G8 HCPCS Level II modifier: Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure
G8 is a HCPCS Level II modifier: “Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure.” It adds this detail to the code it is reported with.
Official description
G8Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure
Short description: Monitored anesthesia care
HCPCS · United States
Notes for G8
As CMS prints them, with any note G8 takes from the headings above it.
Note
- CMS processing note 0083: MODIFIER G8 FOR USE WITH THE FOLLOWING SIX ANESTHESIA CODES; 00100, 00300, 00400, 00160, 00532 AND 00920.
Medicare details
The indicators CMS publishes with G8 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jul 1, 1999
Where G8 sits
- 1GroupHCPCS modifiers
- 2Modifier G8Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure
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.
Frequently asked questions
What does HCPCS code G8 mean?
G8 is the HCPCS code for “Monitored anesthesia care (mac) for deep complex, complicated, or markedly invasive surgical procedure” in CMS’s HCPCS Level II October 2026 release.
Where is G8 in the HCPCS Level II list?
G8 is listed under Modifiers.
Does Medicare cover G8?
CMS lists G8’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 G8
All modifiersG2Most recent urr reading of 60 to 64.9G3Most 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 threateningG9Monitored anesthesia care for patient who has history of severe cardio-pulmonary conditionGAWaiver 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 exception