Answer: MODIFIERS-23
In this case Modifiers-23 is used. CPT (Current Procedural Terminology) Modifiers are coding systems that provide additional information regarding a medical procedure. These modifiers are either numeric or alphanumeric.
Modifier 23 code is used for unusual anesthesia. CPT modifiers are used in hospitals by surgeons to describe the procedure used in a treatment, necessity of the procedure, etc.