Modifier GP
Services delivered under an outpatient physical therapy plan of care
✅ When to Use Modifier GP
Services delivered under an outpatient physical therapy plan of care
⛔ When NOT to Use Modifier GP
Do not use for OT (use GO) or speech (use GN)
Modifier GP FAQ
What does modifier GP mean? +
Services delivered under an outpatient physical therapy plan of care
When should I use modifier GP? +
Services delivered under an outpatient physical therapy plan of care
When should I NOT use modifier GP? +
Do not use for OT (use GO) or speech (use GN)
What documentation is required for modifier GP? +
Complete chart documentation supporting the modifier's clinical or billing rationale.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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