific episodes with circumstances, not as a diagnosis restatement.

• For revisions, obtain CT tunnel assessment before submission and disclose any staged plan up front.

• Establish a written internal policy on extra-articular augmentation coding, informed by the current published guidance and by each major payer's position, rather than leaving it to case-by-case judgment.

• Reconcile the operative note against the authorized codes before billing, with particular attention to harvest site and adjunct procedures.

• Train coders that a separate incision in the same knee does not make a graft "from a distance."

21

GoHealthcare Leadership Perspective

Executive view: where a well-covered procedure still leaks value

ACL reconstruction inverts the usual pattern. Approval rates are high, criteria are stable, and peer-to-peer reviews are comparatively rare. Service lines that measure only approval rate will conclude the procedure is well managed. The value leak sits downstream, in the gap between the work performed and the work captured — a single code absorbing everything from a routine primary reconstruction to a revision requiring hardware removal, tunnel bone grafting, and extensive scar dissection.

Two disciplines close that gap. First, documentation that supports modifier 22 where the case genuinely warrants it — which requires the surgeon to describe the additional work specifically, not to assert complexity. Second, a settled organizational position on the extra-articular augmentation codes, informed by current published guidance and by each payer's stance, applied consistently and revisited as guidance evolves. Both are governance questions rather than clinical ones, and both are more tractable than the coverage fights that dominate other procedures in this library.

22

GoHealthcare Prior Authorization Insight

What we see that payer policies do not spell out

• Harvest site is the whole graft-coding question. Same limb is included, however separate the incision. Contralateral limb or ankle is reportable. Allograft generates nothing.

• The extra-articular adjunct has its own criteria set. An ACL-only request does not authorize it.

• Revision has no code. Modifier 22 with a specific operative description is the recognized route; asserting complexity without describing it does not work.

• If the IT band becomes the ACL graft, there is no separate tenodesis. This distinction lives entirely in the operative note.

• Instability is the indication, not the tear. A confirmed tear without documented functional instability is a materially weaker request.

• Published guidance on 27427 has moved. A March 2024 CPT® Assistant revisited it; positions taken from older references may be out of date.

• Don't bill the pain pump. Post-surgical pain management by the surgeon is inside the global package.

23

GoHealthcare Case Study

Educational scenario — details are illustrative and do not identify any actual patient or organization.

Clinical Scenario

A 22-year-old collegiate soccer player sustains a non-contact pivoting injury with immediate swelling and subsequent repeated giving-way episodes on cutting. Examination demonstrates a Lachman with soft endpoint and a high-grade pivot shift. MRI confirms a complete ACL tear with a peripheral lateral meniscal tear. Given the high-grade rotational laxity and the pivoting demand, the surgeon plans an ACL reconstruction with hamstring autograft, a lateral extra-articular tenodesis, and repair of the lateral meniscus.

Documentation and Coding Challenges

The authorization request described only "ACL reconstruction" and did not mention the planned tenodesis or the meniscal repair. The booking form did not record the graft harvest site. The billing team, seeing a hamstring autograft harvested through a separate incision, planned to report 20924 alongside 29888.

Barriers

Three separate exposures resulted. The extra-articular tenodesis is reviewed under its own criteria summary within the vendor's knee guideline and had never been requested. The meniscal repair was likewise unauthorized. And 20924 was not reportable: the hamstring graft was harvested from the same limb, and a separate incision in the same knee does not satisfy the "from a distance" requirement.

Payer Considerations

The plan did not dispute the medical necessity of the ACL reconstruction itself. Its concerns were scope of authorization and coding accuracy — both documentation problems.

Resolution Strategy

• Amended the request to list all three planned procedures, with the meniscal repair supported by the MRI finding and the tenodesis supported by the high-grade pivot shift, the pivoting demand, and the patient's age.

• Recorded the graft harvest site on the booking form and removed 20924 from the anticipated billing.

