What Is an Advance Beneficiary Notice (ABN)?

An ABN, or Advance Beneficiary Notice of Noncoverage, is an important part of Original Medicare billing. It is used when a provider believes Medicare may not pay for a specific service or item and the patient needs to know about the possible cost before receiving it.

The notice explains why Medicare may deny the service, what the patient may have to pay, and gives the patient a choice about whether to continue.

What Is an ABN in Medical Billing?

An ABN, or Advance Beneficiary Notice of Noncoverage, is a notice given to a patient with Original Medicare when a provider believes Medicare may not pay for a specific item or service.

The notice is given before the service is provided. It explains what Medicare may not cover, why payment may be denied, and the estimated amount the patient may have to pay.

The purpose of an ABN is to make sure the patient understands the possible cost before deciding whether to receive the service. It does not mean Medicare has already denied the claim.

Why Is an ABN Used?

An ABN is used to make sure a Medicare patient knows in advance that a specific service or item may not be covered and that they could be responsible for the cost.

It helps the provider:

• Warn the patient before the service is provided
• Explain why Medicare may not pay
• Give an estimated cost
• Let the patient decide whether they still want the service
• Clarify who may be financially responsible if Medicare later denies the claim

The main purpose is to give the patient enough information to make an informed decision before receiving the service.

When Is an ABN Needed?

An ABN is generally needed when a provider has a reason to believe Original Medicare may not pay for a specific item or service and the patient may become responsible for the cost.

Common situations include:

• The service may not meet Medicare’s medical necessity requirements: For example, the diagnosis or clinical situation may not support coverage for the service being provided.
• The service exceeds a Medicare frequency limit: Some tests, preventive services, and other covered services can only be provided at certain intervals.
• Medicare coverage requirements are not expected to be met: This can apply in certain home health, hospice, or other coverage situations.
• Certain DMEPOS items may not qualify for Medicare payment: In specific situations involving durable medical equipment, prosthetics, orthotics, or supplies, an ABN may be required before the item is provided.

The ABN should be given before the service or item is provided, giving the patient enough time to understand the possible cost and decide whether they want to proceed.

What Information Is Included in an ABN?

An ABN should clearly tell the patient what service may not be covered, why Medicare may not pay, and what the patient may have to pay if they choose to continue.

The main information includes:

• Patient name: The name of the Medicare beneficiary receiving the notice
• Provider information: The name and contact details of the provider or supplier issuing the ABN
• Service or item: The specific test, treatment, service, or item that may not be covered
• Reason Medicare may not pay: A clear explanation of why coverage may be denied
• Estimated cost: A reasonable estimate of what the patient may have to pay
• Patient’s choice: The option the patient selects after reviewing the notice
• Signature and date: Confirmation that the patient received and understood the ABN before the service is provided

Simple Example of an ABN

Suppose a Medicare patient needs a lab test that Medicare normally covers, but the same test was performed recently and Medicare may not cover it again yet.

Before the test is done, the practice gives the patient an ABN explaining why Medicare may deny the claim and how much the test may cost.

The patient can then decide whether to go ahead with the test, knowing they may have to pay for it if Medicare does not cover it.

Common ABN Mistakes

These are the kinds of ABN mistakes that can realistically happen in day-to-day practice workflows:

• Giving the ABN too late, such as during checkout or after the service has already been provided
• Staff using an old or pre-filled ABN without updating the specific service, reason, or cost
• Writing a generic reason like “Medicare may not pay” instead of explaining the actual coverage concern
• Forgetting to include a reasonable estimated cost for the service
• Staff checking the patient’s option instead of allowing the patient to choose
• The patient signs the ABN, but the completed copy is not saved in the medical record
• The service listed on the ABN does not match the service that is eventually billed

Conclusion

An ABN helps Original Medicare patients understand when a specific service or item may not be covered and what they may have to pay if Medicare denies the claim. For practices, the key is to provide the notice at the right time, explain the reason clearly, include the estimated cost, and document the patient’s decision properly.

OneMed Billing can support your practice with Medicare billing, claim submission, denial management, payment posting, and other day-to-day revenue cycle tasks. Contact our team to discuss where you need billing support.