GC HCPCS Level II modifier: This service has been performed in part by a resident under the direction of a teaching physician
GC is a HCPCS Level II modifier: “This service has been performed in part by a resident under the direction of a teaching physician.” It adds this detail to the code it is reported with.
Official description
GCThis service has been performed in part by a resident under the direction of a teaching physician
Short description: Resident/teaching phys serv
HCPCS · United States
Medicare details
The indicators CMS publishes with GC in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Special coverage instructions apply
- Added
- Jan 1, 1997
Where GC sits
- 1GroupHCPCS modifiers
- 2Modifier GCThis service has been performed in part by a resident under the direction of a teaching 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 GC mean?
GC is the HCPCS code for “This service has been performed in part by a resident under the direction of a teaching physician” in CMS’s HCPCS Level II October 2026 release.
Where is GC in the HCPCS Level II list?
GC is listed under Modifiers.
Does Medicare cover GC?
CMS lists GC’s Medicare coverage as “Special coverage instructions apply”. 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 GC
All modifiersG6Esrd patient for whom less than six dialysis sessions have been provided in a monthG7Pregnancy resulted from rape or incest or pregnancy certified by physician as life threateningG8Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedureG9Monitored anesthesia care for patient who has history of severe cardio-pulmonary conditionGAWaiver of liability statement issued as required by payer policy, individual caseGBClaim being re-submitted for payment because it is no longer covered under a global payment demonstrationGDUnits of service exceeds medically unlikely edit value and represents reasonable and necessary servicesGEThis service has been performed by a resident without the presence of a teaching physician under the primary care exceptionGFNon-physician (e.g. nurse practitioner (np), certified registered nurse anesthetist (crna), certified registered nurse (crn), clinical nurse specialist (cns), physician assistant…GGPerformance and payment of a screening mammogram and diagnostic mammogram on the same patient, same dayGHDiagnostic mammogram converted from screening mammogram on same dayGJ"opt out" physician or practitioner emergency or urgent service