When a Medicare Advance Beneficiary Notice (ABN) has been obtained, what modifier code should be appended to the service to indicate the appropriate form has been received and was signed by the patient in accordance with Medicare guidelines?

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Modifier GA is used to indicate that a Medicare Advance Beneficiary Notice (ABN) has been issued and signed by the patient, acknowledging that they may be responsible for payment if Medicare denies the claim.

When a Medicare Advance Beneficiary Notice (ABN) Has Been Obtained