If you’ve spent any time working with Medicare patients, you’ve likely encountered the Advance Beneficiary Notice of Noncoverage (ABN). Unfortunately, it’s also one of the most misunderstood forms in healthcare.

Some practices present ABNs for nearly every diagnostic test, while others avoid them altogether because they’re unsure when they’re appropriate. Both approaches can create compliance and revenue risks. Understanding when an ABN is required, when it isn’t, and how to properly present it can help protect both your practice and your patients.

What Is an ABN?

An Advance Beneficiary Notice of Noncoverage (ABN) is a Medicare form used to notify a beneficiary that Medicare is expected to deny payment for a particular service because it may not meet Medicare’s coverage requirements, most commonly due to a lack of medical necessity. The ABN allows the patient to decide whether to proceed with the service and accept potential financial responsibility before the service is performed.

The key word here is advance. The ABN is intended to ensure the patient is informed before receiving a service that Medicare may not cover.

When Should an ABN Be Used?

An ABN should be used when the provider believes Medicare is likely to deny coverage for a service that would otherwise be a Medicare-covered benefit. Common reasons include:

• The service may not meet Medicare’s medical necessity requirements.
• The patient exceeds Medicare frequency limitations.
• Documentation does not support coverage criteria.
• The provider expects Medicare to deny the service based on previous experience or coverage guidelines.

In optometry, situations that frequently trigger ABN consideration include:

• OCT testing
• Fundus photography
• Visual field testing
• Pachymetry
• Certain repeat diagnostic procedures

The mere fact that a test is performed does not justify Medicare coverage. Coverage depends on the patient’s diagnosis, symptoms, findings, and medical necessity.

An ABN Is Not Required for Everything

One of the most common misconceptions is that an ABN should be used whenever a service is not covered. That’s not actually the purpose of the form.

Medicare generally requires the ABN when a service may be denied for not being considered medically necessary. However, services that are not covered by Medicare typically do not require an ABN. Medicare does encourage providers to voluntarily notify patients of their financial responsibility in these situations, but the mandatory ABN requirements are different. For optometric practices, this distinction is important.

For example:

• A routine vision examination is not covered by Medicare.
• Refractions are not covered by Medicare.
• Most eyewear is not covered except in limited circumstances.

While many practices provide financial notices for these services, they are not the same as using an ABN because Medicare medical necessity is not the issue.

When Should the ABN Be Presented?

This is where many practices have questions. A common concern is whether the ABN must be signed before the patient’s examination begins.

The answer is: Not necessarily.

Medicare requires that the ABN be presented before the potentially non-covered service is provided, with sufficient time for the patient to make an informed decision.

Scenario 1: You Know Before the Exam – If pretesting, scheduling information, or a review of records indicates a diagnostic procedure is likely to require an ABN, presenting it before the examination is often the most efficient approach.  This prevents delays and ensures the patient understands the potential financial responsibility before moving through the visit.

Scenario 2: The Doctor Decides During the Exam – This situation occurs frequently in optometry. A patient arrives for an exam. During the encounter, the doctor identifies a finding that warrants additional testing. Before the test is performed, the team determines Medicare may not cover the procedure. In this case, it is entirely appropriate to present and obtain the ABN at that point. The examination may have already begun, but the diagnostic test has not yet been performed. The ABN is still being delivered in advance of the service.

Scenario 3: A Test Leads to Another Test – Let’s use a common example. You ordered and completed an OCT, which shows a potential change in the optic nerve.  You wants to confirm the change with a visual field test, but you have already billed for visual field testing at the frequency limitation specified in the payer’s Medical Directive.  You can still run the test based on determination of medical necessity, but you might consider an ABN in case the visual field is denied under frequency limitation.

Just make sure you provide the ABN before providing the service that may be denied.

Common ABN Mistakes

Even well-run practices occasionally make ABN mistakes. Some of the most common include:

Using an ABN “just in case”: ABNs should not become a routine form handed to every Medicare patient. There should be a clear reason the practice expects Medicare may deny coverage.

Obtaining the ABN after the service: Once the test has been performed, it’s too late. The ABN must be presented before the service is furnished.

Incomplete forms: Missing signatures, missing estimated costs, or incomplete descriptions can create problems if the claim is denied and financial liability is questioned.

Assuming every non-covered service requires an ABN: Many non-covered services do not require a mandatory ABN because Medicare never covers them in the first place. Understanding this distinction helps reduce unnecessary paperwork.

The standard CMS ABN is often not applicable for Medicare Advantage plans: These plans tend to have their own ABN form that must be used.  These should be available on the payer website.

The Bottom Line

The ABN is an important communication and compliance tool, but it should be used thoughtfully.

Ask yourself three questions:

• Is this a Medicare-covered benefit under the right circumstances?
• Do I have reason to believe Medicare may deny this service?

If the answer to both is yes, an ABN is likely appropriate. Then make sure to present it to the patient before providing the service.

For optometric practices, the goal is not to collect more ABNs. The goal is to use them correctly, ensuring patients are informed, expectations are clear, and the practice is protected when Medicare coverage is uncertain.

Disclaimer: This article is intended for educational purposes only and should not be considered legal, compliance, or billing advice. Providers should refer to current CMS guidance, Medicare Administrative Contractor policies, and their compliance advisors when making billing and documentation decisions.

if you have questions reach out at info@PracticePerformancePartners.com.

The Advance Beneficiary Notice of Noncoverage (ABN), Form CMS-R-131 can be found here: https://www.cms.gov/medicare/forms-notices/beneficiary-notices-initiative/ffs-abn