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[Term] Advance Beneficiary Notice (ABN) [Definition] 
A notice that a doctor or supplier should give a Medicare beneficiary to sign when the doctor or supplier believes that Medicare will not pay for a particular service. By signing the notice, the beneficiary agrees to pay for the service. If the doctor or supplier does not provide the beneficiary with a notice, and Medicare does not pay for the service, then the beneficiary does not have to pay for the service. The advance beneficiary notice applies only to Medicare fee-for-service, not in managed care plans.
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