Medicare Advantage Claim Denied: Complete Appeal Guide

A Medicare Advantage (MA) denial can feel like a dead end, especially when you need care now. But federal law gives you powerful appeal rights — and knowing how to use them makes all the difference. Medicare Advantage plans must follow the same five-level appeal process as Original Medicare, and they are bound by CMS rules that many plans routinely violate.

Why Medicare Advantage Claims Get Denied

Medicare Advantage plans are run by private insurers — companies like Aetna, Humana, UnitedHealthcare, and BCBS — that contract with CMS to provide Medicare benefits. These plans use Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization (PA), medical necessity reviews, and network restrictions to control costs. Common denial reasons include:

• Prior authorization not obtained before a procedure or referral
• Medical necessity disputes — the plan argues the service isn't medically required
• Out-of-network provider used without meeting an emergency exception
• Coding errors — the service was billed under the wrong code
• Benefit not covered under the specific MA plan you enrolled in

Important: A Medicare Advantage denial is not the same as Medicare saying your care isn't covered. Plans frequently issue denials that do not hold up on appeal.

The 5-Level Medicare Advantage Appeal Process

CMS requires all Medicare Advantage plans to offer the same five-level appeal structure:

Level 1 — Organization Determination (Initial Decision) The plan issues its initial coverage or payment decision. If denied, you have the right to a formal appeal.

Level 2 — Redetermination by the Plan File within 60 days of the denial notice. The plan must issue its redetermination within 60 days (payment) or 30 days (coverage). If the plan upholds the denial, escalate.

Level 3 — Reconsideration by an Independent Review Entity (IRE) File within 60 days of the plan's redetermination. An independent organization reviews the plan's decision. At this stage, the plan is no longer the decision-maker.

Level 4 — Office of Medicare Hearings and Appeals (OMHA) If the IRE upholds the denial and the amount in controversy meets the threshold (around $180 in 2025), you can request an Administrative Law Judge (ALJ) hearing. File within 60 days of the IRE decision.

Level 5 — Medicare Appeals Council (MAC) File within 60 days of the ALJ decision. The MAC is the final internal CMS review. After this, federal district court is available for qualifying disputes.

Expedited Appeals: Your 72-Hour Right

When a standard appeal timeline would seriously jeopardize your life, health, or ability to regain maximum function, you can request an expedited appeal. The plan must respond within 72 hours at the redetermination level and within 72 hours at the IRE level for expedited cases.

To request an expedited appeal, your doctor must support the request or you must self-certify that your health is at serious risk. Do this in writing and keep a copy of everything.

What to Include in Your Appeal

A strong appeal letter includes:

• Your Medicare number and the plan's denial reference number
• A clear statement of what was denied and when
• Your doctor's letter explaining medical necessity in detail
• Relevant medical records, test results, and clinical notes
• Citations to Medicare coverage policy (LCD, NCD, or CMS guidelines)
• A statement of why the plan's denial reason does not apply

SHIP Counselors: Free Expert Help

Every state has a State Health Insurance Assistance Program (SHIP) that offers free, unbiased Medicare counseling. SHIP counselors are trained to help you:

• Understand your denial notice
• Navigate the appeal process
• Write your appeal letter
• Escalate to CMS if needed

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

Filing a CMS Complaint

If your plan is delaying your appeal, failing to provide timely decisions, or engaging in systematic denial practices, file a complaint directly with CMS at medicare.gov/talk-to-someone or call 1-800-MEDICARE. CMS has issued enforcement actions against major MA plans for improper denials and delayed approvals.

The Office of Inspector General (OIG) and CMS have both documented that Medicare Advantage plans deny care at significantly higher rates than Original Medicare — often for services Medicare would have covered. You have the right to push back.

Don't Accept the First Denial

Studies show that most Medicare Advantage appeals that reach the IRE level are decided in the beneficiary's favor. The first denial is often a form letter. The second appeal — with proper documentation — is where cases are won.

Start your appeal the day you receive the denial notice. Time limits are strict, and missing a deadline can forfeit your right to appeal.

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Related Reading:

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