California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4.5 - Division of Workers' Compensation
Subchapter 1 - Administrative Director-Administrative Rules
Article 5.3 - Official Medical Fee Schedule
Section 9789.18.8 - Anesthesia - Time and Calculation of Anesthesia Time Units

(a) Anesthesia time is defined as the period during which an anesthesia practitioner is present with the patient. It starts when the anesthesia practitioner begins to prepare the patient for anesthesia services in the operating room or an equivalent area and ends when the anesthesia practitioner is no longer furnishing anesthesia services to the patient, that is, when the patient may be placed safely under postoperative care. Anesthesia time is a continuous time period from the start of anesthesia to the end of an anesthesia service. In counting anesthesia time, the anesthesia practitioner can add blocks of time around an interruption in anesthesia time as long as the anesthesia practitioner is furnishing continuous anesthesia care within the time periods around the interruption.

(b) Time units are computed by dividing the actual reported anesthesia time by 15 minutes. Round the time unit to one decimal place.

(c) Time units are not allowed for CPT code 01996.

For purposes of this section, "anesthesia practitioner" means a physician who performs the anesthesia service alone, a CRNA who is not medically directed, or a CRNA or AA, who is medically directed. The physician who medically directs the CRNA or AA would ordinarily report the same time as the CRNA or AA reports for the CRNA service.