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A notice that is given by a doctor, supplier, or provider before providing a service or product for which Medicare may deny payment. If you are not given an ABN before you receive a service or product and Medicare denies payment, you may not have to pay for it. If you are given an ABN and you sign the notice, you will likely have to pay for the item or service if Medicare does deny payment. An ABN is only applicable if you are enrolled in Original Medicare, Part A and Part B.