HCPCS Modifier G9
Monitored anesthesia (MAC) for patient who has a history of severe cardio-pulmonary condition.
Guidelines and Instructions
- Submit this modifier only with anesthesia services (i.e., CPT codes 00100 through 01999)
- Submit the modifier indicating personally performed, medically directed or medically supervised in the first modifier position and HCPCS modifier G9 in the second