What to Do When Medicare Won't Cover Your Treatment

You received treatment Medicare doesn't cover — here's what happens next

When a doctor provides treatment that Medicare does not cover, you are responsible for the full cost unless you have other insurance or the provider agrees to write off the bill. Medicare will not retroactively pay for it, and you cannot appeal the decision based on medical need alone. What you can do depends on whether you knew in advance that Medicare would not cover it, whether the provider told you, and what type of treatment it was.

The key distinction is advance notice. If your doctor told you in writing before the service that Medicare would not cover it, you made an informed choice and the bill is yours. If they did not tell you, or told you verbally, Medicare may require them to absorb the cost instead. Understanding this difference is the first step to knowing whether you owe the money.

Key Takeaways

If your provider gave you written notice before treatment that Medicare would not cover it, you are responsible for the full bill.
If your provider did not give advance written notice, Medicare may require them to refund you or write off the charge.
Request an Advance Beneficiary Notice (ABN) in writing from your provider before any service you think Medicare might not cover.
You have the right to dispute a bill through Medicare's appeals process, which begins with a written request to your provider.
If you cannot pay, contact your provider's financial counselor or a local legal aid office — many providers have hardship programs.

When the provider should have given you written notice

Medicare requires doctors and hospitals to give you an Advance Beneficiary Notice (ABN) before providing a service they believe Medicare will not cover. The ABN must be on a specific form (CMS-R-131), must explain why they think Medicare will deny it, and must tell you the estimated cost. You sign it to confirm you understand the risk.

If your provider did not give you this form in advance, they cannot legally bill you for a service Medicare denies. Instead, Medicare will instruct them to refund you or write off the charge. This is true even if the service turned out to be medically necessary — the rule exists to protect you from surprise bills.

The ABN must be given before the service, not after. A verbal warning does not count. If your doctor said "Medicare probably won't cover this" but did not hand you a signed form, you have grounds to dispute the bill.

How to learn about you actually owe the bill

Start by requesting an itemized bill from your provider. This bill should show what was done, the date, the charge, and whether Medicare was billed. Contact your provider's billing department in writing and ask for a copy of any ABN they gave you before the service.

Next, check your Medicare Summary Notice (MSN) or your online Medicare account at Medicare.gov. The MSN shows what Medicare was billed for, what Medicare paid, and what Medicare denied. If Medicare denied the service, the notice will say why — for example, "not medically necessary" or "not a covered service."

If you received an ABN and signed it, you owe the bill. If you did not receive an ABN, or if the ABN was given to you after the service, contact your provider in writing and ask them to refund you or submit the bill to Medicare again with a note that no advance notice was given.

Disputing the bill through Medicare's appeals process

You have the right to ask Medicare to reconsider its denial. This process is called an appeal, and it begins with a written request to your provider, not to Medicare directly. Write to the billing department and ask them to file a redetermination — the first level of appeal. Include a copy of your Medicare Summary Notice and explain why you believe the service should have been covered.

Your provider has 120 days from the date Medicare denied the claim to file this request on your behalf. If they refuse, you can file it yourself by contacting Medicare directly at 1-800-MEDICARE or through your online account.

The redetermination process takes about 30 days. Medicare will review the medical records and the reason for denial. If Medicare agrees the service should have been covered, they will pay the provider and you owe nothing. If Medicare stands by the denial, you can move to the next level of appeal, though this is rare for truly non-covered services.

What to do if you cannot pay the bill

Contact your provider's financial counselor or patient advocate before the bill goes to collections. Many hospitals and large practices have hardship programs, payment plans, or charity care funds. Explain your situation and ask what options exist. Some providers will reduce or forgive the bill if you demonstrate financial hardship.

If your provider will not negotiate, contact your state's legal aid office or a local consumer law clinic. Many offer free help disputing medical bills. You can find legal aid through the Legal Services Corporation website or by calling 211 and asking for legal aid in your area.

Do not ignore the bill. If it goes to a collection agency, it will damage your credit and the collector can sue you. Acting early — before the debt is sold — gives you more leverage to negotiate.

Common situations where coverage disputes happen

Experimental or investigational treatments: Medicare covers some clinical trials but not others. If your doctor recommends a trial, ask in writing whether Medicare will cover it. If they say no, request an ABN before you enroll.

Treatments deemed not medically necessary: Medicare may deny a service because it believes it is not necessary for your condition, even if your doctor recommended it. This is one of the most common denials. You can appeal by submitting medical records that support the need, but Medicare's decision is often final.

Services from out-of-network providers: If you see a doctor who does not accept Medicare, Medicare will not cover the visit. Some providers will bill you directly; others will bill Medicare and let you know you owe the difference. Always confirm in advance whether a provider accepts Medicare.

Cosmetic or elective procedures: Medicare does not cover facelifts, teeth whitening, hearing aids (with limited exceptions), or other elective services. These are almost never covered, and providers usually tell you this upfront.

Preventing surprise bills in the future

Before any service, ask your doctor directly: "Does Medicare cover this?" If they are unsure, ask them to check with Medicare or to give you an ABN. Do not accept a verbal answer. Request the ABN in writing and keep a copy for your records.

If you have a supplemental insurance plan (Medigap) or a Medicare Advantage plan, ask whether that plan covers the service if Medicare does not. Some Medigap plans cover certain services Medicare denies, though this is rare. Medicare Advantage plans have their own coverage rules and may cover or deny differently than Original Medicare.

Keep all paperwork: the ABN, the bill, the Medicare Summary Notice, and any correspondence with your provider. If a dispute arises, these documents prove what you were told and when.

Frequently Asked Questions

Can I sue my doctor for not telling me Medicare wouldn't cover the treatment?

You cannot sue for the bill itself, but you may have grounds to dispute it through Medicare's process. If your provider failed to give you an ABN and billed you for a denied service, Medicare will typically require them to refund you. If they refuse, contact your state's medical board or attorney general's office to file a complaint.

What if I signed the ABN but didn't understand what it meant?

Signing the ABN means you understood the risk and chose to proceed. However, if the provider did not explain it clearly or gave it to you in a language you do not speak fluently, you may have grounds to dispute the bill. Contact your provider in writing and explain the language barrier or lack of explanation.

Does Medicare Advantage cover things Original Medicare doesn't?

Sometimes. Medicare Advantage plans set their own coverage rules within Medicare's framework. A service denied by Original Medicare might be covered by your Advantage plan, or vice versa. Check your plan's coverage document or call your plan's customer service line before the service.

How long do I have to dispute a bill?

You can dispute a bill at any time, but the sooner you act, the better. If the bill goes to a collection agency, your options narrow. For Medicare appeals, you generally have one year from the date of service to request a redetermination, though acting sooner is always safer.

What if the provider says they already submitted the bill to Medicare and it was denied?

Ask for a copy of the Medicare Summary Notice showing the denial. Review the reason Medicare gave. If you believe Medicare made an error, you can file an appeal. If the reason is that the service is not covered by Medicare at all, an appeal is unlikely to succeed, but you still have the right to try.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.