• Instructed the surgeon to document explicitly whether the iliotibial band tissue formed part of the ACL graft or a distinct tenodesis, since that distinction determines separate reportability.

• Confirmed the practice's written position on extra-articular augmentation coding against current published guidance and the plan's stance before the date of surgery.

Outcome

All three procedures were authorized on the amended request. The operative note documented the tenodesis as a distinct procedure using a separate iliotibial band strip, not as part of the ACL graft, allowing the practice to apply its documented coding position. Because 20924 was never billed, no post-payment adjustment arose.

Lessons Learned

• An ACL request authorizes an ACL reconstruction — not the meniscal work and not the adjunct.

• Graft harvest site is a coding fact and belongs on the booking form, not discovered afterward.

• Whether the iliotibial band became the graft or a separate tenodesis is a distinction only the operative note can make.

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GoHealthcare Best Practices

• Capture graft type and harvest site on the surgical booking form as mandatory fields.

• List every planned procedure in the authorization request, including adjuncts reviewed on separate criteria.

• Document instability as specific episodes rather than a diagnosis restatement.

• Obtain CT tunnel assessment before submitting a revision request and disclose staged plans up front.

• Maintain a written organizational position on extra-articular augmentation coding, reviewed against current published guidance.

• Require the operative note to distinguish iliotibial band used as ACL graft from a separate tenodesis.

• Reconcile the operative note to the authorized codes before billing.

• Check current-quarter NCCI edits before reporting any concurrent procedure with 29888.

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Common Mistakes

• Reporting 20924 for a graft harvested from the same limb, including through a separate incision.

• Reporting a graft harvest code for an allograft, where no harvest occurred.

• Billing a revision ACL as a routine primary, undercoding the service and misrepresenting its complexity.

• Asserting complexity for modifier 22 without describing the additional work in the operative note.

• Reporting an extra-articular tenodesis separately when the iliotibial band was used as the ACL graft itself.

• Assuming an ACL authorization covers concurrent meniscal work or extra-articular augmentation.

• Reporting diagnostic arthroscopy (29870) with ACL reconstruction, or with open knee ligament procedures.

• Using 29888 for a thermal ACL procedure, where an unlisted code applies.

• Relying on pre-2024 references for extra-articular augmentation coding without checking current guidance.

• Billing post-operative pain pump insertion separately.

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Pearls and Pitfalls

Pearls	Pitfalls
Record harvest site on the booking form.	Discovering it on the operative note.
Request every planned procedure explicitly.	Assuming the ACL request covers the adjunct.
Describe instability episodes specifically.	Restating the MRI diagnosis as the indication.
Use modifier 22 with a specific description.	Asserting complexity without documenting it.
Settle the 27427 position in writing.	Case-by-case guesswork on the augmentation code.
Distinguish IT band graft from tenodesis.	Separate reporting where the band became the graft.

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Frequently Asked Questions

Q1. What code reports an arthroscopic ACL reconstruction? 29888 (Arthroscopically aided anterior cruciate ligament repair/augmentation or reconstruction). A single code covers repair, augmentation, and reconstruction.

Q2. Does the code change with graft type? No. Bone-patellar tendon-bone, hamstring, quadriceps tendon, and allograft all report under 29888. Graft material does not affect code selection.

Q3. Is graft harvest separately reportable? Only when the graft is harvested from a distant site. Harvest from the same extremity is included in 29888, even through a separate incision.

Q4. When can 20924 be reported? 20924 (Tendon graft, from a distance) applies when the graft is obtained from a genuinely distant site — in practice the contralateral limb or an ankle — with documented medical necessity and the appropriate distinct-service modifier.

Q5. Does a separate incision in the same knee qualify as "from a distance"? No. Published guidance is explicit that a separate incision in the same knee does not constitute a sufficient distance to report the harvest separately.

Q6. Is there a code for allograft harvest? No. Allograft involves no harvest by the surgeon and generates no harvest code. Facility allograft cost is handled through facility reporting and contracts.

