The ABN medical abbreviation most often stands for Advance Beneficiary Notice of Noncoverage, a written notice that a clinic, lab or supplier gives a person with original Medicare before a service that Medicare may not pay for. In clinical notes and lab reports, lower case abn is also a common shortcut for abnormal.
Patients usually meet the notice at a front desk or lab check in, and medical assistants, billers and coding students learn it as part of front office work. This page explains what the notice does, when it is given, and how to tell it apart from the abnormal meaning.
At a glance
Stands for
Advance Beneficiary Notice of NoncoverageOther meanings
Abnormal, as in abn lab or abn findingsUsed in
Original Medicare billing, clinics, labs, equipment suppliersWhere you see it
Front desk, lab check in, billing recordsWho signs
The patient or their representative, before the serviceRelated terms
What the ABN medical abbreviation means at the front desk
An Advance Beneficiary Notice tells a person with original Medicare, before they receive an item or service, that the provider believes Medicare may not cover it in this case. Common reasons include a test done more often than coverage rules allow, or a service Medicare does not consider medically necessary for the stated diagnosis.
The notice gives the patient a chance to decide, with the facts in front of them, whether to go ahead. It names the service, explains why coverage may be denied, and gives space to choose an option and sign. A staff member should be able to answer questions about it before the patient signs.
The choices on the notice
The form usually lists options for the patient to pick from. In broad terms they are:
| Choice | What it means in general |
|---|---|
| Receive the service and have it billed to Medicare | Medicare reviews the claim; if it is denied, the patient may be responsible and can appeal |
| Receive the service without billing Medicare | The patient pays directly and no claim is sent, so no appeal is possible |
| Decline the service | The service is not done and nothing is billed for it |
The exact wording on the form, and the rules behind it, are set by Medicare. A billing office can explain how the choice applies to a given visit.
A realistic ABN moment
At a lab check in: "Medicare may not pay for one of the tests on this order for the reason listed, so please review this ABN before we draw your blood." The staff member is giving notice that this test may not be paid by Medicare, so the patient can choose how to proceed.
In the chart, staff may then write a line such as "ABN signed, option 1 selected," so the billing team knows the notice was given and which choice was made.
ABN meaning abnormal in notes and results
In clinical writing, abn is a plain short form of abnormal. It shows up in lines like "abn LFTs," meaning abnormal liver function tests, or "abn gait," meaning an unusual way of walking. On some lab printouts a result may also be flagged H or L for high or low, which is a related idea.
The contrast with the Medicare notice is clear in context. Abnormal sits next to a test, finding or body part. The notice sits next to words like signed, given, Medicare, coverage or billing. The LFT and WNL pages show more result shorthand.
ABN abbreviation medical students should know
Medical assistant and billing students learn a few practical points about the notice: it must be given before the service, not after; it should name the specific item and give a real reason; and a blanket notice signed for every visit is not how it is meant to be used. Coders may also see a related claim modifier showing a notice is on file.
The chart notes and nursing section covers more of the shorthand that appears in front office and clinical records.
Coverage rules are specific to each plan and situation. The provider's billing office or Medicare itself can explain how a particular notice affects you.
Frequently asked questions
What does ABN mean in medical billing?
It means Advance Beneficiary Notice of Noncoverage. It is a notice given to people with original Medicare before a service that Medicare may not pay for.
Do I have to sign an ABN?
The notice asks you to choose an option and sign before the service. If you have questions or concerns, ask the staff to explain it, or contact the billing office before deciding.
What does abn mean on lab results?
In results and notes, abn is short for abnormal. It means a value or finding fell outside what is expected; whoever ordered the test can say what it means in your case.
Is an ABN the same as an EOB?
No. An ABN is given before a service to warn that coverage may be denied. An explanation of benefits comes from a plan after a claim to show how it was processed.