What code is used for anesthesia services performed personally by an anesthesiologist?

The code used for anesthesia services performed personally by an anesthesiologist is indeed -AA. This modifier specifically indicates that the anesthesiologist was present and provided the anesthesia services personally. In the context of billing for anesthesia, modifiers are essential for clarifying the specific circumstances under which services were delivered, and -AA clearly identifies that the anesthesiologist directly administered the anesthesia without any intermediary. This helps ensure appropriate reimbursement and reflects the level of care provided to the patient during a surgical procedure.

In contrast, other modifiers like -QS denote medical supervision of anesthesia services, which indicates that the anesthesiologist was overseeing multiple procedures rather than personally administering the anesthesia. Similarly, -AD and -G8 serve different purposes within anesthesia coding, relating to medical direction and specific assessments based on a patient's condition during the anesthesia process, respectively. Thus, -AA is the correct choice as it specifically indicates personal delivery of anesthesia services by an anesthesiologist.