Q7. How is a revision ACL reconstruction coded? There is no distinct code. Report 29888 with modifier 22, supported by the operative report and a letter describing the additional work, or report 29999 as an unlisted procedure. Modifier 22 is the more commonly used pathway.

Q8. What should a modifier 22 letter describe? Specifically what made the case more complex — removal of prior graft and hardware, revision or bone grafting of malpositioned or widened tunnels, and extensive dissection through scar tissue. Asserting complexity without describing it does not support the modifier.

Q9. How is a lateral extra-articular tenodesis coded? Guidance is contested. CPT Assistant (May 2017) confirmed that 27427 is not included in the global service package for 29888 and that the two may be reported together with modifier 51. A March 2024 CPT Assistant revisited whether 27427 or 27599 applies to lateral extra-articular tenodesis and the modified Lemaire procedure; consult the current published guidance directly.

Q10. Why do some coders dispute using 27427? Because 27427 describes ligamentous reconstruction, while an iliotibial band tenodesis harvests a tendinous structure. Where a payer does not accept 27427, 29888 with modifier 22 and supporting documentation is the commonly used alternative.

Q11. Is the tenodesis ever not separately reportable? Yes. If a portion of the iliotibial band is used to perform the ACL reconstruction itself — routed through the knee and attached to the proximal tibia — the tenodesis is not separately reportable. Only the operative note can make this distinction.

Q12. Does an ACL authorization cover the extra-articular adjunct? Generally no. eviCore maintains a discrete criteria summary for anterolateral ligament reconstruction and lateral extra-articular tenodesis within CMM-312, meaning the adjunct is reviewed on its own criteria and must be requested separately.

Q13. Can meniscal repair be billed with ACL reconstruction? Frequently yes, subject to the knee compartment rules and the current NCCI edits. Both procedures should be identified in the authorization request.

Q14. Can diagnostic arthroscopy be billed with ACL reconstruction? No. 29870 is not separately reportable, and under AAOS guidance it is also inclusive to open knee ligament repair and reconstruction procedures.

Q15. What if the surgeon performs a thermal ACL procedure? 29888 should not be used. Published guidance directs an unlisted code (29999), because selecting a code that merely approximates the service is incorrect.

Q16. Which ICD-10 code supports an acute ACL tear? S83.511A (right) or S83.512A (left), sprain of anterior cruciate ligament of knee, initial encounter, with 7th character A, D, or S.

Q17. Which code applies to chronic ACL deficiency? The M23.61- family, other spontaneous disruption of anterior cruciate ligament, with laterality. Note the S83 category carries an Excludes2 for internal derangement of the knee (M23.-).

Q18. Is a conservative-care trial required? Expectations are materially lower than for degenerative knee procedures. A complete tear producing functional instability in a higher-demand patient is generally recognized as unlikely to resolve with rehabilitation alone. Document the instability.

Q19. Does traditional Medicare require prior authorization? No. There is no NCD or dedicated LCD, and ACL reconstruction is not in the OPD prior-authorization program. Medicare Advantage plans generally do require prior authorization.

Q20. Can the post-operative pain pump be billed separately? No. Post-surgical pain management by the surgeon is part of the global surgical package.

Q21. What are the most common avoidable problems? Reporting graft harvest for a same-limb graft, billing a revision as a routine primary, and performing adjunct procedures that were never authorized.

Q22. Where does detailed reimbursement analysis belong? Fee schedules, payment rates, NCCI/MUE tables, and revenue-cycle modeling belong in the GoHealthcare Revenue Cycle Knowledge Center, not in this operational guide.

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Key Takeaways

• 29888 is a single code covering ACL repair, augmentation, and reconstruction, and does not vary by graft type.

• Graft harvest from the same extremity is included; 20924 applies only to genuinely distant harvest.

• A separate incision in the same knee does not make a graft "from a distance."

