Lower Limb Prostheses — CPB 0578 | AETNA Coverage Update

Aetna modified CPB 0578 covering lower limb prostheses (HCPCS L5000–L5782 and related L-codes), effective February 20, 2026. Here's what billing teams need to do.

Aetna, a CVS Health company, updated its lower limb prostheses coverage policy under CPB 0578. This change touches 246 HCPCS codes spanning the full L5000–L5782 range, plus CPT codes 27590–27596 for thigh amputations through the femur. If your practice or DME supplier bills Aetna for prosthetic limbs, this policy sets the rules for what gets paid and what gets denied.

Quick-Reference Table

Aetna Lower Limb Prostheses Coverage Criteria and Medical Necessity Requirements 2026

The real issue with lower limb prosthesis billing is documentation. Aetna's CPB 0578 coverage policy runs on a checklist — and if one item is missing, the claim fails. Every criterion below must be met for medical necessity to hold.

Prescribing provider requirements. The prosthesis must be prescribed by a physician, nurse practitioner, podiatrist, or other health professional who is legally qualified to prescribe orthotics and/or prosthetics under state law. A prescription from an unqualified provider is a claim denial waiting to happen.

Functional impact standard. The prosthesis must significantly improve or restore physical functions required for mobility-related activities of daily living (MRADLs). Your prescribing provider must document — based on physical examination — that the member will be able to perform ADLs with the device. "Patient wants to walk better" is not documentation. A physical exam finding tied to a specific functional goal is.

Six-month prescription window. The prosthesis must be provided within six months of the prescription date. Miss that window, and reimbursement is off the table regardless of clinical need.

Provider credentialing requirements. The prosthetist must be certified and in good standing with at least one of the following:

If your prosthetist's credentials lapse or they're not in good standing with one of those bodies, Aetna will not consider the service covered. Verify credentials before every claim cycle.

Functional classification levels drive device eligibility. This is where lower limb prosthesis billing gets specific. Aetna uses a five-level classification system (Level 0 through Level 4) to determine which prosthetic components qualify under the coverage policy.

The table below reflects Level 0 and Level 1 as documented in CPB 0578. Levels 2–4 descriptions are based on standard CMS K-level definitions referenced in the policy — not verbatim CPB 0578 language. Review the complete policy at app.payerpolicy.org/p/aetna/0578 for the full criteria language.

Your documentation needs to place every member at a specific K-level. That classification determines which HCPCS codes from the L5000–L5782 range and related L-codes are covered. A mismatch between the documented K-level and the billed device code is a common source of claim denials on these claims.

Replacement prostheses. Aetna does not consider a replacement prosthesis medically necessary unless the member's current device fails to meet their medical needs or it is broken and unrepairable. Bill a replacement without that documentation, and expect a denial. This applies across the applicable L-codes under CPB 0578.

Aetna Lower Limb Prostheses Exclusions and Non-Covered Indications

Level 0 members are explicitly excluded from coverage. If the clinical assessment places a member at Level 0 — no ability or potential to ambulate or transfer safely — a prosthesis is not considered medically necessary under this coverage policy. Billing L-codes for a Level 0 member without extraordinary clinical justification will result in a claim denial.

Replacement prostheses without documented failure of the existing device are also not covered. Aetna's position is straightforward: if the current prosthesis works, it stays. "Patient wants a newer model" or undocumented functional decline will not support a replacement claim.

Services provided outside the six-month prescription window are not covered. There is no exception language in CPB 0578 for delays caused by supplier backlog or insurance processing time. Get the device delivered within six months of the prescription date, or get a new prescription.

Coverage Indications at a Glance

Aetna Lower Limb Prostheses Billing Guidelines and Action Items 2026

Lower limb prosthesis billing is high-dollar and documentation-heavy. These are the steps your billing team needs to take before and after the February 20, 2026 effective date.

If you're not sure how your patient mix maps to these criteria, talk to your compliance officer before the February 20, 2026 effective date.

CPT, HCPCS, and ICD-10 Codes for Lower Limb Prostheses Under CPB 0578

Covered HCPCS Codes (When Selection Criteria Are Met)

Note: The policy lists 246 total HCPCS codes. The codes above represent the documented range in CPB 0578. Review the complete code list at app.payerpolicy.org/p/aetna/0578 before updating your charge capture.