AA HCPCS Level II modifier: Anesthesia services performed personally by anesthesiologist
AA is a HCPCS Level II modifier: “Anesthesia services performed personally by anesthesiologist.” It adds this detail to the code it is reported with.
Official description
AAAnesthesia services performed personally by anesthesiologist
Short description: Anesthesia perf by anesgst
HCPCS · United States
Medicare details
The indicators CMS publishes with AA 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 AA sits
- 1GroupHCPCS modifiers
- 2Modifier AAAnesthesia services performed personally by anesthesiologist
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 AA mean?
AA is the HCPCS code for “Anesthesia services performed personally by anesthesiologist” in CMS’s HCPCS Level II October 2026 release.
Where is AA in the HCPCS Level II list?
AA is listed under Modifiers.
Does Medicare cover AA?
CMS lists AA’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 AA
All modifiersA4Dressing for four woundsA5Dressing for five woundsA6Dressing for six woundsA7Dressing for seven woundsA8Dressing for eight woundsA9Dressing for nine or more woundsABAudiology 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 trackADMedical supervision by a physician: more than four concurrent anesthesia proceduresAERegistered dieticianAFSpecialty physicianAGPrimary physician