Anesthesiology CPT Modifier Diagnosis Unit of Service
A repeat anesthesia procedure on the same day which is billed with the CPT modifier 76 or 77 will be paid at $0.00.
AA Anesthesia services personally performed by an anesthesiologist. The AA modifier is used for all basic procedures
AD Medical supervision by a physician, more than four concurrent anesthesia procedures.
P1 Normal healthy patient.
P2 Patient with mild systemic disease
P3 Patient with severe systemic disease
P4 Patient with severe systemic disease that is a constant threat to life
P5 Moribund patient who is not expected to survive without the operation.
QS Monitored anesthesia care service (can be billed by CRNA or a physician). Modifier QS (Monitored Anesthesia Care) is for informational purposes. Please report actual monitoring time on the claim form. This modifier must be billed with another modifier to show that the service was personally performed or medically directed.
QX CRNA service, with medical direction by a physician.
QY Medical direction of one 1 CRNA by an anesthesiologist.
QZ CRNA service, without medical direction by a physician.
Based on dates of service, the ICD-9 code V25.2 or the ICD-10 code Z30.2 must be used for sterilizations.s.
Enter total units (1 unit = 1 minute) for time