HCPCS 'A' Modifiers (32)

Modifier Description
A1 Dressing for one wound
A2 Dressing for two wounds
A3 Dressing for three wounds
A4 Dressing for four wounds
A5 Dressing for five wounds
A6 Dressing for six wounds
A7 Dressing for seven wounds
A8 Dressing for eight wounds
A9 Dressing for nine or more wounds
AA Anesthesia services performed personally by anesthesiologist
AB Audiology service furnished personally by an audiologist without a physician/npp order for non-acute hearing assessment unrelated to disequilibrium, or hearing aids, or examinations for the purpose of prescribing, fitting, or changing hearing aids; service may be performed once every 12 months, per beneficiary
AD Medical supervision by a physician: more than four concurrent anesthesia procedures
AE Registered dietician
AF Specialty physician
AG Primary physician
AH Clinical psychologist
AI Principal physician of record
AJ Clinical social worker
AK Non participating physician
AM Physician, team member service
AO Alternate payment method declined by provider of service
AP Determination of refractive state was not performed in the course of diagnostic ophthalmological examination
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
AR Physician provider services in a physician scarcity area
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
AT Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)
AU Item furnished in conjunction with a urological, ostomy, or tracheostomy supply
AV Item furnished in conjunction with a prosthetic device, prosthetic or orthotic
AW Item furnished in conjunction with a surgical dressing
AX Item furnished in conjunction with dialysis services
AY Item or service furnished to an esrd patient that is not for the treatment of esrd
AZ Physician providing a service in a dental health professional shortage area for the purpose of an electronic health record incentive payment