Which statement about the GP modifier is correct?

• A. It indicates a service performed by a nurse.
• B. It indicates telehealth.
• C. It indicates therapy is provided by a physical therapist.
• D. It indicates a surgical procedure.

Answer: (C)

The main idea being tested is how billing modifiers identify who is delivering therapy services. The GP modifier is used with therapy codes to indicate that the service is part of a physical therapy plan of care and is provided by a physical therapist (or under a PT’s supervision). This helps the payer recognize the practitioner type and the therapy context for reimbursement. It is not used to signify a nurse, telehealth, or a surgical procedure. Telehealth has its own indicators, and a surgical procedure uses different surgical modifiers, so GP specifically points to therapy delivered by a physical therapist.