Anesthesia Code Modifiers

AA - Anesthesia services personally performed by anesthesiologist - Distinct fee schedule amount. Affects payment.


AD - Medical supervision by a physician: More than 4 concurrent anesthesia procedures -. Distinct fee schedule amount. Affects payment.

G8 - Monitored anesthesia care (MAC) for deep complex, complicated, or markedly invasive surgical procedure.

G9 - Monitored anesthesia care (MAC) for deep complex, complicated, or markedly invasive surgical procedure.

QK - Medical direction of 2, 3 or 4 concurrent anesthesia procedures involving qualified individuals - 1999 services limits the payment to 50% of the amount that would have been allowed if personally performed by a physician or non-supervised CRNA.

QS - Monitored anesthesia care - No effect on payment. For informational purposes only. Must be used in conjunction with a pricing anesthesia modifier.

QX - CRNA service with medical direction by physician - 1999 services limits the payment to 50% of the amount that would have been allowed if personally performed by physician or non-supervised CRNA.

QY - Medical direction of one certified registered nurse anesthetist (CRNA) by an anesthesiologist.

QZ - CRNA service without medical direction by a physician - No effect on payment. Payment is equal to the amount that would have been allowed if personally performed by a physician.

23 - Unusual anesthesia - Used to report a procedure which usually requires either no anesthesia or local anesthesia; however, because of unusual circumstances must be done under general anesthesia.Coverage /payment will be determined on a "by-report" basis.

47 - Anesthesia by surgeon - Used to report regional or general anesthesia provided by the surgeon (Not covered by Medicare).