You have the right to appeal when Medicare denies a claim, and the process has multiple stages designed to give you a fair hearing

When Medicare denies payment for a service, test, or supply, you are not stuck with that decision. You can ask Medicare to look at it again through a formal appeal process. The appeal system has five levels, and most people resolve their cases at the first or second level without needing a lawyer or going to a hearing. The key is understanding which level applies to your situation and what paperwork you need to send.

Your first step is always to check the denial notice itself — the document Medicare sent you explaining why the claim was denied. This notice tells you exactly which level of appeal you are starting at and how much time you have to file. The time limit is usually 180 calendar days from the date on the notice, though some situations have different important date. Missing the important date means you lose your right to appeal that claim.

Key Takeaways

  • Your Medicare denial notice tells you which appeal level to start at and gives you 180 calendar days to file, so read it carefully and note the important date.
  • Level 1 (redetermination) is a request for Medicare to review the same claim again, and you submit it directly to the contractor listed on your notice.
  • Level 2 (reconsideration) asks an independent reviewer to look at your case if you disagree with the Level 1 decision, and it costs nothing to file.
  • Levels 3, 4, and 5 involve hearings and are rarely necessary, but they exist if your claim amount is high enough and you want to pursue it further.
  • You can represent yourself at any level, or you can have a doctor, family member, or attorney help you gather and submit evidence.

Understanding your denial notice and appeal rights

The denial notice you receive from Medicare (or from your Medicare Advantage plan if you are in one) is your roadmap. It includes the reason for the denial, the amount in question, and the appeal instructions specific to your situation. Read the reason carefully — it tells you what Medicare thinks went wrong. Common reasons include: the service was not medically necessary, the provider did not have the right credentials, the service is not covered under your plan, or the claim was submitted incorrectly.

The notice also tells you which appeal level you start at. Most people begin at Level 1 (called redetermination), but some situations — like appeals of decisions made by a Medicare Advantage plan — may start at a different level. The important date to file is printed on the notice. If you miss it, you lose your appeal rights for that claim unless Medicare grants you an extension, which is rare. Mark the important date on your calendar and file before it arrives.

You have the right to appeal on your own, or you can have someone help you. That person can be a family member, your doctor, a patient advocate, or an attorney. If you use an attorney, they can charge you a fee only if you win the appeal and recover money — and Medicare limits what they can charge. You do not need to hire anyone to appeal successfully.

Level 1: Requesting redetermination from Medicare

Redetermination is Medicare's first review of your claim. You are asking the same contractor who made the original decision to look at it again, usually with new information or a clearer explanation of why the service should have been covered. This level costs nothing and takes about 30 days, though it can take longer if your case is complex.

To request redetermination, contact the Medicare contractor listed on your denial notice. The notice tells you how to file — usually by mail, phone, fax, or online portal. You do not need a special form; a letter explaining why you think the denial was wrong is enough. However, the real power of redetermination is the evidence you include. Gather documents that support your case: a letter from your doctor explaining why the service was medically necessary, records showing the provider was may have access to, proof that the service is covered under your plan, or documentation that the claim was submitted correctly. The stronger your evidence, the more likely Medicare will reverse the denial.

Write a clear, factual letter. Explain what service was denied, when it was provided, and why you believe it should have been covered. Reference the specific reason given in the denial notice and explain why that reason does not explore. For example, if Medicare said the service was not medically necessary, explain the medical condition that made it necessary and include your doctor's statement. Keep copies of everything you send.

Level 2: Requesting reconsideration if redetermination fails

If Medicare denies your redetermination request, you can ask for a reconsideration. This time, an independent reviewer — someone who had no part in the original decision — looks at your case. Reconsideration also costs nothing and usually takes 60 days. You have 180 calendar days from the date of your redetermination denial to file.

Request reconsideration from the same Medicare contractor. Again, you do not need a special form. Write a letter explaining why you disagree with the redetermination decision and include any new evidence that strengthens your case. This is your chance to add information you did not have before, or to explain more clearly why the original reason for denial does not explore. If your doctor can write a more detailed letter about medical necessity, this is the time to include it.

