Cardiopulmonary Exercise Testing — CPB 0825 | AETNA Coverage Update

TL;DR: Aetna, a CVS Health company, modified CPB 0825 governing cardiopulmonary exercise testing (CPET), effective December 5, 2025. If your team bills CPT 94621 for Aetna members, your medical necessity documentation requirements just changed.

Aetna updated its CPET coverage policy under CPB 0825 Aetna to expand the list of covered indications for CPT 94621—the primary code for cardiopulmonary exercise testing. The revised policy now explicitly covers Long COVID evaluation, sports eligibility after COVID-19 myocarditis, and interstitial lung disease functional evaluation, among other additions. This matters because CPET claims are high-scrutiny: the test has a broad differential and Aetna draws hard lines between covered and experimental use.

Quick-Reference Table

Aetna Cardiopulmonary Exercise Testing Coverage Criteria and Medical Necessity Requirements 2025

Aetna's CPET coverage policy sets a clear prerequisite before CPT 94621 is billable: standard testing must come first. That means echocardiography, pulmonary function testing with diffusion capacity measurement, and a 6-minute walk test with oxygen desaturation measurement. CPET is not a first-line workup under this policy. Document that standard testing was done and was either inconclusive or insufficient before you submit.

Once that prerequisite is met, Aetna considers CPET medically necessary for 14 specific indications. These span cardiology, pulmonology, transplant evaluation, and pediatric congenital heart disease. The breadth is real—but so is the specificity. A vague diagnosis like "exertional dyspnea" without documented prior workup will get denied.

The 14 covered indications under CPB 0825:

Long COVID and COVID-related myocarditis are explicit covered indications. If you treat those patients and haven't been billing CPT 94621 for CPET, review your encounter data now. This is reimbursement you may be leaving behind.

The prior authorization requirements for CPT 94621 under Aetna vary by plan. Check the member's specific benefit document. For employer-sponsored and individual Aetna plans, prior auth is commonly required for CPET—don't assume the covered indication alone clears the path. Confirm prior auth status before scheduling.

Aetna Cardiopulmonary Exercise Testing Exclusions and Non-Covered Indications

This is where Aetna's CPET coverage policy draws the line. The policy explicitly labels several indications as experimental, investigational, or unproven. Billing CPT 94621 for these will result in claim denial.

Aetna considers CPET experimental for:

The policy notes this is not an all-inclusive list. That language matters. Aetna can deny CPT 94621 claims for indications not listed as covered even if they're not named in the experimental list. The safer read: if the indication isn't on the covered list, treat it as not covered until you get explicit confirmation.

Coverage Indications at a Glance

Aetna Cardiopulmonary Exercise Testing Billing Guidelines and Action Items 2025

The effective date for these changes is December 5, 2025. If you're billing CPT 94621 for Aetna members now, these steps apply immediately.

CPT, HCPCS, and ICD-10 Codes for Cardiopulmonary Exercise Testing Under CPB 0825

Covered CPT Codes (When Selection Criteria Are Met)

Other CPT Codes Related to CPB 0825

These surgical codes appear in the policy in the context of Fontan procedure follow-up. CPET (CPT 94621) is covered for follow-up of patients who underwent these procedures.

Key ICD-10-CM Diagnosis Codes

The policy lists 295 ICD-10-CM codes. Below are the codes explicitly provided in the policy data. Your billing team should cross-reference the full list in CPB 0825 for complete coverage.

The full ICD-10-CM list includes 295 codes. Pull the complete code set directly from CPB 0825 on the Aetna policy portal before finalizing your charge capture updates.