The Advanced Beneficiary Notice of Noncoverage (ABN) is one of the most critical Medicare forms that you can utilize. It is for use with covered services/supplies that might not be covered by Medicare in a specific situation. The ABN is proof that you have told the patient about these services/supplies. As an informed consumer they can then decide whether or not to receive your services as an out-of-pocket expense, or through other insurance if they have it.
If you use it properly, you will be able to collect your fees from the patient should the care that you provided be considered medically unnecessary. If Medicare determines that the care you provided is medically unnecessary and you do not have and ABN on file for that patient, you will have to refund the money that Medicare paid and you will not be able to collect from the patient.