What happens when you appeal a Medicare claim

When Medicare denies a claim or pays less than you expected, you can ask them to review that decision. An appeal is a formal request to Medicare to look at the claim again and reconsider whether they should pay it. You do not need a lawyer, and there is no cost to file one.

The appeal process has five levels, but most claims are resolved at level one or two. At each level, you have a set window of time to submit your request — usually 180 days from the date on the decision letter. Missing that important date closes the door on that level, though you can sometimes move forward to the next one instead.

Medicare will tell you in the decision letter which level you are starting at. If your claim was processed by a private insurance company on Medicare's behalf (called a Medicare Advantage plan), the appeal process is different and faster — contact your plan directly rather than Medicare.

Key Takeaways

  • You have 180 days from the date on your denial letter to file an appeal at the first level, and missing this important date usually closes that level permanently.
  • Level one appeals go back to the same contractor who denied the claim; level two and beyond go to independent reviewers with no connection to the original decision.
  • You must include the claim number, the date of service, and a clear explanation of why you believe Medicare should pay — vague disagreement will not move the claim forward.
  • If your claim is under $200, you can skip levels two and three and go straight to a hearing officer at level four.
  • Medicare Advantage plans have their own appeal process and timelines; check your plan documents or call the number on your card.

Level one: Redetermination by the original contractor

A level one appeal asks the same Medicare contractor who denied your claim to look at it again. This is the fastest route and the one most likely to succeed if there was a straightforward error — a missing document, a typo in your diagnosis code, or a misunderstanding about what service you received.

To file, write a letter or use the appeal form (CMS-20027) and send it to the address on your denial letter. Include your name, Medicare number, the claim number, the date of service, and a brief explanation of why you think Medicare should pay. If you have new information — a corrected medical record, a letter from your doctor, a receipt you found — include it now. You have 180 days from the date on the denial letter.

Medicare will respond within 30 days. If they agree, they will reprocess the claim. If they deny it again, they will send you a new letter explaining why and telling you how to move to level two.

Level two: Reconsideration by an independent contractor

If level one fails, level two sends your claim to a different contractor with no connection to the original decision. This reviewer will look at the entire file from scratch. You have 180 days from the date of the level one denial letter to request this.

File the same way as level one — letter or form CMS-20027 — to the address listed in the level one denial letter. Repeat your explanation and include any additional evidence. This stage usually takes 60 days, though it can stretch longer if Medicare needs more information from your doctor.

If the independent contractor agrees, the claim is paid. If they deny it, you move to level three, and the denial letter will explain how.

Level three: Administrative Law Judge hearing (if your claim is $200 or more)

At level three, an Administrative Law Judge (ALJ) reviews your case. This is a real hearing, though it usually happens by phone or video rather than in person. You can represent yourself or bring someone to help — a family member, a patient advocate, or a lawyer.

You have 180 days from the level two denial to request this hearing. File using form CMS-20034 and send it to the address in the level two letter. In the request, explain why you disagree with the previous decisions and include any new evidence.

Medicare will schedule a hearing date and send you a notice. You will speak to the judge, present your case, and answer questions. The judge will issue a written decision within 90 days. If the claim is under $200, you cannot use level three — you skip to level four instead.

Level four: Appeals Council review

The Appeals Council is a panel that reviews decisions from Administrative Law Judges. You have 60 days from the ALJ decision to request this review. File using form CMS-20035 and explain why you think the judge's decision was wrong.

The Appeals Council may uphold the decision, reverse it, or send it back to the judge for another hearing. They will send you a written decision. This level is less common — most people either win at level three or decide to stop.

Level five: Federal court

If the Appeals Council denies your claim, you can file a lawsuit in federal court. This is rare and requires a lawyer in most cases. You must have a claim of at least $1,500 and file within 60 days of the Appeals Council decision.

Federal court is expensive and slow. Most people do not reach this level. If you are considering it, talk to a lawyer who handles Medicare cases first.

What to include in every appeal

No matter which level you are at, your appeal letter or form must contain certain information or Medicare will reject it. Start with your full name and Medicare number at the top. Include the claim number from the denial letter, the date of service, and the amount Medicare denied or underpaid.

Write a clear, short explanation of why you think Medicare should pay. Do not just say "I disagree." Instead, explain the specific reason: "My doctor states this service was medically necessary because..." or "The denial letter says the service was not covered, but my plan covers this procedure for my condition..." or "The claim was denied because of a missing document, which I am now including."

Attach copies of any supporting documents: medical records, receipts, letters from your doctor, the original denial letter, or anything else that backs up your case. Do not send originals — always keep those. Sign and date the letter, and keep a copy for your records.

Where to send your appeal

The address changes depending on which level you are appealing to and who processed your original claim. The denial letter always lists the correct address for the next step. If you cannot find it, call the number on your Medicare card or visit Medicare.gov and search for "appeals."

You can mail the appeal, fax it, or in some cases submit it online through your Medicare account. Mailing is the safest option because you can get proof of delivery. Use certified mail with return receipt so you have evidence the appeal arrived.

Frequently Asked Questions

Can I appeal while I am still paying the bill?

Yes. You do not have to wait until the bill is paid or sent to collections. In fact, filing an appeal early can sometimes stop a bill from being sent to a collection agency. Keep paying your regular Medicare premiums while the appeal is pending.

What if I missed the 180-day important date?

If you missed the important date for a particular level, that level is usually closed. However, you may still be able to move to the next level if you file within the important date for that one. Call Medicare at 1-800-MEDICARE to ask whether your case can move forward.

Do I need a lawyer to appeal?

No. Most level one and two appeals succeed without a lawyer. You only need one if you reach level three (a hearing) and feel uncomfortable representing yourself, or if you are considering federal court. Many lawyers who handle Medicare cases work on contingency, meaning they take a percentage of what they recover instead of charging upfront.

How long does an appeal take?

Level one usually takes 30 days. Level two takes 60 days or longer. Level three (a hearing) can take several months from request to decision. The timeline depends on how busy the contractor or judge is and whether Medicare needs more information from your doctor.

What if Medicare says the service was not covered under my plan?

If the denial is based on your plan's coverage rules, you can still appeal, but your argument needs to address the coverage question directly. For example, if Medicare says the service requires prior authorization and you did not get it, explain why you believe it should have been authorized or why the lack of authorization should not block payment. If you believe the plan's coverage rules are wrong, you can also file a complaint with your state insurance commissioner.