Denied by Medicare? How to Appeal & Fight Back

Receiving a denial from Medicare for a healthcare service or treatment you expected to be covered can be frustrating and stressful. However, you have the right to appeal the decision. The Medicare appeals process is structured, and with the right approach, you can challenge a denial successfully. For the official government overview, see Medicare.gov's guide to filing an appeal.

How to appeal a Medicare claim denial

Here’s a step-by-step guide on how to appeal a Medicare claim denial and increase your chances of getting the coverage you need.

Step 1: Understand why your claim was denied

Before you begin the appeal process, carefully review the Medicare Summary Notice (MSN) you receive in the mail. This document explains why Medicare denied your claim. Many times, asking a Medicare Agent can help a lot with this identification. Common Medicare claim denial reasons include:

• The service is considered not medically necessary.

• Medicare does not cover the service.

• The claim contained errors, such as incorrect codes.

• The provider failed to submit proper documentation.

• A required prior authorization was not obtained before the service was performed.

Step 2: Gather supporting documentation

To strengthen your appeal, collect any relevant medical records, doctor’s notes, or supporting letters from your healthcare provider. These documents should clearly explain why the treatment or service is medically necessary for your condition.

Step 3: File your appeal (Level 1: redetermination)

You have 120 days from the date on your MSN to file an appeal. Here’s how:

• Complete a Redetermination Request Form (CMS-20027) or write a letter requesting a redetermination. For Part B specifically, this is the form people often search for as the “Medicare Part B redetermination form.”

• Include your Medicare number, the service or item in question, and a detailed explanation of why you believe Medicare should cover it.

• Attach copies of your supporting documents.

• Mail your request to the address provided on your MSN.

Step 4: Appeal to the reconsideration level (Level 2)

If your redetermination request is denied, you have 180 days to request a reconsideration by a Qualified Independent Contractor (QIC) — an outside reviewer that CMS uses to take a fresh look at your case:

• Complete the Reconsideration Request Form (CMS-20033) or submit a written request.

• Provide additional supporting evidence if possible.

• Mail it to the QIC address provided in your redetermination denial letter.

Step 5: Request a hearing with an Administrative Law Judge (ALJ) (Level 3)

If the QIC upholds the denial, you can escalate the appeal within 60 days by requesting a hearing before an Administrative Law Judge (ALJ), a federal judge who hears Medicare cases. This step is recommended if the denied claim involves a significant amount of money (at least $200 in 2026). This dollar figure is set by CMS and adjusted each year.

Step 6: Appeal to the Medicare Appeals Council (Level 4)

If the ALJ rules against you, you can take your case to the Medicare Appeals Council within 60 days. This level involves a more detailed review of your case but does not require a hearing.

Step 7: Federal Court review (Level 5, final step)

If you still don’t receive a favorable decision, and your claim meets the required amount ($1,960 in 2026), you can take your appeal to Federal District Court.

How to appeal a Medicare Advantage denial

Medicare Advantage plans run their own appeals process before the case ever reaches CMS. If your MA plan denies a service, treatment, or prescription, the first step is a plan-level reconsideration:

• You have 60 days from the date on the plan’s denial notice (the “organization determination”) to request reconsideration.

• If the plan upholds the denial, it must automatically forward your case to an Independent Review Entity (IRE).

• From the IRE forward, the process mirrors Original Medicare: ALJ hearing, Medicare Appeals Council, then federal court.

• For urgent care that can’t wait, ask for a fast (expedited) appeal. The plan has 72 hours to decide instead of the standard 30 days for pre-service requests.

The specific forms and mailing addresses come from your plan’s denial letter. Every Medicare Advantage plan is required to include them.

How to appeal a Part D drug plan denial

Part D denials follow a similar plan-first structure. You start by asking your drug plan for a coverage determination. If denied, the levels are:

• Level 1: Redetermination by the plan. You have 60 days from the denial to request it. Standard decisions come within 7 days; expedited within 72 hours.

• Level 2: Reconsideration by an Independent Review Entity.

• Levels 3-5: ALJ, Appeals Council, federal court, same as Original Medicare, with the same dollar thresholds.

If your doctor believes a non-formulary drug is medically necessary, they can submit a supporting statement alongside your appeal. That statement often decides Part D cases.

Do I have to pay while I appeal a Medicare denial?

Usually not, at least not right away. If you received a service and Medicare denied the claim, the provider may bill you, but you can ask them to hold billing while your appeal is active. If you signed an Advance Beneficiary Notice (ABN) before the service, you may owe the amount listed on that notice if the appeal fails. When there’s no ABN and the denial is later overturned, you generally aren’t responsible for the charge. Keep every bill and denial letter, and mark them clearly as under appeal.

Tips for a stronger Medicare appeal

• Act quickly. Each appeal level has strict deadlines, so don’t delay.

• Keep records. Save all correspondence, claim numbers, and decision letters.

• Get support. Your doctor, a Medicare agent, or a legal expert can help strengthen your case. Agents can help you understand the denial and organize your appeal, but they can't change Medicare's decision. Only the appeals process can do that. If your denial involves a Medicare Advantage plan, an agent who specializes in those plans can be especially valuable.

• Use free counseling. Your State Health Insurance Assistance Program (SHIP) offers free, unbiased help with Medicare appeals. No sales pitch, just local counselors trained on the process.

• Be persistent. Many denials are overturned at higher appeal levels. Understanding common Medicare mistakes can also help you avoid future issues.

An agent's perspective

Mark Bilgere

Bilgere Insurance • Bedford, TX

How long do Medicare appeals take?

There are several levels of Medicare appeals.

The first level appeal is a "Redetermination". This can take up to 60 days once Medicare receives your appeal.

The second level is a "Reconsideration". This can also take up to 60 days.

Next, the third level, is a "Hearing before an Administrative Law Judge". This is supposed to be 90 days, but a backlog of cases actually makes it longer. It could be months or a year.

The fourth level is a "Medicare Appeals Council Review". Again this is 90 days from receipt of the request.

Finally, the fifth level is going to "Federal District Court". This process could take months to years.

View all 20 answers »

Final thoughts: you can fight back

A Medicare denial doesn’t mean the end of the road. By understanding the reasons for the denial, gathering strong evidence, and following the structured appeals process, you can fight back effectively. Don’t hesitate to advocate for your healthcare rights. Medicare appeals exist to ensure you get the coverage you deserve.

If you need help navigating a denial or want a second opinion on your coverage options, find a licensed Medicare agent who can walk you through the process. You can also browse agents by state to connect with someone local who knows the plans and providers in your area.