Knee Arthroscopy / Osteoarthritis of the Knee — CPB 0673 | AETNA Coverage Update

Aetna modified CPB 0673 covering knee arthroscopy and osteoarthritis of the knee treatments, effective February 21, 2026. Here's what billing teams need to know before submitting claims.

Aetna, a CVS Health company, updated its knee arthroscopy coverage policy under CPB 0673 in the Aetna system. This policy governs a wide range of procedures billed under CPT codes including 29880, 29881, 29882, 29883, and 29874, along with dozens of HCPCS codes for injections and emerging treatments. The update tightens medical necessity criteria, draws harder lines around non-covered procedures, and adds explicit documentation rules for surgical disagreements with imaging reports. If your practice bills knee arthroscopy or intra-articular injections for Aetna members, read this before your next prior authorization request.

---

Quick-Reference: Aetna CPB 0673 Knee Arthroscopy Policy Change 2026

Field	Detail
Payer	Aetna, a CVS Health company
Policy	Knee Arthroscopy / Osteoarthritis of the Knee
Policy Code	CPB 0673
Change Type	Modified
Effective Date	February 21, 2026
Impact Level	High
Specialties Affected	Orthopedic Surgery, Sports Medicine, Pain Management, Interventional Radiology, Physical Medicine & Rehabilitation
Key Action	Audit your prior authorization workflows and documentation for OA grading, PT failure, and imaging confirmation before submitting any knee arthroscopy or injection claims

---

Aetna Knee Arthroscopy Coverage Criteria and Medical Necessity Requirements 2026

The real issue with CPB 0673 is that Aetna's medical necessity bar is genuinely high — and poorly documented charts will fail it every time.

Aetna covers arthroscopic knee surgery (CPT 29880, 29881, 29882, 29883) only when all of the following are true. The member must have significant knee pain plus mechanical symptoms. Osteoarthritis must be no more than mild — Kellgren-Lawrence grade 0, 1, or 2, or modified Outerbridge Grade 0, 1, or 2. And radiology must confirm the pathology. That means X-ray for loose bodies, MRI for meniscal tears and/or loose bodies.

Conservative therapy failure is also required. Specifically, the member must have completed at least six weeks of formal, in-person physical therapy within the past year. Home PT and virtual PT do not count. PT completion must be documented either by actual PT notes or by the member's claims history.

There is one exception to the conservative therapy requirement. If the member's knee is "locked" due to a displaced bucket handle tear of the meniscus, Aetna will waive the PT requirement. Document this clearly in the medical record.

For traumatic meniscal tears specifically, CPT 29882 and 29883 require MRI confirmation of the pathology, significant symptoms, and the same mild OA grading ceiling. Arthroscopic meniscal repair for medial or lateral meniscal root tears follows the same OA grading rule. Meniscal repair also requires documentation that the vascular supply to the torn portion is adequate and that the meniscal tissue is not degenerated on imaging.

Intra-articular glucocorticoid injections (CPT 20610, 20611; HCPCS J0702, J1100, J1700, J1720, J2650, J3300, J3301, J3302, J3303) are covered for knee OA under this coverage policy. This is a clean, broadly available coverage path — but billing teams should still confirm prior authorization requirements by plan type before scheduling.

One new documentation rule deserves your attention. If the operating surgeon disagrees with the official written report of a CT or MRI, that disagreement must be documented. The surgeon must discuss it with the interpreting provider, and a written addendum to the official report must note agreement or disagreement. Aetna will consider the official written report as the basis for coverage decisions. If your surgeons routinely override imaging reads at the time of surgery, your compliance officer needs to know about this requirement before the February 21, 2026 effective date.

---

Aetna Knee Arthroscopy Exclusions and Non-Covered Indications

Several procedures that billing teams frequently attempt to pass through prior authorization are explicitly not covered under CPB 0673.

CPT 29875 (minor synovectomy) is considered integral to all other arthroscopic knee procedures. You cannot bill it separately. CPT 29876 (major synovectomy) is only covered when a disease of the synovium — such as pigmented villonodular synovitis or synovial osteochondromatosis — is identified pre-operatively. Identifying it intraoperatively does not qualify. Note that the source code table places 29876 in the experimental/not-covered group, which conflicts with the narrative coverage condition. If you're billing 29876, talk to your compliance officer before submitting — this is an area where the policy text and code grouping don't align cleanly.

CPT 29877 (chondroplasty/debridement) cannot be approved on a pre-certification request. As an isolated procedure, it is not medically necessary for minor chondral lesions and is not approvable for significant arthritis. Aetna may consider it on a case-by-case basis post-operatively. This matters for your charge capture workflow — do not submit 29877 as a standalone pre-cert request.

CPT 29870 (diagnostic knee arthroscopy) is generally not considered medically necessary and not covered. The one exception: if radiologically proven pathology is not confirmed at surgery, you can bill 29870 post-operatively as medically necessary. Pre-certifying this code is a losing strategy.

CPT 29871 (arthroscopic lavage) is not covered for arthroscopic lavage. CPT 29875 is not covered for patellar debridement. These are explicit exclusions, not gray areas.

The following treatments are considered experimental, investigational, or unproven under this coverage policy:

If your practice offers any of these services and bills Aetna, expect denials. Appealing experimental designations is rarely successful without new peer-reviewed evidence. Talk to your compliance officer before billing these codes to Aetna members.

---

Coverage Indications at a Glance

---

Aetna Knee Arthroscopy Billing Guidelines and Action Items 2026

These are the steps your billing team and prior authorization staff should complete before February 21, 2026.

Copy Action Items

If your practice has a high volume of knee arthroscopy cases, loop in your compliance officer before the February 21, 2026 effective date to review your documentation protocols against these updated standards.

---

CPT, HCPCS, and ICD-10 Codes for Knee Arthroscopy and Osteoarthritis Under CPB 0673

Covered CPT Codes (When Selection Criteria Are Met)

Conditionally Covered / Integral Procedure CPT Codes

Code	Type	Description	Notes Copy
29870	CPT	Arthroscopy, knee, diagnostic, with or without synovial biopsy	Not covered pre-op; billable post-op if pathology not confirmed at surgery
29875	CPT	Arthroscopy, knee; synovectomy, limited	Integral to all other arthroscopic procedures; cannot be billed separately
29877	CPT	Arthroscopy, knee; debridement/shaving of articular cartilage (chondroplasty)	Cannot be pre-certified; case-by-case post-op review only

Not Covered CPT Codes for Listed Indications

Experimental / Not Covered CPT Codes

Covered HCPCS Codes (When Selection Criteria Are Met)

Experimental / Not Covered HCPCS Codes

Key ICD-10-CM Diagnosis Codes

CPB 0673 references 234 total ICD-10-CM codes. The full code list is available in the complete policy document at app.payerpolicy.org/p/aetna/0673.

---