Aetna Medicare Advantage Denied: Your Full Appeal Rights

Aetna is one of the largest Medicare Advantage (Part C) insurers in the United States, covering millions of Medicare beneficiaries through plans sold in dozens of states. If Aetna denied a claim, Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization, or coverage decision under your Medicare Advantage plan, you have specific federally protected appeal rights that are stronger than those available under commercial insurance.

This guide explains the Aetna Medicare Advantage denial appeal process from start to finish.

Why Aetna Medicare Advantage Denies Claims

Medicare Advantage plans like those offered by Aetna (now a subsidiary of CVS Health) must cover all services that Original Medicare covers, but they can apply their own prior authorization requirements, network restrictions, and medical necessity standards. Common denial reasons include:

• Prior authorization not obtained or denied as not medically necessary
• Services provided by an out-of-network provider without an approved exception
• Claim submitted after the timely filing deadline
• Inpatient hospital stay or skilled nursing facility care denied as not meeting level-of-care criteria
• Specialty drugs not on Aetna's Medicare Advantage formulary

Understanding Your Rights Under Part C

Medicare Advantage enrollees have appeal rights under 42 CFR Part 422, which sets federally mandated timelines and processes that Aetna must follow. These rights are separate from and more protective than standard commercial insurance appeal rights.

CMS regularly audits Medicare Advantage plans for compliance with these requirements. Aetna has faced scrutiny from CMS regarding prior authorization denials and appeal processing. Knowing your rights puts you in a stronger position.

Step 1: Request an Organization Determination

Every Medicare Advantage appeal begins with an Organization Determination — a formal decision from Aetna on whether a service is covered and whether it will be paid. If you need a service and Aetna has not yet made a decision, or if a claim has been denied, you are entitled to request a formal organization determination in writing.

Contact Aetna Medicare Member Services at 1-800-282-5366 (TTY: 711). For members in specific Aetna Medicare Advantage plans, the number may vary — check your plan's Evidence of Coverage (EOC) document.

Standard organization determinations must be issued within:

• 14 calendar days for pre-service requests (non-urgent)
• 72 hours for expedited (urgent) pre-service requests
• 30 calendar days for payment decisions on claims already received

Step 2: File a Redetermination (Level 1 Appeal)

If Aetna issues an unfavorable organization determination, your first formal appeal is called a Redetermination. This is reviewed by a different Aetna department than the one that made the initial decision.

You must file the Redetermination request within 60 calendar days of the notice of denial. Aetna must complete standard redeterminations within 30 days for pre-service requests and 60 days for payment requests. Expedited redeterminations for urgent matters must be completed within 72 hours.

Submit your redetermination request in writing with supporting medical documentation from your treating physician.

Step 3: Reconsideration by a Qualified Independent Contractor (QIC)

If Aetna upholds the denial at the Redetermination level, you can escalate to a Reconsideration by an independent Qualified Independent Contractor (QIC) — an organization entirely separate from Aetna. CMS appoints QICs specifically to review Medicare Advantage appeal disputes.

File your QIC reconsideration within 60 days of the Redetermination decision. The QIC has 30 days for standard pre-service reconsiderations and 60 days for payment reconsiderations. Expedited QIC reviews must be completed within 72 hours.

The QIC decision is binding on Aetna, making this a powerful stage in the process. Many denials are overturned at this level, especially when robust medical documentation is submitted.

Step 4: Office of Medicare Hearings and Appeals (OMHA)

If the QIC upholds the denial, you can request an Administrative Law Judge (ALJ) hearing through the Office of Medicare Hearings and Appeals (OMHA). An ALJ hearing is a formal proceeding where you (or your representative) can present evidence and testimony.

To qualify for an ALJ hearing, the amount in controversy must be at least $190 (adjusted annually). File the request within 60 days of the QIC decision. The ALJ must issue a decision within 90 days.

Contact OMHA at 1-855-556-8475 or visit omha.hhs.gov.

Step 5: Medicare Appeals Council and Federal Court

If the ALJ rules against you, you can appeal to the Medicare Appeals Council (part of the Departmental Appeals Board) and, ultimately, to federal district court if the amount in controversy meets the threshold.

File a Complaint with Medicare or Your State

You can file a complaint about Aetna's Medicare Advantage practices with Medicare directly at 1-800-MEDICARE (1-800-633-4227) or at medicare.gov. Your State Health Insurance Assistance Program (SHIP) provides free counseling on Medicare appeals. Find your local SHIP at shiphelp.org.

The Medicare Rights Center also provides free assistance at medicarerights.org or 1-800-333-4114.

Fight Back With ClaimBack

Aetna Medicare Advantage denials involve a multi-level federal appeal system with strict deadlines. ClaimBack helps you navigate every stage with organized documentation and clear appeal language designed to meet CMS standards.

Start your appeal with ClaimBack

Related Reading

• How to Write an Insurance Appeal Letter
• Internal vs. External Insurance Appeals
• Common Reasons Insurance Claims Are Denied