AD HCPCS Level II modifier: Medical supervision by a physician: more than four concurrent anesthesia procedures
AD is a HCPCS Level II modifier: “Medical supervision by a physician: more than four concurrent anesthesia procedures.” It adds this detail to the code it is reported with.
Official description
ADMedical supervision by a physician: more than four concurrent anesthesia procedures
Short description: Md supervision, >4 anes proc
HCPCS · United States
Medicare details
The indicators CMS publishes with AD in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Special coverage instructions apply
- Added
- Jan 1, 1984
Where AD sits
- 1GroupHCPCS modifiers
- 2Modifier ADMedical supervision by a physician: more than four concurrent anesthesia procedures
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 AD mean?
AD is the HCPCS code for “Medical supervision by a physician: more than four concurrent anesthesia procedures” in CMS’s HCPCS Level II October 2026 release.
Where is AD in the HCPCS Level II list?
AD is listed under Modifiers.
Does Medicare cover AD?
CMS lists AD’s Medicare coverage as “Special coverage instructions apply”. 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 AD
All modifiersA7Dressing for seven woundsA8Dressing for eight woundsA9Dressing for nine or more woundsAAAnesthesia services performed personally by anesthesiologistABAudiology service furnished personally by an audiologist without a physician/npp order for non-acute hearing assessment unrelated to disequilibrium, or hearing aids, or…ACInitial onboarding support payment for access beneficiary enrollment, device/app setup, and care coordination activities; first month only; once per beneficiary per trackAERegistered dieticianAFSpecialty physicianAGPrimary physicianAHClinical psychologistAIPrincipal physician of recordAJClinical social worker