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Medicare Denied Your Claim? How to Fight Back and Win Your Appeal

A denial letter from Medicare can feel final, but it rarely is. In many cases, you can challenge the decision and get it overturned—if you act quickly and follow the right steps.

Step 1: Read the Denial Letter Carefully

Start with the Medicare Summary Notice (MSN) if you have Original Medicare, or the Explanation of Benefits (EOB) if you’re in a Medicare Advantage or Part D plan. Look for:

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Reason code or explanation (for example: “not medically necessary,” “not a covered benefit,” “filed too late”).
Deadline to appeal (often 120 days from the MSN date for Original Medicare; Medicare Advantage and Part D plans may use shorter timelines).
Instructions for where and how to file an appeal.

Underline any unfamiliar terms and note the exact service, date, and provider involved.

Step 2: Confirm Coverage Rules

Before appealing, check:

Whether the service is normally covered by your part of Medicare (Part A, B, C, or D).
Whether you had any prior authorization, referral, or network requirements for a Medicare Advantage plan.
Whether the denial is about medical necessity, setting of care (inpatient vs. outpatient), or technical issues (incorrect coding, missing documents).

Technical errors can often be fixed quickly by your provider without a full appeal.

Step 3: Gather Supporting Evidence

Medicare appeals are stronger when backed by clear medical documentation. Ask your doctor or facility to provide:

A supporting letter explaining why the service was medically necessary.
Relevant office notes, test results, or hospital records.
Any guidelines or treatment standards they relied on.

Request that your doctor addresses the exact reason for denial using the language from your MSN or EOB.

Step 4: File Your First-Level Appeal on Time

For Original Medicare:

Use the Redetermination process.
Complete the appeal form listed on your MSN or write a letter that includes your name, Medicare number, the denied service, and a statement that you’re requesting a redetermination.
Attach copies (not originals) of your supporting documents.

For Medicare Advantage or Part D:

Follow the plan’s internal appeal process described in your denial notice.
For urgent issues (for example, needed medication), you can often request an expedited appeal.

Always keep copies of everything you submit and note the date you send it.

Step 5: Escalate If Necessary

If your first appeal is denied, you usually have multiple additional levels, which may include:

Reconsideration by an independent contractor.
A hearing with an Administrative Law Judge (for higher-dollar disputes).
Further review by the Medicare Appeals Council and, in some cases, federal court.

Each level has its own deadline and minimum-amount rules, so read every new decision letter closely.

Step 6: Get Help When You Need It

You don’t have to do this alone. You can:

Appoint a representative (family member, friend, attorney, or advocate) using Medicare’s representative form.
Contact your State Health Insurance Assistance Program (SHIP) for free, unbiased counseling.
Ask your provider’s billing or patient advocacy office to assist with records and explanations.

When Medicare denies a claim, the most important things you can do are move quickly, stay organized, and respond directly to the reason for denial. Many beneficiaries succeed on appeal once they supply clear medical support and follow the required steps.