HCPCS ‘A’ Modifiers

ModifierDescription

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
ABAudiology 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

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)

AUItem furnished in conjunction with a urological, ostomy, or tracheostomy supply
AVItem furnished in conjunction with a prosthetic device, prosthetic or orthotic
AWItem furnished in conjunction with a surgical dressing

AXItem furnished in conjunction with dialysis services
AYItem or service furnished to an esrd patient that is not for the treatment of esrd
AZPhysician providing a service in a dental health professional shortage area for the purpose of an electronic health record incentive payment

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