An Advance Beneficiary Notice (ABN), also known as a waiver of liability, is a notice health care providers and suppliers are required to give a person with Original Medicare when they believe that Medicare will not cover their services or items and the person has no reason to know that Medicare will not cover these services or items. If your provider does not give you an ABN to sign and you have no reason to know the procedure is not covered, then you do not have to pay. If you sign an ABN before you get the service or item and Medicare does not pay for it, you generally pay for it (although there are a few exceptions). Providers are not required to give you an ABN for services or items Medicare never covers.