Modifier Description Level II
A1Dressing for one wound
A2Dressing for two wounds
A3Dressing for three wounds
A4Dressing for four wounds
A5Dressing for five wounds
A6Dressing for six wounds
A7Dressing for seven wounds
A8Dressing for eight wounds
A9Dressing for nine or more wounds
AAAnesthesia services performed personally by anesthesiologist
ADMedical supervision by a physician: more than four concurrent anesthesia procedures
AERegistered dietician
AFSpecialty physician
AGPrimary physician
AHClinical psychologist
AIPrincipal physician of record
AJClinical social worker
AKNon participating physician
AMPhysician, team member service
AOAlternate payment method declined by provider of service
APDetermination of refractive state was not performed in the course of diagnostic ophthalmological examination
AQPhysician providing a service in an unlisted health professional shortage area (hpsa)
ARPhysician provider services in a physician scarcity area
ASPhysician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
ATAcute treatment (this modifier should be used when reporting service 98940, 98941, 98942)