How to Appeal a Denied Medicare Claim

How to Appeal a Denied Medicare Claim
  • Last Updated April 24, 2026


If you receive a denial for a Medicare claim, you have the right to appeal the decision. The process can feel overwhelming, but with the right steps and information, you can effectively challenge it. This guide walks you through each stage of the Medicare appeals process. Claim denials are one of the most common Medicare mistakes that catch beneficiaries off guard, so knowing your options matters.

Understanding Your Denial

The first step in the appeal process is to thoroughly understand why your claim was denied. You will receive a Medicare Summary Notice (MSN) every three months, which details the services and items billed to Medicare, the amount Medicare paid, and what you may owe the provider. The MSN will also indicate if any claims were denied and the reasons for those denials.

Common reasons for denial include:

  • Services not covered: Medicare does not cover all types of healthcare services. Many beneficiaries are surprised by the gaps in Original Medicare coverage.
  • Medically unnecessary: The service or item is deemed not medically necessary.
  • Incorrect coding: Errors in the billing codes used by your healthcare provider.

Diana Garner

American Senior Benefits • Hartford, KY

Why did I receive a Medicare Summary Notice, and what should I do with it?

The Medicare Summary Notice was sent to you because you are on Medicare, and services and/or supplies were provided to you during that period. It is not a bill, so don't stress over that.

You should receive one at least every 4 months and review it for accuracy. Look for errors or potential fraud. If you do find an error, you can file an appeal by following the instructions on the back of the notice.

Step-by-Step Guide to Appealing a Medicare Denial

Step 1: Gather Information and Prepare Your Appeal

  • Review Your MSN: Carefully examine the section of the MSN that explains why your claim was denied.
  • Contact Your Provider: Speak with your healthcare provider to ensure that the services were billed correctly. Sometimes, a simple coding error can be corrected and resubmitted without needing a formal appeal.
  • Collect Supporting Documents: Gather any relevant documents, such as medical records, doctor's notes, and any correspondence with your provider that supports your case.

Step 2: File a Redetermination Request

A redetermination is the first level of appeal. You must request this within 120 days of receiving your MSN.

  • Complete the Form: Fill out a "Redetermination Request Form" (CMS-20027) or write a letter. The form and instructions can be found on the Medicare website or by contacting Medicare directly.
  • Include Key Information: In your request, include your name, address, Medicare number, the items or services you are appealing, the dates of service, and a detailed explanation of why you believe the denial is incorrect.
  • Submit Your Request: Mail the completed form or letter to the address provided on your MSN. Make sure to keep copies of all documents for your records.

Alyssa Gonzales

The Gonzales Agency • San Antonio, TX

How do I appeal a decision by Medicare or my plan if they deny coverage for a procedure or medication I need?

Don’t panic! You’ve got the right to appeal. Start by reading the denial letter, then follow the instructions to file a Level 1 appeal, usually just a simple form and a doctor’s note explaining why the service is medically necessary. A whopping 81.7% could be fully or partially overturned(Kaiser).

Step 3: Await the Decision

After submitting your redetermination request, the Medicare Administrative Contractor (MAC) will review your case. They typically respond within 60 days.

  • Decision Notification: You will receive a letter explaining the outcome of the redetermination. If your appeal is successful, the covered services or items will be listed in your next MSN.

Step 4: Further Levels of Appeal

If the redetermination decision is not in your favor, you can proceed to the next levels of appeal:

  1. Reconsideration by a Qualified Independent Contractor (QIC): Request within 180 days of the redetermination decision.
  2. Administrative Law Judge (ALJ) Hearing: If the amount in question meets the threshold ($180 in 2024), you can request a hearing within 60 days of the QIC decision.
  3. Medicare Appeals Council (MAC) Review: Request within 60 days of the ALJ decision.
  4. Federal District Court: For claims exceeding a certain amount ($1,760 in 2024), you can file a lawsuit within 60 days of the MAC decision.

Tips for a Successful Appeal

  • Be Thorough and Precise: Ensure your appeal includes all necessary information and supporting documentation.
  • Meet Deadlines: Pay close attention to the time limits for each level of appeal to avoid missing your chance to contest the decision.
  • Seek Assistance: Consider enlisting help from your doctor, a legal advisor, or a Medicare counselor. Programs like the State Health Insurance Assistance Program (SHIP) offer free counseling and assistance with Medicare appeals.
  • Expedited Appeals: If waiting for a standard appeal decision could seriously jeopardize your health, you can request an expedited (fast) appeal. This request should be made directly to your plan provider. Beneficiaries with Medicare Advantage plans should contact their plan directly for expedited review.

Resources for Help

  • Medicare.gov: The official Medicare website provides detailed information and resources about the appeals process.
  • 1-800-MEDICARE (1-800-633-4227): Call for assistance and guidance on Medicare appeals.
  • State Health Insurance Assistance Program (SHIP): SHIP offers free, personalized counseling and support to Medicare beneficiaries.

Real-Life Example

Consider the case of Joan, a Medicare beneficiary who had a claim denied for a medically necessary MRI scan. Joan's doctor provided a letter explaining the medical necessity of the MRI, and she included this letter in her redetermination request. By clearly explaining her situation and providing comprehensive documentation, Joan successfully appealed the denial and Medicare covered the cost of her MRI.

By understanding and following these steps, you can navigate the Medicare appeals process with confidence. Persistence and attention to detail are key to successfully overturning a denial and ensuring you receive the coverage you are entitled to. If you need personalized guidance, consider connecting with a licensed Medicare agent in your area who can help you understand your options.

For more detailed information and to access the necessary forms, visit Medicare's official appeals page.