Aetna Medicare Advantage Claim Denied: Appeal

Aetna is one of the largest Medicare Advantage providers in the United States, offering HMO, PPO, and dual-eligible special needs plans (D-SNPs) in dozens of states. Like all MA plans, Aetna Medicare Advantage must follow CMS rules — including a strict five-level appeal process. If Aetna denied your Medicare Advantage claim, you have clear options to fight back.

Why Aetna Medicare Advantage Claims Get Denied

Aetna MA plans use Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization, medical necessity reviews, formulary management, and network restrictions to manage costs. Common denial reasons include:

• Prior authorization denial: Aetna determined the requested service requires PA and either the PA was not obtained or was denied after review
• Medical necessity: Aetna's medical reviewers determined the service does not meet their coverage criteria
• Out-of-network provider: You received care from a provider outside Aetna's contracted network
• Step therapy requirements: Aetna requires you to try a less expensive treatment before approving the requested one
• Coverage limitation: The specific service is not included in your Aetna MA plan's benefit design

Important: Aetna MA plans are required by CMS to apply Medicare coverage standards — not more restrictive Aetna-specific criteria — when making medical necessity determinations. If Aetna denied a service that Original Medicare would cover, that denial deserves a strong challenge.

Aetna's Medicare Advantage Appeal Process

Aetna must follow the CMS-mandated five-level appeal process:

Level 1 — Redetermination by Aetna File your appeal within 60 days of the denial notice. Submit your appeal in writing to Aetna's Medicare Appeals department (address is on your denial notice). Include your physician's letter of medical necessity, relevant medical records, and a point-by-point rebuttal of Aetna's denial reason.

For urgent matters, request an expedited redetermination. Aetna must respond within 72 hours.

Level 2 — Reconsideration by an Independent Review Entity (IRE) If Aetna upholds its denial, escalate to the IRE within 60 days. The IRE is a CMS-contracted organization that reviews Aetna's decision without deference to Aetna's judgment. The IRE's decision is binding on Aetna.

Level 3 — ALJ Hearing at OMHA If the IRE upholds the denial and the amount in controversy meets the threshold, request an Administrative Law Judge hearing within 60 days. You can present evidence, testimony, and clinical arguments directly.

Level 4 — Medicare Appeals Council File within 60 days of the ALJ decision. The MAC reviews the legal and factual basis of the ALJ decision.

Level 5 — Federal District Court Available after exhausting all administrative levels, for qualifying disputes.

Requesting a Peer-to-Peer Review

If your physician ordered the service and Aetna's medical reviewer denied it, ask your physician to request a peer-to-peer review — a direct call with Aetna's medical reviewer. During the P2P, your physician can present clinical arguments that may not have been fully reflected in the initial authorization request. Many denials are overturned at the peer-to-peer stage.

Filing a CMS Complaint Against Aetna

CMS monitors Medicare Advantage plans for compliance with coverage and appeal rules. If Aetna is:

• Failing to meet appeal timelines (72 hours for expedited, 30 days for standard coverage)
• Issuing denials without adequate clinical justification
• Applying non-Medicare coverage criteria
• Delaying authorizations in ways that jeopardize your care

File a complaint with CMS at medicare.gov/talk-to-someone or call 1-800-MEDICARE. CMS has the authority to issue corrective actions and civil monetary penalties against MA plans that violate federal rules.

SHIP Counselors: Free Expert Help

Your state's SHIP (State Health Insurance Assistance Program) offers free, unbiased help with Medicare Advantage appeals, including Aetna MA plans. SHIP counselors can:

• Review your denial notice and identify appeal grounds
• Help you draft your redetermination letter
• Connect you with local resources
• Assist with CMS complaint filing

Find your state SHIP at shiphelp.org or call 1-800-MEDICARE.

Tips for a Strong Aetna MA Appeal

1. Act immediately: Appeal deadlines are strict. Start your appeal the day you receive the denial.
2. Get your physician involved: The most effective appeals are physician-driven, with detailed clinical documentation.
3. Cite Medicare coverage rules: Reference the applicable Local Coverage Determination (LCD) or National Coverage Determination (NCD) that supports coverage.
4. Request your case file: You have the right to request a copy of all documents Aetna used in making its denial decision. Review these for errors or missing information.
5. Don't stop at Level 1: Statistics show that MA appeal success rates increase significantly at higher appeal levels.

Fight Back With ClaimBack

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Related Reading:

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Internal vs External Insurance Appeal