Do I have to sign the ABN?

No, you are not forced to sign an ABN. However, if you refuse to sign, your provider may choose not to provide the service or item. If they do provide it without a signed ABN, you might lose your appeal rights with Medicare and still be responsible for the full cost.

What happens if I don't sign the ABN?

If you don't sign the ABN, the provider might refuse to give you the service. If they still provide it, you could end up paying the full cost without the ability to appeal Medicare's decision. It's usually best to choose one of the options (A, B, or C) and sign the form to protect your appeal rights.

If I sign an ABN, will my Medigap plan pay?

Generally, no. Medigap plans, also known as Medicare Supplement Insurance, typically pay for costs that Medicare has approved but didn't cover fully, like deductibles or co-insurance. If Medicare denies a service as not medically necessary, your Medigap plan will likely also deny payment for that service.

Can I appeal if Medicare denies my claim after I signed an ABN?

Yes, if you chose Option A or B on the ABN form, you keep your right to appeal Medicare's decision. The ABN form itself provides instructions on how to start this appeal process. It's crucial to keep your copy of the signed ABN to support your appeal.

What if I think I was given an ABN incorrectly?

If you believe the service is medically necessary and should be covered by Medicare, discuss your concerns with your provider. If you still disagree, you can contact your local State Health Insurance Assistance Program (SHIP). They offer free, unbiased counseling to help Medicare beneficiaries understand their rights and options.

Your Choices Matter

What is a Medicare ABN Form and What Should I Do?

A Medicare Advance Beneficiary Notice (ABN) is a form from your doctor or supplier. It tells you that Medicare may not pay for a service or item. You sign it to show you understand and accept the potential cost.

By the ExplainMyBill.ai Editorial Team · Reviewed by our billing research team

Published June 5, 2026 · Updated June 5, 2026

What Exactly is an ABN?

An Advance Beneficiary Notice of Noncoverage (ABN) is a notice your healthcare provider gives you. This could be your doctor, a clinic, a lab, or a medical equipment supplier. It's a heads-up that Medicare may not cover a specific service or item you are about to receive.

The provider gives you this form because they believe Medicare might say the service isn't “medically necessary” or doesn't meet Medicare's coverage rules. It's not a bill, but a warning about potential costs before you get the service. The ABN allows you to make an informed decision: either accept the financial responsibility or choose not to receive the service.

Why You Might Receive an ABN

You typically receive an ABN when your provider has a good reason to believe Medicare won't pay for something. This doesn't mean the service is bad for you, just that it might not fit Medicare's specific coverage rules. Common reasons include:

It's important to remember that the ABN is about Medicare's coverage rules, not necessarily about whether the service is beneficial for your health.

The service or item is considered experimental or not yet proven.
Your doctor wants to provide a service more often than Medicare usually allows.
The service is not considered “medically necessary” by Medicare for your specific condition.
You are requesting a service that Medicare never covers, like cosmetic surgery (though ABNs are usually for services that *might* be covered but are likely to be denied).

Key Things to Look For on Your ABN Form

When you get an ABN, don't sign it immediately. Take a moment to read it carefully. Here's what you should pay close attention to:

After reviewing these points, you will need to choose one of three options on the form and sign it. Your signature means you understand your choices, not necessarily that you agree with Medicare's potential denial.

**Your Name and Medicare Number:** Make sure the form is for you and your correct information.
**The Specific Service or Item:** It should clearly describe what service or item Medicare might not cover.
**Reason Medicare May Not Pay:** This section should explain, in simple terms, why the provider thinks Medicare will deny payment.
**Estimated Cost:** The form must include an estimate of what you might have to pay if Medicare doesn't cover the service.
**Your Three Options (A, B, C):** These options let you decide how to proceed.

Understanding Your Choices on the ABN

The ABN form presents you with three distinct choices, usually labeled A, B, and C. Understanding these is crucial for your financial protection:

No matter which option you choose, always ask for a copy of the signed ABN for your records.

**Option A (I want the service):** You choose to receive the service or item. You agree to pay for it if Medicare denies payment. You keep your right to appeal Medicare's decision.
**Option B (I want the service, but I want Medicare to decide first):** You choose to receive the service or item. You want Medicare to make a formal payment decision. If Medicare denies it, you still agree to pay, and you keep your right to appeal.
**Option C (I do not want the service):** You choose not to receive the service or item. In this case, you will not be charged for it, and you will not have to appeal a Medicare decision.

What to Do After Receiving an ABN

Receiving an ABN can be confusing, but it's important to take specific steps to protect yourself and make the best decision:

An ABN helps you understand potential costs upfront. It gives you the power to decide if you want to move forward with a service that Medicare might not cover.

**Read Carefully and Ask Questions:** Don't sign anything you don't understand. Ask your provider to explain why they think Medicare won't pay and what the estimated cost covers.
**Consider Your Financial Situation:** Can you afford the estimated cost if Medicare denies the claim? If not, Option C might be the best choice.
**Make a Choice and Sign:** Select Option A, B, or C based on your decision. Your signature confirms you understand the situation.
**Keep a Copy:** Always get a copy of the signed ABN for your records. This is vital if you decide to appeal Medicare's decision later.

Frequently asked questions

Do I have to sign the ABN?: No, you are not forced to sign an ABN. However, if you refuse to sign, your provider may choose not to provide the service or item. If they do provide it without a signed ABN, you might lose your appeal rights with Medicare and still be responsible for the full cost.
What happens if I don't sign the ABN?: If you don't sign the ABN, the provider might refuse to give you the service. If they still provide it, you could end up paying the full cost without the ability to appeal Medicare's decision. It's usually best to choose one of the options (A, B, or C) and sign the form to protect your appeal rights.
If I sign an ABN, will my Medigap plan pay?: Generally, no. Medigap plans, also known as Medicare Supplement Insurance, typically pay for costs that Medicare has approved but didn't cover fully, like deductibles or co-insurance. If Medicare denies a service as not medically necessary, your Medigap plan will likely also deny payment for that service.
Can I appeal if Medicare denies my claim after I signed an ABN?: Yes, if you chose Option A or B on the ABN form, you keep your right to appeal Medicare's decision. The ABN form itself provides instructions on how to start this appeal process. It's crucial to keep your copy of the signed ABN to support your appeal.
What if I think I was given an ABN incorrectly?: If you believe the service is medically necessary and should be covered by Medicare, discuss your concerns with your provider. If you still disagree, you can contact your local State Health Insurance Assistance Program (SHIP). They offer free, unbiased counseling to help Medicare beneficiaries understand their rights and options.

This article is educational information, not medical, legal, or financial advice. Billing rules change and individual situations vary — always confirm details with your provider or insurer.