Most seniors pay Medicare bills they shouldn't have to. Studies show over 40% of Medicare Advantage denials are overturned on appeal — yet fewer than 1% of eligible beneficiaries actually file one. This guide shows you exactly how to appeal any Medicare denial, step by step, from the first letter to a hearing if needed.
You have the legal right to appeal any Medicare coverage or payment decision. Your denial letter must include information about how to appeal. Free help is available through your State Health Insurance Assistance Program (SHIP) — find yours at shiphelp.org.
Common Reasons Medicare Denies Claims
Understanding why claims are denied helps you build a stronger appeal:
- Not medically necessary: The most common reason — Medicare doesn't consider the service necessary for your condition. A letter from your doctor explaining medical necessity often resolves this.
- Billing errors: Wrong diagnosis code, wrong procedure code, or duplicate billing. These are often resolved with a simple correction.
- Non-covered service: The service is excluded from Medicare coverage. These are harder to appeal unless you can show an exception applies.
- Prior authorization not obtained: Common with Medicare Advantage. Your doctor may not have gotten required pre-approval.
- Benefit exhausted: You have used your covered days or benefit limit for that period.
The 5 Levels of Medicare Appeal
Medicare has a formal 5-level appeal process. Most cases are resolved at Level 1 or 2.
Level 1 — Redetermination
Deadline: 120 days from the denial notice. Submit a written request to the Medicare Administrative Contractor (MAC) listed on your denial notice. Include your Medicare number, service date, claim number, and reason you disagree. Attach a letter from your doctor supporting medical necessity. Decision within 60 days.
Level 2 — Reconsideration
Deadline: 180 days from Level 1 decision. A Qualified Independent Contractor (QIC) — completely separate from Medicare — reviews your case. Submit additional documentation here. Decision within 60 days (or 72 hours for urgent care).
Level 3 — Office of Medicare Hearings and Appeals (OMHA)
Deadline: 60 days from Level 2 decision. Minimum disputed amount: $180 in 2026. An Administrative Law Judge (ALJ) hears your case. You can appear in person, by phone, or video. This level has the highest reversal rate. Average decision time: 90 days.
Level 4 — Medicare Appeals Council
If you disagree with the ALJ decision, you can appeal to the Medicare Appeals Council within 60 days. This is a paper review — no hearing. Decision within 90 days.
Level 5 — Federal District Court
Minimum disputed amount: $1,870 in 2026. Only pursue this level if you have a large claim and strong legal grounds. A healthcare attorney is recommended at this stage.
Step-by-Step: Filing Your Level 1 Appeal
- Get your denial notice. For Original Medicare, this is your Medicare Summary Notice (MSN) — mailed quarterly. For Medicare Advantage, it is the Explanation of Benefits (EOB).
- Understand the denial reason. The notice must explain why the claim was denied. Read it carefully — this tells you exactly what evidence you need.
- Contact your doctor. Ask for a letter explaining medical necessity in detail. The more specific to your condition, the better.
- Complete a Redetermination Request Form. Download CMS-20027 from cms.gov, or write a letter with your Medicare number, claim details, and reason for appeal.
- Submit your appeal. Mail or fax to the address on your denial notice. Keep copies of everything. Send via certified mail to prove delivery.
- Track your appeal. You can check the status at mymedicare.gov or by calling 1-800-MEDICARE.
Missing an appeal deadline usually ends your appeal rights for that claim. Set a calendar reminder immediately when you receive a denial. If you need more time, you can request an extension — but you must do this before the deadline passes.
Get Free Help With Your Appeal
You do not need to do this alone. Free, expert assistance is available:
- SHIP (State Health Insurance Assistance Program): Free Medicare counselors in every state. They can review your denial, help you write your appeal letter, and even represent you at a hearing. Find yours at shiphelp.org.
- Medicare Rights Center: Free helpline at 800-333-4114. Specializes in complex Medicare cases.
- Legal Aid Society: If your appeal involves a large amount, legal aid organizations in your state may represent seniors for free.
- Never ignore a denial — you have 120 days to appeal at Level 1
- Always ask your doctor for a medical necessity letter before appealing
- Keep copies of every document you send and receive
- Send appeals via certified mail with return receipt
- Call SHIP for free help — they know the system and dramatically improve success rates
- If Level 1 fails, keep going — reversal rates increase at higher levels
Frequently Asked Questions
How do I appeal a Medicare denial?
To appeal a Medicare denial, you must submit a Redetermination Request to the company that handles your Medicare claims within 120 days of receiving the denial notice. Include your Medicare number, the date of service, the reason you disagree, and any supporting documentation from your doctor.
How often are Medicare appeals successful?
Studies show that over 40% of Medicare Advantage claim denials are overturned on appeal. For Original Medicare, many denials result from billing errors or missing documentation that can be corrected on appeal. Most people who appeal receive at least partial reversal.
How long does a Medicare appeal take?
A Redetermination (Level 1 appeal) must be decided within 60 days for Original Medicare, or 72 hours for urgent care. Reconsideration (Level 2) takes 60 days. If you disagree with those results, you have three more levels of appeal including an Administrative Law Judge hearing.
Can I appeal a Medicare Advantage denial?
Yes — Medicare Advantage plans must follow Medicare's appeal process. For non-urgent appeals, decisions are required within 30 days. For urgent/expedited appeals (when delay could seriously harm your health), decisions are required within 72 hours. Your plan's denial letter must include appeal instructions.
What is a Medicare ABN notice?
An Advance Beneficiary Notice (ABN) is a notice a provider gives you before providing a service they think Medicare may not cover. By signing it, you agree to pay if Medicare denies coverage. You can still refuse the service or appeal the denial — signing an ABN does not waive your appeal rights.