Total Ankle Arthroplasty — CPB 0645 | AETNA Coverage Update

Aetna modified CPB 0645 covering total ankle arthroplasty, effective December 20, 2025. Here's what billing teams need to know before submitting claims under CPT 27702 and 27703.

Aetna, a CVS Health company, updated its total ankle arthroplasty coverage policy under CPB 0645 in the Aetna system. The policy governs CPT 27702 (total ankle arthroplasty with implant) and CPT 27703 (revision, total ankle). If your orthopedic or podiatric surgery practice bills these codes, this policy sets the medical necessity bar your cases have to clear — and the contraindication list is long enough that documentation gaps will cost you.

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Quick-Reference Table

Field	Detail Copy
Payer	Aetna
Policy	Total Ankle Arthroplasty
Policy Code	CPB 0645
Change Type	Modified
Effective Date	December 20, 2025
Impact Level	High
Specialties Affected	Orthopedic Surgery, Podiatric Surgery, Physical Medicine & Rehabilitation
Key Action	Audit pre-auth and documentation workflows for CPT 27702 and 27703 before submitting claims dated on or after December 20, 2025

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Aetna Total Ankle Arthroplasty Coverage Criteria and Medical Necessity Requirements 2025

The Aetna total ankle arthroplasty coverage policy under CPB 0645 covers CPT 27702 when six criteria are all met. Miss one, and you're looking at a claim denial.

Here are the six requirements:

The physical therapy requirement has teeth. Aetna specifies in-person therapy only — home PT or virtual PT does not count. The therapy must be recent (within the past year). For members under 50 or with a BMI over 40, the minimum jumps from six weeks to 12 weeks. Document this with actual PT notes or confirmed claims history. If you can't produce it, the prior authorization request fails before it starts.

One exception: Aetna waives the conservative management requirement when the member has bone-on-bone articulation in the weight-bearing portion of the joint. If your case involves severe osteoarthritis at that level, document it explicitly in the clinical notes.

For reimbursement under CPT 27703 (revision TAA), the bar is simpler: Aetna considers revision medically necessary for a failed total ankle prosthesis. Get the prior authorization documentation right the first time, because revision cases draw scrutiny.

Aetna's policy also specifies that the implant must be FDA-cleared. Approved implants named in the policy include the Agility LP Total Ankle, Eclipse Total Ankle, INBONE Total Ankle, Infinity Total Ankle System, STAR system, Salto Talaris Total Ankle Prosthesis, and Zimmer Trabecular Metal Total Ankle. If your surgeon uses a device not on this list, escalate to your compliance officer before submitting.

Check whether prior authorization is required for your specific plan by running CPT 27702 and 27703 through Aetna's CPT code search tool before scheduling. Not all plans require it, but enough do that skipping this step is a risk you don't want to take.

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Aetna Total Ankle Arthroplasty Exclusions and Non-Covered Indications

Aetna explicitly labels TAA as experimental, investigational, or unproven for all indications outside the criteria above. That's a hard wall — not a gray zone.

Beyond the general experimental designation, 22 specific contraindications disqualify a case from coverage entirely. These aren't soft clinical judgments. They're binary. If the condition is present, the claim won't pass medical necessity review. Here's the full list:

The corticosteroid injection timing rule is one your surgeons and schedulers need to know. A corticosteroid injection within 12 weeks of the planned procedure disqualifies coverage — even if every other criterion is met. Build a check for this into your pre-surgical intake process now.

The policy also designates trans-fibular total ankle arthroplasty and custom implants as non-covered. CPT codes 88331 and 88332 (pathology consultation during surgery) appear in the policy specifically tied to these non-covered approaches — a signal that Aetna is watching for these procedures in the OR record.

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Coverage Indications at a Glance

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Aetna Total Ankle Arthroplasty Billing Guidelines and Action Items 2025

The effective date is December 20, 2025. Claims for procedures on or after that date are subject to this updated policy. Here's what your billing team needs to do:

Copy Action Items

If your practice sees a high volume of ankle arthroplasty cases or serves a population with elevated BMI or complex comorbidities, talk to your compliance officer about how the updated criteria apply to your specific case mix before the December 20 effective date passes.

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CPT, HCPCS, and ICD-10 Codes for Total Ankle Arthroplasty Under CPB 0645

Covered CPT Codes (When Selection Criteria Are Met)

Code	Type	Description Copy
27702	CPT	Arthroplasty, ankle; with implant (total ankle)
27703	CPT	Arthroplasty, ankle; revision, total ankle

Non-Covered / Experimental CPT Codes

Code	Type	Description	Reason Copy
88331	CPT	Pathology consultation during surgery	Associated with trans-fibular TAA and custom implants — non-covered approaches
88332	CPT	Pathology consultation during surgery	Associated with trans-fibular TAA and custom implants — non-covered approaches

HCPCS Codes Related to CPB 0645

Code	Type	Description Copy
C1713	HCPCS	Anchor/screw for opposing bone-to-bone or soft tissue-to-bone (implantable)
C1741	HCPCS	Anchor/screw for bone fixation, absorbable (implantable)
C1776	HCPCS	Joint device (implantable)

Key ICD-10-CM Diagnosis Codes

The full policy references 623 ICD-10-CM codes. The table below covers the primary diagnosis categories most relevant to total ankle arthroplasty billing. Note that many codes in the full policy represent contraindications — conditions that disqualify coverage, not support it.

The obesity codes matter operationally: any member with a BMI over 40 triggers the extended 12-week PT requirement under this policy. Your intake team should flag these cases before they reach the pre-authorization stage.

The mononeuritis codes (G57 range) are contraindications — not supported diagnoses. If one of these appears in the member's problem list, the case doesn't qualify for TAA coverage under this policy.

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