AG HCPCS Level II modifier: Primary physician
AG is a HCPCS Level II modifier: “Primary physician.” It adds this detail to the code it is reported with.
Official description
AGPrimary physician
HCPCS · United States
Medicare details
The indicators CMS publishes with AG in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 2005
Where AG sits
- 1GroupHCPCS modifiers
- 2Modifier AGPrimary physician
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code AG mean?
AG is the HCPCS code for “Primary physician” in CMS’s HCPCS Level II October 2026 release.
Where is AG in the HCPCS Level II list?
AG is listed under Modifiers.
Does Medicare cover AG?
CMS lists AG’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside AG
All modifiersAAAnesthesia services performed personally by anesthesiologistABAudiology service furnished personally by an audiologist without a physician/npp order for non-acute hearing assessment unrelated to disequilibrium, or hearing aids, or…ACInitial onboarding support payment for access beneficiary enrollment, device/app setup, and care coordination activities; first month only; once per beneficiary per trackADMedical supervision by a physician: more than four concurrent anesthesia proceduresAERegistered dieticianAFSpecialty physicianAHClinical psychologistAIPrincipal physician of recordAJClinical social workerAKNon participating physicianAMPhysician, team member serviceAOAlternate payment method declined by provider of service