The Advance Beneficiary Notice Asks You to Pick a Payer Before the Service
A Medicare notice can make you the one who pays if the item or service is denied, so read the option you check before anyone starts the work.
Some providers and suppliers hand you a form before they deliver an item or perform a service, and ask you to sign it. In Original Medicare that form is usually the Advance Beneficiary Notice of Noncoverage, called the ABN (Medicare.gov, Advance Beneficiary Notice). It is not a bill. It is a written warning that Medicare may decide not to pay for what is about to happen, and it asks you to choose how the claim should be handled.
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What the notice is for
The provider uses the ABN when they expect Medicare may deny payment because the item or service may not be reasonable and necessary for your situation (Medicare.gov). The form lists numbered options. One option asks that the claim go to Medicare and accepts that you pay if Medicare denies it. Another asks that Medicare not be billed at all, so you pay directly. A third is a choice to decline the item or service. Each option changes who carries the risk, so the box you check matters more than the signature.
What to check before you sign
Confirm that the item or service named on the notice matches what you were told. Ask whether a written cost estimate is attached, and whether it covers the whole order or only one part of it. Find the option you are checking and read what happens to the bill under that option. Ask whether the provider is enrolled to bill Medicare for this item. Keep a copy, and ask for a few minutes to read it without someone waiting on the signature.
If the explanation is only that the form is standard, keep asking. Ask the provider to explain the chosen option in plain words and to write that explanation on your copy. If the answer changes when you ask a second time, pause the order.
When the ABN does not fit
Some services are excluded from Medicare by law, and those follow different rules from a medical-necessity denial. Ask which notice applies and which Medicare rule the provider is relying on. Read Medicare's written rules for that rule rather than accepting a summary. For questions you cannot settle from the form, the Missouri Senior Health Insurance Program (Missouri SHIP) counselors can read the paperwork with you at no charge. Start with the Local Help With Paying for Care page for the contact route. Anything about whether a contract is enforceable goes to a lawyer, not this desk.