Access CMS-level guidance for anesthesia services through the following links.
- CMS 'Anesthesiologists Center'
- Includes a spreadsheet of base units by CPT code and current year Anesthesia Conversion Factor
- CMS Medicare Claims Processing Manual (Pub. 100-04), Chapter 12 (PDF, 902 KB)
- Definitions of personally performed, medically directed and medically supervised: section 50
- Definition of concurrent procedures: section 50J
- Anesthesia modifiers: section 50K
- Base units for anesthesia services: following section 50K: Exhibit 1
- Anesthesia and Teaching Facilities: section 100.1.2.A.4
- CRNA Services: section 140