Anesthesia Modifier List
AA – Anesthesia services personally performed by anesthesiologist
AD – Medical supervision by a physician: More than 4 concurrent anesthesia procedures
AE – Direction of residents in furnishing not more than two concurrent anesthesia services – attending physician relationship met
QK – Medical direction of 2, 3, or 4 concurrent anesthesia procedures involving qualified individuals
QS – Monitored anesthesia care
QX – CRNA service with medical direction by physician
QY – Medical direction of one concurrent anesthesia procedure involving qualified individuals
QZ – CRNA service without medical direction 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
47 – Anesthesia by surgeon – Used to report regional or general anesthesia provided by the surgeon (not for local anesthesia)