• Revision ACL has no distinct code — use 29888 with modifier 22 and a specific operative description, or 29999.

• Extra-articular augmentation coding is contested and has moved since 2017; settle an organizational position against current guidance.

• If the iliotibial band becomes the ACL graft, no separate tenodesis is reported.

• Adjunct and meniscal procedures are reviewed on their own criteria and must be requested explicitly.

• Instability, not the tear alone, is the medical necessity.

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Future Outlook

• Extra-articular augmentation will continue to expand as evidence on rotational control and graft failure accumulates, increasing pressure for clearer coding guidance.

• Specialty pressure is likely to continue for a distinct revision ACL code, given the substantial work differential absorbed by a single code.

• Suture augmentation and internal bracing techniques will raise recurring coverage and reporting questions requiring case-by-case verification.

• Meniscal repair will continue to expand relative to resection in the ACL population, where preservation protects the reconstruction.

• Techniques for skeletally immature patients will continue to evolve ahead of the code set.

• Intelligent intake will increasingly auto-approve well-documented primary reconstructions, concentrating human review on revisions and adjunct procedures.

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References

• American Medical Association. Current Procedural Terminology (CPT®) and CPT® Assistant, including May 2017 and March 2024 guidance addressing knee ligament reconstruction coding. Website: https://www.ama-assn.org

• American Academy of Orthopaedic Surgeons (AAOS). Complete Global Service Data for Orthopaedic Surgery, and AAOS Now coding guidance on open knee procedures. Website: https://www.aaos.org

• Centers for Medicare & Medicaid Services (CMS). National Correct Coding Initiative (NCCI) Policy Manual and quarterly PTP edit files. Website: https://www.cms.gov/medicare/coding-billing/national-correct-coding-initiative-ncci-edits

• Centers for Medicare & Medicaid Services (CMS). Medicare Coverage Database (NCDs, LCDs, Articles). Website: https://www.cms.gov/medicare-coverage-database

• Centers for Medicare & Medicaid Services (CMS). Medicare Claims Processing Manual, Chapter 12 (global surgical package). Website: https://www.cms.gov/regulations-and-guidance/guidance/manuals

• eviCore by Evernorth. Comprehensive Musculoskeletal Management Guideline CMM-312 (Knee Surgery — Arthroscopic and Open Procedures), including criteria summaries for ACL Reconstruction and Repair and for ALL Reconstruction / LEAT. Website: https://www.evicore.com

• Carelon Medical Benefits Management. Joint Surgery Clinical Guideline and Musculoskeletal Program CPT® Codes and Descriptions. Website: https://guidelines.carelonmedicalbenefitsmanagement.com

• TurningPoint Healthcare Solutions. Musculoskeletal Medical Policies and 2026 Updates. Website: https://www.myturningpoint-healthcare.com

• Arthroscopy Association of North America (AANA). Practice management and coding resources. Website: https://www.aana.org

• American Orthopaedic Society for Sports Medicine (AOSSM). Website: https://www.sportsmed.org

• Devitt BM, Bouguennec N, Barfod KW, et al. Combined anterior cruciate ligament reconstruction and lateral extra-articular tenodesis does not result in an increased rate of osteoarthritis: a systematic review and best evidence synthesis. Knee Surg Sports Traumatol Arthrosc. 2017;25:1149–1160. Website: https://doi.org/10.1007/s00167-017-4510-1

• U.S. National Center for Health Statistics / CMS. ICD-10-CM (FY2026) Official Code Set. Website: https://www.cms.gov/medicare/coding-billing/icd-10-codes

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Reading Recommendations

• CPT® Assistant guidance addressing 27427, 27599, and knee ligament reconstruction coding, including the March 2024 discussion.

• AAOS Complete Global Service Data for what is included within 29888.

• Current eviCore CMM-312 criteria summaries for ACL Reconstruction and Repair and for ALL Reconstruction / LEAT.

