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). |
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