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G9 HCPCS Level II modifier: Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition

G9 is a HCPCS Level II modifier: “Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition.” It adds this detail to the code it is reported with.

Official description

G9

Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition

Short description: Mac for at risk patient

HCPCS · United States

Medicare details

The indicators CMS publishes with G9 in its October 2026 file. They describe Medicare’s handling, not another payer’s.

Medicare coverage
Carrier judgment
Added
Jul 1, 1999

Where G9 sits

  1. 1GroupHCPCS modifiers
  2. 2Modifier G9Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition

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 G9 in the CMS source

Frequently asked questions

What does HCPCS code G9 mean?

G9 is the HCPCS code for “Monitored anesthesia care for patient who has history of severe cardio-pulmonary condition” in CMS’s HCPCS Level II October 2026 release.

Where is G9 in the HCPCS Level II list?

G9 is listed under Modifiers.

Does Medicare cover G9?

CMS lists G9’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.

Codes beside G9

G3Most recent urr reading of 65 to 69.9G4Most recent urr reading of 70 to 74.9G5Most recent urr reading of 75 or greaterG6Esrd patient for whom less than six dialysis sessions have been provided in a monthG7Pregnancy resulted from rape or incest or pregnancy certified by physician as life threateningG8Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedureGAWaiver of liability statement issued as required by payer policy, individual caseGBClaim being re-submitted for payment because it is no longer covered under a global payment demonstrationGCThis service has been performed in part by a resident under the direction of a teaching physicianGDUnits of service exceeds medically unlikely edit value and represents reasonable and necessary servicesGEThis service has been performed by a resident without the presence of a teaching physician under the primary care exceptionGFNon-physician (e.g. nurse practitioner (np), certified registered nurse anesthetist (crna), certified registered nurse (crn), clinical nurse specialist (cns), physician assistant…