All ASC CPT codes
Anesthesiology in the ASC · Anesthesia 00100–01999; 99100–99140

Anesthesiology CPT Codes for Ambulatory Surgery Centers

Anesthesiology is the peri-operative backbone of an ASC, covering pre-operative evaluation, intra-operative management, and recovery for nearly every case on the schedule. The billed code follows the surgical procedure being supported rather than describing a standalone surgery.

Anesthesia uses its own CPT family, 00100 through 01999, where each code maps to a body region or type of operation. For example, 01402 covers anesthesia for knee arthroplasty and 00176 covers anesthesia for pharyngeal surgery. Payment is built on base units, time, and modifiers, so its documentation differs from surgical CPT logic. When the underlying surgery is on CMS Addendum AA, the ASC Covered Procedures List, Medicare pays it in the ASC and the supporting anesthesia is part of that episode. DataLily's procedure library tracks CPT-specific prior-authorization and documentation requirements so the anesthesia and surgical sides stay aligned.

Anesthesiology codes(58)

Is anesthesia used for procedures done in an ambulatory surgery center?

Yes. Most ASC cases involve an anesthesia care team that manages pre-operative evaluation, intra-operative anesthesia, and recovery. The service is reported on place of service 24, and the specific anesthesia code follows the surgical procedure it supports, such as 01402 for a knee arthroplasty case.

What CPT codes does anesthesiology use?

Anesthesia services use the CPT range 00100-01999, where each code corresponds to a body region or type of operation. Add-on codes in the 99100-99140 range capture qualifying circumstances and physical status. Our dataset maps 58 ASC-relevant anesthesia codes for this specialty.

Does Medicare pay for anesthesia in the ASC setting?

Payment depends on the underlying surgery. When the surgical procedure is on CMS Addendum AA, it is on the ASC Covered Procedures List and Medicare pays it in an ASC, and the supporting anesthesia is part of that episode. Procedures on Addendum EE are excluded from ASC payment. Anesthesia itself is reimbursed using base units, time, and applicable modifiers.

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