SG HCPCS Level II modifier: Ambulatory surgical center (asc) facility service
SG is a HCPCS Level II modifier: “Ambulatory surgical center (asc) facility service.” It adds this detail to the code it is reported with.
Official description
SGAmbulatory surgical center (asc) facility service
Short description: Asc facility service
HCPCS · United States
Medicare details
The indicators CMS publishes with SG in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 1992
Where SG sits
- 1GroupHCPCS modifiers
- 2Modifier SGAmbulatory surgical center (asc) facility service
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 SG mean?
SG is the HCPCS code for “Ambulatory surgical center (asc) facility service” in CMS’s HCPCS Level II October 2026 release.
Where is SG in the HCPCS Level II list?
SG is listed under Modifiers.
Does Medicare cover SG?
CMS lists SG’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 SG
All modifiersSANurse practitioner rendering service in collaboration with a physicianSBNurse midwifeSCMedically necessary service or supplySDServices provided by registered nurse with specialized, highly technical home infusion trainingSEState and/or federally-funded programs/servicesSFSecond opinion ordered by a professional review organization (pro) per section 9401, p.l. 99-272 (100% reimbursement - no medicare deductible or coinsurance)SHSecond concurrently administered infusion therapySJThird or more concurrently administered infusion therapySKMember of high risk population (use only with codes for immunization)SLState supplied vaccineSMSecond surgical opinionSNThird surgical opinion