Required Modifiers
Required Modifiers for Anesthesiologist Description Reimbursement
AA Anesthesia services personally performed by anesthesiologist
100 percent of allowable amount
AD Medical supervision by a physician, more than four concurrent anesthesia
procedures
Max 3 base units + time units) effective 10/1/2014 date of service
QK Medical direction of two, three or four concurrent anesthesia procedures
50 percent of allowable amount effective 10/1/2014 date of service
QY Medical direction of one C.R.N.A by anesthesiologist
50 percent of allowable amount effective 10/1/2014 date of service
Required Modifiers For CRNAs
QX Qualified non-physician anesthetist with medical direction by physician.
80 percent of the payment made for the QK or QY claim effective 10/1/2014 date of service
QZ CRNA service, without medical direction by anesthesiologist
80 percent of allowable amount effective 10/1/2014 date of service
