One of the following modifiers must be reported with anesthesia services to indicate who performed the anesthesia service:
AA Anesthesia services performed personally by anesthesiologist
AD Medical supervision by a physician: more than four concurrent anesthesia procedures
QK Medically directed by a physician: two, three, or four concurrent procedures
QY Anesthesiologist medically directs one CRNA
QX CRNA service: with medical direction by a physician
QZ CRNA service: without medical direction by a physician
The following modifiers can be reported in the 2nd position under appropriate circumstances in addition to one of the previous anesthesia modifiers:
QS Monitored anesthesia care service
23 Unusual anesthesia
Note: When using modifier 23, appropriate documentation must be submitted with the claim.
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