HCPCS Modifier GH
HCPCS modifier GH is used to report a diagnostic mammogram converted from screening mammogram on the same day.
Guidelines and Instructions
This modifier may be submitted with CPT codes: 77065 and 77066, and HCPCS codes G0204 and G0206. HCPCS codes G0204 and G0206 are no longer valid for dates of service January 1, 2018 and after.