Modifier GR- VA Resident Service

Modifier GR identifies services performed in whole or in part by a physician resident at a VA medical center or clinic under VA supervision requirements.

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What is Modifier GR?

Modifier GR identifies a service performed in whole or in part by a physician resident at a Department of Veterans Affairs medical center or clinic while supervised according to VA policy.

CMS established GR at the request of the Department of Veterans Affairs specifically for resident-provided care in VA facilities. The modifier differs from GC and GE, which are associated with Medicare teaching-physician rules in settings subject to CMS Physicians at Teaching Hospitals requirements.

GR is therefore best understood as a VA-specific HCPCS modifier, not a general Medicare resident modifier.

The modifier remains listed in current HCPCS modifier references with its VA resident-service descriptor.

When to Use Modifier GR

VA Medical Center or Clinic: The service is furnished in an applicable Department of Veterans Affairs medical facility.

Resident Participates: A physician resident performs all or part of the reported service.

VA Supervision Requirements Are Met: The resident is supervised in accordance with applicable VA policy.

Eligible Professional Service: The underlying CPT or HCPCS code accurately represents the service furnished.

Documentation Supports Resident Care: The record identifies the resident's participation and the applicable supervising practitioner.

When NOT to Use Modifier GR

Non-VA Facility: Do not use GR simply because a resident participates in care at another hospital or clinic.

No Resident Participation: The modifier is not appropriate when the service is furnished entirely by the supervising practitioner.

CMS Teaching Physician Rules Apply Instead: In applicable non-VA teaching settings, GC or GE may better describe the resident-service circumstances.

Unsupported Supervision: GR should not be reported when documentation fails to support the required supervision.

Incorrect Provider Type: Historical VA guidance specifically excluded certain specialties such as dentistry, optometry, and podiatry from GR under that policy framework.

Billing Example

A patient receives a professional service at a VA medical center.

A physician resident performs part of the evaluation and treatment while working under the supervision of an authorized VA supervising practitioner.

The service is documented according to applicable VA supervision requirements.

The appropriate CPT or HCPCS code is reported with Modifier GR to identify that the service was furnished in whole or in part by a resident in a VA facility under VA supervision.

Documentation Requirements

Resident Participation: Clearly document the portion of the service performed by the physician resident.

Supervising Practitioner: Identify the practitioner responsible for supervising the resident.

VA Supervision Compliance: Documentation should demonstrate that supervision satisfied applicable VA policy.

Service Performed: The medical record should support the CPT or HCPCS code reported.

Medical Necessity: Document why the underlying professional service was clinically appropriate.

Provider Identification: The record should accurately identify the resident and supervising practitioner involved in the encounter.

Claim Consistency: Procedure codes, Modifier GR, provider information, and documentation should consistently represent the manner in which the service was furnished.

Billing and Claim Considerations

Modifier GR was created because VA medical facilities operate under a different resident-billing framework from facilities subject to ordinary CMS teaching-physician payment rules.

VA policy explains that GC and GE are more specifically associated with CMS teaching-hospital requirements, while GR was established for physician resident care furnished in VA medical centers and clinics.

The modifier does not eliminate supervision requirements. VA guidance requires resident-delivered care to remain under appropriate supervision and responsibility of a licensed independent practitioner.

GR should therefore not be treated as a general teaching-hospital modifier. Its defining characteristic is resident participation within an applicable VA facility under VA supervision policy.

Because the VA directive that historically governed this billing framework reached its listed expiration date in January 2026, organizations should verify current VA billing instructions when applying GR to current claims, even though the modifier itself continues to appear in current HCPCS modifier listings.

Common Billing Mistakes

Using GR Outside a VA Facility: GR specifically identifies resident services in applicable VA medical centers or clinics.

Confusing GR With GC: GC represents a resident service under a teaching physician in applicable CMS teaching settings.

Confusing GR With GE: GE applies to qualifying resident services under Medicare's primary care exception.

Missing Resident Documentation: The record does not clearly establish the physician resident's participation.

Unsupported Supervision: Documentation fails to demonstrate applicable supervising-practitioner involvement.

Using Outdated VA Instructions: Providers should confirm current VA policy rather than relying solely on older supervision guidance.

Common Denial Reasons

VA Setting Is Unsupported: Claim information does not demonstrate that the service occurred in an applicable VA medical center or clinic.

Resident Participation Is Missing: Documentation does not establish that a physician resident performed all or part of the service.

Supervision Is Unsupported: The medical record does not demonstrate compliance with applicable VA supervision requirements.

Incorrect Modifier: The circumstances are more accurately described by GC, GE, or another modifier.

Underlying Service Is Unsupported: Documentation does not substantiate the CPT or HCPCS code reported.

Provider Information Is Inconsistent: Claim and medical record information do not consistently identify the resident or supervising practitioner.

Modifier GR vs. GC and GE

Modifier GR: Resident service furnished in whole or in part at a VA medical center or clinic under VA supervision policy.

Modifier GC: Service performed in part by a resident under the direction of a teaching physician.

Modifier GE: Qualifying resident service furnished without the presence of a teaching physician under Medicare's primary care exception.

The key distinction is that GR is specific to applicable VA resident billing, while GC and GE are associated with Medicare teaching-physician billing circumstances.

Frequently Asked Questions

Is Modifier GR a Medicare teaching physician modifier?
Not in the same way as GC or GE. GR was established specifically for physician resident services furnished in VA medical centers or clinics under VA supervision requirements.

Can Modifier GR be used outside the Department of Veterans Affairs?
No. Its descriptor specifically identifies services furnished by residents in VA medical centers or clinics under VA policy.