GX HCPCS Level II modifier: Notice of liability issued, voluntary under payer policy

GX is a HCPCS Level II modifier: “Notice of liability issued, voluntary under payer policy.” It adds this detail to the code it is reported with.

Official description

GX

Notice of liability issued, voluntary under payer policy

Short description: Voluntary liability notice

HCPCS · United States

Medicare details

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

Medicare coverage: Carrier judgment
Added: Apr 1, 2010

Where GX sits

1GroupHCPCS modifiers
2Modifier GXNotice of liability issued, voluntary under payer policy

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 GX in the CMS source

Frequently asked questions

What does HCPCS code GX mean?

GX is the HCPCS code for “Notice of liability issued, voluntary under payer policy” in CMS’s HCPCS Level II October 2026 release.

Where is GX in the HCPCS Level II list?

GX is listed under Modifiers.

Does Medicare cover GX?

CMS lists GX’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

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 GWService not related to the hospice patient's terminal condition GYItem or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit GZItem or service expected to be denied as not reasonable and necessary H9Court-ordered HAChild/adolescent program HBAdult program, non geriatric HCAdult program, geriatric