Last updated October 18, 2026

Understanding Advance Beneficiary Notices (ABNs) | Coding Clarified

Understanding Advance Beneficiary Notices (ABNs)

By By Janine Mothershed

Understanding Advance Beneficiary Notices (ABNs): Guidelines for Accurate Medical Coding

In medical billing and coding, the Advance Beneficiary Notice (ABN) is a crucial tool. Healthcare providers use it to inform patients about their financial responsibilities for certain medical services. This document becomes particularly important when Medicare or other insurers might not cover services. Understanding and implementing ABN guidelines is essential for ensuring compliance and avoiding claim denials.

What is an ABN?

An Advance Beneficiary Notice (ABN) is a written notice from a healthcare provider to a Medicare beneficiary. It informs the beneficiary that Medicare might not cover a service or item they are about to receive. Therefore, they may be responsible for paying for it out of pocket. This notice allows patients to make informed decisions about their care and helps avoid unexpected costs.

In other words, it is a notice that a doctor or supplier should give a Medicare beneficiary when furnishing an item or service for which Medicare will likely deny payment. If you do not get an ABN before you get the service from your doctor or supplier, and Medicare does not pay for it, then you probably do not have to pay for it. If the doctor or supplier does give you an ABN that you sign before you get the service, and Medicare does not pay for it, then you will have to pay your doctor or supplier for it. ABNs only apply if you are in the Original Medicare Plan. However, they do not apply to members of a Medicare Managed Care Plan or Private Fee-for-Service Plan.

Legal and Ethical Considerations

The legal aspect can vary from state to state, and payor to payor (assuming in network, and have a contract which is a legal document.)
The ethical aspect to me is more of a “customer service” issue. If it is something that I would reasonably expect the provider’s office to know ahead of time, it is in EVERYONE’S best interest to have some type of ABN. The patient does not want to feel tricked or taken advantage of. Meanwhile, the provider’s office wants payment for services rendered. A signed document prior to services providing the cost does just that.

CHECK WITH YOUR PAYER!

Some commercial non-Medicare plans are starting to require healthcare providers to obtain ABNs when the insurance plan does not cover a procedure or service, and when the patient is responsible for out-of-pocket expenses.

You can modify the Medicare Part B ABN form and remove the word Medicare and replace it with the name of the medicare insurance carrier. Most vision care plans do not require the provider to obtain an ABN but always verify.

When is an ABN Required?

  1. Medicare Coverage Issues: A provider needs an ABN when the provider believes that Medicare may not cover a specific service or item. For example, the service may not meet medical necessity, may fall outside coverage, or may exceed coverage limits. When a Medicare item or service isn’t reasonable and necessary under Program standards, including care that’s:
    • Not indicated for the diagnosis, treatment of illness, injury, or to improve the functioning of a malformed body member
    • Experimental and investigational or considered research only
    • More than the number of services allowed in a specific period for that diagnosis
  2. Statutorily Excluded Items: Medicare statutorily excludes some items or services from coverage. In such cases, providers must issue an ABN to inform patients of their financial responsibilities.
  3. Non-Covered Services: Some services generally fall outside Medicare coverage, such as certain elective procedures or cosmetic services. When a provider offers these services, the provider should give an ABN.

Key ABN Guidelines

  1. Notification Timing: The provider must give the ABN before rendering the service. Ideally, the provider should give it as soon as the provider determines that Medicare may not cover the service.
  2. Content Requirements: The ABN must include specific information:
    • Description of the Service: Clearly describe the item or service that Medicare may not cover.
    • Reason for Non-Coverage: Explain why Medicare might not cover the service.
    • Estimated Cost: Provide an estimate of the cost that the patient might be responsible for if Medicare does not cover the service.
    • Patient Options: Outline the patient’s options, including whether to receive the service and be responsible for the payment or decline the service.
  3. Signature Requirement: The patient must sign the ABN. The signature acknowledges that the patient knows about the potential non-coverage and understands their financial responsibility. Also, record the signature date.
  4. Documentation: Providers should keep a copy of the signed ABN in the patient’s medical record. This documentation is crucial because it shows that the provider informed the patient. It also shows the patient agreed to the financial responsibility if Medicare denied the claim.
  5. Use of Correct Form: Providers must use the official ABN form provided by the Centers for Medicare & Medicaid Services (CMS). The form must be current and compliant with CMS regulations.

Required vs. Voluntary ABN

Medicare has defined the use of the ABN into two categories: required and voluntary.

Required 
The service or item is a benefit of Medicare (normally payable). However, because of restricted coverage, Medicare will not pay for it. For example:

Therapy services that have exceeded the cap amount 

Exceeded frequency limits 

Not reasonable or necessary (ex: diagnosis restriction) 

Skilled nursing services for a patient who is not homebound 

Voluntary 

The service or item is not a benefit of Medicare (never payable). In this circumstance, the ABN is a courtesy to the patient. As a result, the patient can make an informed decision before receiving the service. It also allows your office to provide documentation in case the patient questions the cost of the service at a later date. 

Impact on Medical Coding

Accurate medical coding relies heavily on the proper use of ABNs:

  • Claims Processing: Suppose the provider issues an ABN and bills the service correctly. Then Medicare may process the claim with the understanding that the provider notified the patient about potential non-coverage. This can help prevent claim denials related to coverage issues.
  • Patient Billing: Properly issued ABNs help ensure correct patient billing for non-covered services. As a result, they reduce the likelihood of disputes and billing complaints.

Common Pitfalls

  1. Failure to Issue: Not providing an ABN when required can lead to claim denials and financial liability for the provider. Therefore, issue an ABN whenever there is uncertainty about Medicare coverage.
  2. Incomplete ABNs: Incomplete or improperly filled-out ABNs can lead to compliance issues. So, complete all required fields and make sure the language is clear and accurate.
  3. Incorrect Form Usage: Always use the most recent version of the ABN form. Outdated forms may not meet current CMS requirements and can lead to compliance issues.

Advance Beneficiary Notices (ABNs) play a vital role in the healthcare billing process, providing transparency and protecting both patients and providers. Healthcare providers should adhere to ABN guidelines and ensure accurate documentation. That way, they can navigate Medicare coverage issues effectively and minimize the risk of claim denials. Staying informed about ABN requirements and maintaining proper procedures are key to efficient and compliant medical billing and coding practices.

CMS Advance Beneficiary Notice of Non-coverage Tutorial

In this tutorial, select any field (letters A–J) for details on how to complete each ABN section.

The term “notifiers” collectively refers to entities who issue ABNs. Notifiers can include physicians, practitioners, providers (including labs) and suppliers, and utilization review committees.

If you reproduce the ABN, remove the letters before issuing it to the patient.

CMS ABN form tutorial

Resources

Ready to become a certified medical coder? Our online CPC certification training prepares you for the AAPC CPC exam with a credentialed instructor. Many students train at little or no cost through medical coding scholarships and WIOA grants available in 30+ states.

Related Articles

Share This