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- 2024 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for CY 2024.
- 2023 Anesthesia Conversion Factors (ZIP) (Updated 01/06/2023) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for CY 2023
- 2022 Anesthesia Conversion Factors (ZIP) (updated 12/20/21) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2022 Anesthesia base units by CPT code (ZIP) - These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999
- 2021 Anesthesia Conversion Factors (ZIP) - (Updated 12/29/2020) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for CY 2021.
- 2020 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for CY 2020.
- 2019 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for CY 2019.
- 2018 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2018 Anesthesia Base Units by CPT Code (ZIP) - These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2017 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for 2017.
- 2016 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for 2016.
- 2015 Anesthesia Conversion Factors (July 1- Dec 31) (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- The anesthesia base units are unchanged for 2015.
- 2015 Anesthesia Conversion Factors (Jan 1 – June 30) (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999. (Updated 1/6/2015)
- The anesthesia base units are unchanged for 2015.
- 2014 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999. (Updated 1/3/2014)
- 2014 Anesthesia Base Units by CPT Code (ZIP) - These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2013 Anesthesia Conversion Factors (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999. (Updated 12/31/2012)
- 2013 Anesthesia Base Units by CPT Code (ZIP) - These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2012 Anesthesia Conversion Factor 0% Update (ZIP) - These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999. (Updated 3/1/12)
- 2012 Anesthesia Base Units by CPT Code (ZIP) These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2011 Anesthesia Base Units by CPT Code (ZIP) These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2011 Anesthesia Conversion Factor (ZIP) These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999 (updated 4/2/12).
- 2010 Anesthesia Base Units by CPT Code (ZIP) These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2010 Anesthesia Conversion Factor 0% update and 2010 Anesthesia Conversion Factor 2.2% update . These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999. - cannot link dynamic list details
- 2009 Anesthesia Base Units by CPT Code (ZIP) These are the anesthesia base units used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
- 2009 Anesthesia Conversion Factor (ZIP) These are the anesthesia conversion factors used to compute allowable amounts for anesthesia services under CPT codes 00100 to 01999.
Participation
- Title 42 - Public Health, Chapter IV CMS/DHHS: Conditions of Participation -
- Appendix A of the State Operations Manual, pages 31-35 (PDF) - Anesthesia Services -- Appendix A (482.52)
- Services of a certified registered nurse anesthetist or an anesthesiologist's assistant: Basic rule and definitions.
- (Title 42 - Public Health, Chapter IV CMS/DHHS)
- Fourteen states have chosen to opt-out of the CRNA physician supervision regulation -- See Spotlight in the Spotlight for those states.
CMS Manuals & Transmittals
- Medicare Claims Processing Manual
- Payment for Anesthesiology Services Medicare Claims Processing Manual (Chapter 12; Physician/Nonphysician Practitioners) (PDF) (See Sub-Section K - Anesthesia Claims Claims Modifiers) contains the amount physicians and other providers will receive when providing services to a Medicare beneficiary
- Transmittals
- Medicare National Correct Coding Initiative (NCCI) Edits
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