HCPCS modifier codes starting with A

33 codes. Every code ever valid for billing is listed, including those now retired.

Code	Description	Status
A1	Dressing for one wound	Valid
A2	Dressing for two wounds	Valid
A3	Dressing for three wounds	Valid
A4	Dressing for four wounds	Valid
A5	Dressing for five wounds	Valid
A6	Dressing for six wounds	Valid
A7	Dressing for seven wounds	Valid
A8	Dressing for eight wounds	Valid
A9	Dressing for nine or more wounds	Valid
AA	Anesthesia services performed personally by anesthesiologist	Valid
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	Valid
AC	Initial onboarding support payment for access beneficiary enrollment, device/app setup, and care coordination activities; first month only; once per beneficiary per track	Valid
AD	Medical supervision by a physician: more than four concurrent anesthesia procedures	Valid
AE	Registered dietician	Valid
AF	Specialty physician	Valid
AG	Primary physician	Valid
AH	Clinical psychologist	Valid
AI	Principal physician of record	Valid
AJ	Clinical social worker	Valid
AK	Non participating physician	Valid
AM	Physician, team member service	Valid
AO	Alternate payment method declined by provider of service	Valid
AP	Determination of refractive state was not performed in the course of diagnostic ophthalmological examination	Valid
AQ	Physician providing a service in an unlisted health professional shortage area (hpsa)	Valid
AR	Physician provider services in a physician scarcity area	Valid
AS	Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery	Valid
AT	Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)	Valid
AU	Item furnished in conjunction with a urological, ostomy, or tracheostomy supply	Valid
AV	Item furnished in conjunction with a prosthetic device, prosthetic or orthotic	Valid
AW	Item furnished in conjunction with a surgical dressing	Valid
AX	Item furnished in conjunction with dialysis services	Valid
AY	Item or service furnished to an esrd patient that is not for the treatment of esrd	Valid
AZ	Physician providing a service in a dental health professional shortage area for the purpose of an electronic health record incentive payment	Valid