The reconsideration reviewer will look at the entire file — the original claim, the denial reason, your redetermination request, and any new evidence you submitted. They are not bound by the first decision and can reverse it if they find the evidence supports coverage. Many denials are overturned at this level because the independent reviewer takes a fresh look at the facts.

Levels 3, 4, and 5: Hearings and appeals council review

If your claim is for a large amount of money and you still disagree after reconsideration, you can request a hearing before an administrative law judge (Level 3). This requires that your claim be for at least $200 (the threshold amount, which may change). At a hearing, you present your case to a judge who listens to evidence and makes a decision. You can do this by phone or in person, and you can bring witnesses or have someone represent you.

Level 4 is an appeal to the Medicare Appeals Council if you lose at the hearing. Level 5 is federal court, which is rare and requires an attorney in most cases. The vast majority of Medicare denials are resolved at Levels 1 or 2, so most people never reach a hearing. However, these levels exist if your case is significant enough to pursue further.

Gathering evidence that supports your appeal

The strongest appeals include medical evidence, provider credentials, and plan documents. Start by asking your doctor for a detailed letter explaining why the service was medically necessary for your specific condition. The letter should reference your medical history, test results, symptoms, or other treatments you tried first. A generic letter saying "this service was necessary" is weaker than one that explains the medical reasoning.

If the denial was about provider credentials, gather proof that your provider was may have access to — a copy of their license, board certification, or network status. If the denial was about coverage, request a copy of your plan's coverage rules for that service from your insurance company or Medicare. If the claim was submitted incorrectly, ask your provider or the billing department to explain what was wrong and how it should have been submitted.

Keep a file with copies of everything: the original claim, the denial notice, your appeal letters, supporting documents, and any responses from Medicare. This file becomes your evidence if you move to a higher appeal level. Do not send originals — always send copies and keep the originals for your records.

What to do while your appeal is pending

While Medicare reviews your appeal, you are not responsible for paying the bill if you followed the correct process. However, your provider may send you a bill or collection notice. If this happens, tell the provider that you have filed an appeal and ask them to hold off on collection while the appeal is pending. Many providers will do this, especially if you show them a copy of your appeal request.

If your provider continues to bill you, you can file a complaint with your state's insurance commissioner or with Medicare directly. Document all bills and collection notices you receive. If Medicare eventually overturns the denial, the provider is responsible for the bill, not you, and any payments you made should be refunded.

Continue to pay any bills you are clearly responsible for — such as copayments or coinsurance for covered services — while your appeal is pending. The appeal is only about whether the service should have been covered at all, not about the cost-sharing amounts you owe for covered services.

Frequently Asked Questions

How long does a Medicare appeal take?

Redetermination usually takes about 30 days. Reconsideration takes about 60 days. These are standard timeframes, but complex cases can take longer. Medicare will send you a notice when a decision is made. If you do not hear back within the stated timeframe, contact the contractor to check on the status.

Can I appeal a Medicare Advantage plan denial the same way?

Medicare Advantage plans follow similar appeal rules but may have slightly different processes. Your denial notice will explain the steps specific to your plan. You can also contact your plan's customer service line to ask how to appeal. The first level is usually called an internal appeal rather than redetermination, but the concept is the same.

What if I disagree with the appeal decision?

If redetermination is denied, you can request reconsideration. If reconsideration is denied and your claim is for $200 or more, you can request a hearing. You have 180 calendar days from each denial notice to file the next level of appeal. The important date is strict, so file before it passes.

Do I need a lawyer to appeal a Medicare denial?

No. Many people win appeals without a lawyer by gathering strong medical evidence and writing a clear explanation of why the denial was wrong. A lawyer can help if your claim is large or the case is complex, but it is not required. If you do hire a lawyer, they can only charge you if you win and recover money.

What if Medicare denies my appeal at every level?

If you have exhausted all five levels and still disagree, you have the right to file a complaint with your state's insurance commissioner or with the Centers for Medicare and Medicaid Services (CMS). You can also contact your state's Patient Advocate Foundation or a local legal aid office for help. Some denials stand because the service truly is not covered, but others are reversed after persistence and strong evidence.