The modifier GA is appended to procedure codes for noncovered Medicare services when

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The modifier GA is used to indicate that a service is expected to be denied as not reasonable and necessary by Medicare, and that a signed Advance Beneficiary Notice (ABN) is on file. This modifier is used to inform Medicare that the provider has informed the patient that the service is likely not covered and that the patient has agreed to pay out-of-pocket if Medicare denies payment.

The Modifier GA Is Appended to Procedure Codes for Noncovered