• NCCI Policy Manual Chapter IV and current quarterly PTP edit files for knee code pairs.

• Literature on lateral extra-articular tenodesis and anterolateral ligament reconstruction outcomes.

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Related GoHealthcare Resources (Internal Links)

• GoHealthcare MSK Specialty Procedure Library™ — Knee Arthroscopy (compartment rules and concurrent meniscal coding).

• GoHealthcare MSK Specialty Procedure Library™ — Knee Arthroplasty (companion guide).

• GoHealthcare MSK Specialty Procedure Library™ — Shoulder guides (parallel single-code and bundling logic).

• GoHealthcare Revenue Cycle Knowledge Center — reimbursement methodology, NCCI/MUE, and fee-schedule detail.

• GoHealthcare Prior Authorization Playbooks and payer-policy watch. Website: https://www.gohealthcarellc.com

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Recommended Downloads

• ACL Reconstruction Prior Authorization Checklist (with all-planned-procedures field).

• Graft Type and Harvest Site Booking Form Field Specification.

• Modifier 22 Supporting Letter Template for Revision ACL.

• Extra-Articular Augmentation Coding Position Statement Template.

• Operative Note Reconciliation Worksheet (29888 with adjuncts).

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Visual Recommendations

• High-level knee ligament anatomy illustrating the ACL and the anterolateral complex.

• Graft source diagram with harvest-site coding implications annotated.

• Decision tree: same-limb versus distant harvest and its effect on 20924.

• Extra-articular augmentation coding decision aid reflecting current guidance.

• Primary versus revision documentation comparison supporting modifier 22.

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Document History

Version	Date	Summary
1.0	July 2026	Initial publication under GoHealthcare Clinical Procedure Guide Standard v1.0, continuing the Orthopedic Surgery — Knee batch. Two-pass code audit applied at authoring under the standing rule that official long descriptors and primary sources are verified rather than summaries. CPT® descriptors and bundling positions verified against CPT® Assistant guidance (May 2017 and the March 2024 revisit of 27427/27599) and AAOS Global Service Data; graft-harvest rules verified against published coding guidance; ICD-10-CM verified against FY2026 including the S83 Excludes2 for internal derangement of knee. Extra-articular augmentation coding is presented as contested rather than settled, consistent with the current state of published guidance. Payer content reflects eviCore CMM-312 including its discrete ACL and ALL/LEAT criteria summaries, Carelon Joint Surgery, and TurningPoint 2026 updates.

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Educational Disclaimer

Educational Disclaimer

This document is part of the GoHealthcare Practice Solutions Knowledge Center and is intended for educational and operational reference purposes only. It is not a physician training or surgical technique manual and does not replace physician clinical judgment, payer policy review, legal advice, or official CMS guidance. It does not provide procedural technique, implant selection, medication dosing, or physician procedural training. Coverage policies, coding guidance, and reimbursement requirements change frequently and vary by payer and jurisdiction; always verify current CPT®, HCPCS, and ICD-10-CM codes, current NCCI edits and modifier indicators, and the applicable payer's current medical policy at the time of service. Coding guidance for extra-articular augmentation performed with ACL reconstruction is contested and has changed within recent guidance cycles; verify the current published position before adopting a billing practice. Developed by Pinky Maniri, MSc, CRCR, CSAPM, CSPPM, CSBI, CSPR, CSAF, Certified in Healthcare A.I. Governance, Founder and Chief Executive Officer of GoHealthcare Practice Solutions.

Developed by Pinky Maniri

Developed by Pinky Maniri, MSc
CRCR · CSAPM · CSPPM · CSBI · CSPR · CSAF
Certified in Healthcare A.I. Governance
Founder & Chief Executive Officer, GoHealthcare Practice Solutions
A Musculoskeletal Specialty Management Services Organization (MSO)
Prior Authorization · Medical Necessity · Payer Intelligence · Revenue Cycle · Operations