Prosthetic Lower Microprocessor denied as not FDA-approved for this use by Aetna?

Aetna's specific coverage criteria for prosthetic lower microprocessor are defined in its own published medical/coverage policy and the FDA-approved prescribing label. A successful appeal documents that your medical records satisfy each criterion those sources list — confirmed diagnosis, any required prior treatments (with dates and outcomes), and clinical severity. If the exact criteria weren't included with your denial, request them in writing; your appeal then maps each requirement to the matching fact in your chart.

## Why Aetna Denied a Microprocessor Lower-Limb Prosthesis as "Not FDA-Approved"

This denial is almost always factually incorrect and is among the most straightforward to overturn. Microprocessor-controlled lower-limb prostheses are regulated by the FDA as Class II medical devices under 510(k) clearance — they are not unapproved experimental hardware. A "not FDA-approved" denial on a prosthetic device typically reflects a coding mismatch, a policy-routing error, or a reviewer applying a pharmaceutical approval standard (which does not apply to durable medical equipment) to a prosthetics claim.

Because the factual predicate of the denial is verifiable on the FDA's public 510(k) database, appeals on this basis have a high success rate.

## Your Federal Appeal Rights

Under ACA §2719 and ERISA §503:

• You have the right to a written explanation of precisely which approval standard Aetna applied and how the requested device failed it.
• An independent external reviewer will evaluate whether the denial standard was correctly applied — and reviewers regularly overturn denials that conflate pharmaceutical approval with device clearance.
• External review window: Approximately four months from the final internal denial — confirm the exact deadline in your denial letter.
• Expedited review: Available when delay would jeopardize health, safety, or rehabilitation.

## The Appeal Process

1. Search the FDA's 510(k) database (accessible at fda.gov) for the specific brand and model of the microprocessor prosthetic device prescribed — obtain the 510(k) clearance number and clearance date. 2. Confirm the HCPCS code submitted on the claim matches the device's cleared intended use. 3. Request a written explanation from Aetna of which regulatory standard it applied and why it concluded the device does not meet it. 4. Submit the internal appeal with the FDA clearance documentation, the HCPCS code rationale, and your prescriber's letter. 5. If the internal appeal is denied, request external review and frame the appeal as a factual challenge to Aetna's regulatory determination.

## Documentation to Gather

• FDA 510(k) clearance record: Printed from fda.gov — shows the device's clearance number, cleared indications, and date of clearance.
• HCPCS code justification: From your prosthetist — confirms the billed code correctly describes the device.
• Prescriber and prosthetist letters: Confirm this is a cleared device being used within its cleared indication.
• Aetna's denial letter: Specifically identify which regulatory standard is cited — this is the claim you are rebutting.
• Aetna's coverage policy: Printed current version, to confirm whether the policy actually requires FDA approval or whether a device-clearance standard applies.

## Criteria-Mapping Structure

One-page exhibit: left column = Aetna's stated regulatory basis for denial; right column = FDA clearance record entry refuting it. Attach the printed 510(k) clearance page. Keep the rebuttal to the factual record — this type of denial does not require elaborate clinical argument, only accurate regulatory documentation.