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The Finance Base
Health Insurance

How to Appeal a Medicare Advantage Denial or Unexpected Bill

Appeal a Medicare Advantage denial through the plan using its notice and instructions. Learn the 65-day filing deadline, fast-appeal standard, later review levels and steps to investigate an unexpected bill.

By TheFinanceBase Team 5 min read
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If your Medicare Advantage plan denies coverage or payment, appeal through the plan using the instructions on its denial notice. In most cases, you have 65 days from the date on that notice to file the first appeal. If you have received a bill but no formal plan decision, first find out whether the claim was submitted and processed; a provider bill alone may not be a denial.

First, identify what kind of problem you have

A Medicare Advantage coverage decision is called an organization determination. The right next step depends on whether you are challenging a plan decision, trying to understand a bill, or complaining about how you were treated.

What happened Usual route
The plan refused to cover a service or item, or denied payment after you received it Appeal the plan’s organization determination. Medicare lists a bill for a claim already submitted as an appeal matter.
You disagree with the amount the plan says you owe Appeal the payment decision, and ask the plan and provider to explain how the amount was calculated.
You have a provider bill but cannot tell whether the plan has processed the claim Ask the provider whether it submitted the claim and request an itemized bill; check the claim status with your plan.
Your concern is care quality, customer service, access, or how the plan treated you File a complaint, also called a grievance, with the plan rather than treating the service problem alone as a coverage appeal.

These distinctions follow Medicare.gov’s guidance on Appeals in Medicare health plans, Get help with Medicare costs and File a complaint about your Medicare plan. A complaint does not replace an appeal when you are challenging a coverage or payment decision.

What to do about an unexpected bill

  1. Check the document. Determine whether it is a provider bill, an Explanation of Benefits or plan payment notice, or a formal denial. An amount on a bill is not, by itself, enough to establish why the plan did or did not pay.
  2. Ask the provider what was submitted. Request an itemized bill and ask whether the claim went to your Medicare Advantage plan. In-network doctors, suppliers and pharmacies usually submit claims directly to the plan, according to Medicare.gov’s general claims guidance.
  3. Check the plan’s records and your coverage details. Ask whether the claim has been received and processed, and review the plan notice, benefit terms, provider’s network status, and any authorization history. An unexpected amount might reflect cost sharing, a claim still being processed, a noncovered service, or another plan-specific issue; the bill alone cannot resolve which explanation applies.
  4. Request a formal decision if you need one. If the plan has not made a coverage or payment decision, ask the plan how to obtain an organization determination. If it has made an adverse decision, use the appeal instructions and deadline in its notice.
  5. Reconcile the amount with both parties. Contact the plan and provider to ask what the plan allowed, what it paid, and what amount the provider says remains due. Keep copies of bills, notices and any written replies.

Medicare.gov says that in most cases, when a plan directs a member to a plan provider for a covered service—or to an out-of-network provider without first getting an organization determination—the member does not pay more than the plan’s usual cost sharing. Whether that rule fits a particular bill depends on the circumstances, so ask the plan to explain its application to your care.

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Medicare’s general claims page describes rare situations in which someone may need to file a claim and recommends contacting the provider if no claim has been filed. That general guidance does not mean a Medicare Advantage member should use the Original Medicare Patient Request for Medical Payment form instead of following the plan’s appeal process.

How to file the first appeal

If the plan has already denied coverage or payment, request a level-1 reconsideration from the plan. Follow the denial notice and member materials for the correct address, filing method and instructions; those plan-specific directions control where and how to send your appeal.

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Protect the filing deadline

The general first-appeal deadline is 65 days from the date on the initial denial notice. Medicare.gov states that if you miss the deadline, you must give a reason for filing late. Check the notice for its date and instructions rather than counting from the day the bill arrived or the day you opened the letter.

Include information that helps the plan review the case

  • Your name, Medicare Number and contact information.
  • The service or item at issue and the relevant dates.
  • Why you disagree with the plan’s decision and what outcome you are asking for.
  • If someone is filing for you, that person’s details and proof of appointment where applicable.
  • Supporting material, such as a physician’s note or other records that address the plan’s reason for denying coverage or payment.

You can ask your doctor, provider or supplier for information that may support the appeal. A member, an appointed representative, a doctor or another health provider can file. For a service you have not yet received, your doctor may request reconsideration on your behalf and must notify you.

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Request a fast appeal only when delay creates a serious health risk

Ask for expedited review if waiting for a standard decision could seriously jeopardize your life or health, or your ability to regain maximum function. Explain the risk and connect it to the delay. An ordinary dispute over a bill does not automatically qualify for a fast appeal.

How long decisions and later appeal levels can take

Medicare.gov’s Appeals in Medicare health plans page gives the following general decision timeframes. The type of appeal matters; these are decision periods, not the 65-day filing deadline.

Appeal type General decision timeframe
Standard appeal before receiving a service 30 days
Standard appeal for payment after receiving a service 60 days
Part B drug appeal 7 days
Expedited appeal when the serious-health-risk standard is met 72 hours

Some timeframes may be extended by up to 14 days. The plan must explain an extension in writing and describe your right to object. If you receive an extension notice, read it for the stated reason and instructions.

If the plan upholds the denial

If the plan upholds all or part of its decision, it automatically forwards the appeal to an Independent Review Entity (IRE) for level 2 review. The IRE’s timeframes generally mirror the first level for the relevant appeal type, including the possibility of expedited review.

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If you disagree with the IRE’s decision, you generally have 60 days to request level 3 review by the Office of Medicare Hearings and Appeals (OMHA). For 2026, Medicare.gov lists minimum amounts of $200 for an OMHA hearing and $1,960 for judicial review in federal district court. Later levels have their own eligibility rules, notices and deadlines; follow the decision letter for the next step.

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Get free help or appoint someone to assist

Your State Health Insurance Assistance Program (SHIP) offers free, personalized local Medicare counseling funded by the federal government. A SHIP counselor can help you understand notices and navigate your options. Find local help through Medicare.gov’s Get help with Medicare costs page or by contacting Medicare.

You can appoint someone to help with your Medicare appeal using CMS-1696, the Appointment of Representative form. If you name a representative, include the required appointment information with the appeal and follow the plan’s instructions.

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