Anesthesia Modifier Payment Table

Anesthesia modifiers as defined by Medicare, are reimbursed according to the following Modifier Payment Table.

Modifier Description Reimbursement % of Maximum
Allowable Fee Schedule
AA Anesthesia services personally performed by an anesthesiologist 100%
AD Medical Supervision by a physician; more than four concurrent anesthesia procedures 100%
QK Medical direction of two, three, or four concurrent anesthesia procedures involving qualified individuals 50%
QS Monitored anesthesia care provided by an anesthesiologist 100%
QX CRNA Service with medical direction by a physician 50%
QY Medical direction of one CRNA by an anesthesiologist 50%
QZ CRNA service without medical direction by a physician 100%
Please note this information may change periodically.