GP HCPCS Level II modifier: Services delivered under an outpatient physical therapy plan of care

GP is a HCPCS Level II modifier: “Services delivered under an outpatient physical therapy plan of care.” It adds this detail to the code it is reported with.

Official description

GP

Services delivered under an outpatient physical therapy plan of care

Short description: Op pt services

HCPCS · United States

Medicare details

The indicators CMS publishes with GP in its October 2026 file. They describe Medicare’s handling, not another payer’s.

Medicare coverage: Carrier judgment
Added: Jan 1, 1999

Where GP sits

1GroupHCPCS modifiers
2Modifier GPServices delivered under an outpatient physical therapy plan of care

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.

See GP in the CMS source

Frequently asked questions

What does HCPCS code GP mean?

GP is the HCPCS code for “Services delivered under an outpatient physical therapy plan of care” in CMS’s HCPCS Level II October 2026 release.

Where is GP in the HCPCS Level II list?

GP is listed under Modifiers.

Does Medicare cover GP?

CMS lists GP’s Medicare coverage as “Carrier judgment”. 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.

All modifiers

GJ"opt out" physician or practitioner emergency or urgent service GKReasonable and necessary item/service associated with a ga or gz modifier GLMedically unnecessary upgrade provided instead of non-upgraded item, no charge, no advance beneficiary notice (abn)GMMultiple patients on one ambulance trip GNServices delivered under an outpatient speech language pathology plan of care GOServices delivered under an outpatient occupational therapy plan of care GQVia asynchronous telecommunications system GRThis service was performed in whole or in part by a resident in a department of veterans affairs medical center or clinic, supervised in accordance with va policy GSDosage of erythropoietin stimulating agent has been reduced and maintained in response to hematocrit or hemoglobin level GTVia interactive audio and video telecommunication systems GUWaiver of liability statement issued as required by payer policy, routine notice GVAttending physician not employed or paid under arrangement by the patient's hospice provider