Anesthesia services personally performed by an anesthesiologist. The -AA modifier is used for all basic procedures.
Normal healthy patient.
Patient with mild systemic disease.
Patient with severe systemic disease.
Patient with severe systemic disease that is a constant threat to life.
Moribund patient who is not expected to survive without the operation.
Monitored anesthesia care service (can be billed by CRNA or a physician). This modifier for monitored anesthesia care (QS) 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.
CRNA service; with medical direction by a physician.
CRNA service; without medical direction by a physician.