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Modifier GC Fact Sheet


  • Service has been performed in part by a Resident under the direction of a teaching physician.

Appropriate Usage:

  • When the Resident performs a service in a teaching facility under the supervision of a teaching physician.

Inappropriate Usage:

  • When the teaching physician is not involved in any portion of the service

CMS Reference:
CMS Internet Only Manual 100-04 Chapter 12 Section 100 for teaching physician information