How to Appeal a Medicare Coverage Denial

A Medicare denial can be confusing, especially when a bill arrives after treatment. The best response is to identify the decision, gather the right records, and follow the appeal deadline for your type of coverage.

What a Medicare denial means

A Medicare coverage denial means Medicare or a Medicare plan has decided not to pay for a service, item, or prescription under the applicable coverage rules.

It does not always mean the provider was wrong or that no appeal is available.

The first step is to identify who made the decision. Original Medicare, Medicare Advantage plans, and Part D drug plans use different notices and appeal procedures.

This guide focuses on Original Medicare appeals for Part A and Part B. If you have Medicare Advantage or Part D, follow the process and deadline stated in that plan's denial notice.

Find the decision in your Medicare Summary Notice

For Original Medicare, the Medicare Summary Notice, or MSN, explains how claims were processed. It identifies services, what Medicare paid, and amounts that may be billed to you.

An MSN is not a bill. Read the claim details to see whether Medicare denied payment, applied a deductible, or found that the service was not covered.

Compare the notice with the provider's bill. A billing-code error or missing information may sometimes be corrected by the provider without a formal appeal.

When to contact the provider first

Ask the billing office to review the claim, diagnosis codes, and supporting documentation. Confirm whether the provider submitted the claim to the correct payer.

If Medicare was billed incorrectly, the provider may be able to correct and resubmit the claim. Keep notes of who you spoke with and when.

If the denial reflects an actual Medicare coverage determination rather than a simple billing mistake, you may need to use the formal appeal process.

The five levels of Original Medicare appeals

Original Medicare has a multi-level appeal process. The first level is redetermination by the Medicare Administrative Contractor that processed the claim.

If you disagree with the first decision, later levels may include reconsideration by a Qualified Independent Contractor, a hearing before an administrative law judge or attorney adjudicator if the amount-in-controversy requirement is met, review by the Medicare Appeals Council, and federal court review when applicable requirements are met.

Each level has its own deadlines, documentation, and sometimes minimum disputed dollar amounts. The appeal notice should explain the next step.

First-level appeal: redetermination

For an Original Medicare claim, you generally have 120 days from receiving the Medicare Summary Notice to request a first-level redetermination.

Follow the instructions on the MSN and submit the required identifying information, the specific items you dispute, and a clear explanation of why you believe Medicare should cover them.

Include supporting medical records or a clinician's statement when relevant. Keep copies and proof of submission. See Medicare's official appeals instructions.

What evidence strengthens an appeal

A useful appeal explains the medical necessity of the service and connects it to Medicare's coverage requirements. A short statement that you disagree is usually less informative than specific facts.

Ask the treating clinician for relevant records, test results, treatment history, and an explanation of why the service was appropriate. Include the claim number and date of service.

Avoid sending unrelated records that obscure the issue. Organize documents so the reviewer can identify the denied service and the evidence supporting coverage.

If the first appeal is denied

Read the redetermination decision carefully. It should describe the reason for denial and how to request the next level of review.

Second-level reconsideration requests generally have a 180-day filing period from receipt of the redetermination decision, subject to the applicable rules.

Do not assume that a second review is automatic. Follow the notice's instructions and submit any additional evidence within the required time.

Appealing a Medicare Advantage denial

Medicare Advantage plans administer Medicare-covered benefits through private plan rules. A denial may involve prior authorization, an organization determination, or a payment dispute.

These plans have their own reconsideration and expedited review procedures. Time limits can be much shorter for decisions involving urgently needed care.

If the denial is from a Medicare Advantage plan, use the plan's official notice and Medicare's plan-appeal guidance rather than relying on the Original Medicare MSN process.

Part D prescription denials

A Part D plan may deny a drug because it is not on the formulary, requires prior authorization, or has another coverage restriction.

The process may begin with a coverage determination or exception request. Your prescriber may need to explain why a covered alternative is not appropriate.

Part D appeals have different timeframes, including expedited options for qualifying urgent cases. Follow the drug plan's written instructions.

A hypothetical Texas example

Imagine a Fort Worth beneficiary who receives outpatient imaging and later sees a denial on the MSN. The beneficiary believes the test was medically necessary.

First, the beneficiary checks with the imaging provider for coding or billing errors. If the claim was correctly submitted, the beneficiary gathers the physician's order and relevant records.

The beneficiary then requests a redetermination within the applicable deadline, identifying the specific denied service and the reason coverage should be reconsidered.

How to avoid missing a deadline

Open Medicare notices promptly and keep a folder for MSNs, bills, denial letters, and medical records. Record the date each notice was received.

If you need records from a provider, request them early. A pending records request does not necessarily extend the appeal deadline.

When the deadline is close, follow the official filing instructions and ask Medicare whether additional evidence can be supplied later.

Where to get help

Medicare can explain appeal rights and help identify the correct contractor or plan process. Your healthcare provider may be able to supply records or correct billing errors.

Texas Medicare beneficiaries can also seek counseling through HICAP. For complex or high-value disputes, legal assistance may be appropriate.

Keep private health information secure and use the contact information on official Medicare notices rather than unsolicited calls.

What an appeal letter should include

A first-level Original Medicare appeal should identify you, the Medicare claim or service, the date of care, and the specific decision you disagree with. State clearly why you believe the service meets Medicare coverage requirements.

Attach relevant physician orders, medical records, or other supporting documents. Explain how the evidence relates to the denied service rather than sending a generic statement that the treatment was important.

Use the filing address or instructions on your MSN or official appeal form. Keep a complete copy and proof of submission.

What if the care is urgent

A standard payment appeal for care already received differs from a request involving urgently needed treatment. Medicare Advantage and Part D have expedited review pathways for certain time-sensitive decisions.

If delay could seriously jeopardize health, contact the plan or Medicare immediately to ask about the applicable expedited process. Do not assume the normal Original Medicare claim-redetermination deadline is the only relevant rule.

A treating clinician can help explain why a faster decision is medically necessary. Follow the specific denial notice and plan instructions.

Frequently Asked Questions

Is a Medicare Summary Notice a bill?

No. It explains claim processing and may show services Medicare denied.

How long do I have to appeal an Original Medicare claim?

You generally have 120 days from receiving the MSN to request first-level redetermination.

Can my doctor help with an appeal?

Yes. Clinical records and a medical-necessity explanation can strengthen the request.

Can I appeal a Medicare Advantage denial the same way?

Not exactly. Medicare Advantage has a separate plan-based appeals process.

What if a prescription is denied?

Part D has its own coverage determination, exception, and appeal procedures.

What if my first appeal is denied?

You may request the next level of review within the deadline stated in the decision.

Can a billing error be fixed without an appeal?

Sometimes. Ask the provider to review coding and claim submission first.

Official sources

• Medicare appeal instructions
• Medicare appeals overview