Anesthesia Conversion Factors - JE Part B
Anesthesia Conversion Factors
The Medicare approved amount for anesthesia service is calculated using the conversion factor for each calendar year listed below: (Anesthesia Base Units + Billed Minutes Divided by 15) x Conversion Factor = Allowed amount.
CMS website provides links to the anesthesia base units and regulations: Anesthesiologists Center
CMS Internet-Only Manual (IOM), Publication 100-04, Medicare Claims Processing Manual, Chapter 12, Section 50, provides anesthesia billing and payment information.
2025
The CY 2025 anesthesia conversion factor fees have been updated due to Section 3206 of the American Relief Act, 2025. The fees are effective for dates of service January 1, 2025 through December 31, 2025.
| State | Locality | Par | Non-Par | Limiting Charge |
|---|---|---|---|---|
| Hawaii | Hawaii/Pacific Island | $20.24 | $19.23 | $22.11 |
| Nevada | Nevada | $20.11 | $19.10 | $21.97 |
| Northern California | Area 05 - Alameda, Contra Costa, San Francisco, and San Mateo Counties | $22.37 | $21.25 | $24.44 |
| Northern California | Area 09 - Santa Clara County | $22.58 | $21.45 | $24.67 |
| Northern California | Area 51 - Napa County | $21.64 | $20.56 | $23.64 |
| Northern California | Area 52 - Marin County | $22.41 | $21.29 | $24.48 |
| Northern California | Area 53 - Solano County | $21.57 | $20.49 | $23.57 |
| Northern California | Area 54 - Kern County | $20.45 | $19.43 | $22.34 |
| Northern California | Area 55 - Butte County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 56 - Fresno County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 57 - Kings County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 58 - Madera County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 59 - Merced County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 60 - Stanislaus County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 61 - Shasta County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 62 - Riverside and San Bernardino Counties | $20.71 | $19.67 | $22.63 |
| Northern California | Area 63 - Placer and Sacramento Counties | $20.79 | $19.75 | $22.71 |
| Northern California | Area 64 - Monterey County | $20.84 | $19.80 | $22.77 |
| Northern California | Area 65 - San Benito County | $22.77 | $21.63 | $24.88 |
| Northern California | Area 66 - Santa Cruz County | $20.71 | $19.67 | $22.63 |
| Northern California | Area 67 - Sonoma County | $20.94 | $19.89 | $22.88 |
| Northern California | Area 68 - San Joaquin County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 69 - Tulare County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 70 - Sutter County | $20.27 | $19.26 | $22.14 |
| Northern California | Area 75 - All Other Counties | $20.27 | $19.26 | $22.14 |
| Southern California | Area 17 - Ventura County | $20.88 | $19.84 | $22.81 |
| Southern California | Area 18 - Los Angeles and Orange Counties | $21.22 | $20.16 | $23.18 |
| Southern California | Area 71 - Imperial County | $20.28 | $19.27 | $22.16 |
| Southern California | Area 72 - San Diego County | $20.83 | $19.79 | $22.76 |
| Southern California | Area 73 - San Luis Obispo County | $20.40 | $19.38 | $22.29 |
| Southern California | Area 74 - Santa Barbara County | $20.67 | $19.64 | $22.58 |
2024
The CY 2024 anesthesia conversion factor fees have been updated due to The Consolidated Appropriations Act, 2024. The fees are effective for dates of service March 9, 2024 through December 31, 2024.
| State | Locality | Par | Non-Par | Limiting Charge |
|---|---|---|---|---|
| Hawaii | Hawaii/Pacific Island | $20.69 | $19.66 | $22.60 |
| Nevada | Nevada | $20.57 | $19.54 | $22.47 |
| Northern California | Area 05 - Alameda, Contra Costa, San Francisco, and San Mateo Counties | $22.86 | $21.72 | $24.97 |
| Northern California | Area 09 - Santa Clara County | $23.07 | $21.92 | $25.20 |
| Northern California | Area 51 - Napa County | $22.11 | $21.00 | $24.16 |
| Northern California | Area 52 - Marin County | $22.89 | $21.75 | $25.01 |
| Northern California | Area 53 - Solano County | $22.05 | $20.95 | $24.09 |
| Northern California | Area 54 - Kern County | $20.91 | $19.86 | $22.84 |
| Northern California | Area 55 - Butte County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 56 - Fresno County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 57 - Kings County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 58 - Madera County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 59 - Merced County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 60 - Stanislaus County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 61 - Shasta County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 62 - Riverside and San Bernardino Counties | $21.17 | $20.11 | $23.13 |
| Northern California | Area 63 - Placer and Sacramento Counties | $21.26 | $20.20 | $23.23 |
| Northern California | Area 64 - Monterey County | $21.31 | $20.24 | $23.28 |
| Northern California | Area 65 - San Benito County | $23.26 | $22.10 | $25.41 |
| Northern California | Area 66 - Santa Cruz County | $21.17 | $20.11 | $23.13 |
| Northern California | Area 67 - Sonoma County | $21.40 | $20.33 | $23.38 |
| Northern California | Area 68 - San Joaquin County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 69 - Tulare County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 70 - Sutter County | $20.73 | $19.69 | $22.65 |
| Northern California | Area 75 - All Other Counties | $20.73 | $19.69 | $22.65 |
| Southern California | Area 17 - Ventura County | $21.34 | $20.27 | $23.31 |
| Southern California | Area 18 - Los Angeles and Orange Counties | $21.69 | $20.61 | $23.70 |
| Southern California | Area 71 - Imperial County | $20.74 | $19.70 | $22.66 |
| Southern California | Area 72 - San Diego County | $21.30 | $20.24 | $23.27 |
| Southern California | Area 73 - San Luis Obispo County | $20.86 | $19.82 | $22.79 |
| Southern California | Area 74 - Santa Barbara County | $21.13 | $20.07 | $23.08 |
CMS released the following anesthesia conversion factors that are effective for dates of service January 1, 2024 through March 8, 2024.
| State | Locality | Par | Non-Par | Limiting Charge |
|---|---|---|---|---|
| Hawaii | Hawaii/Pacific Islands | $20.35 | $19.33 | $22.23 |
| Nevada | Nevada | $20.23 | $19.22 | $22.10 |
| Northern California | Area 05 - Alameda, Contra Costa, San Francisco, San Mateo Counties | $22.49 | $21.37 | $24.57 |
| Northern California | Area 09 - Santa Clara County | $22.70 | $21.57 | $24.80 |
| Northern California | Area 51 - Napa County | $21.75 | $20.66 | $23.76 |
| Northern California | Area 52 - Marin County | $22.52 | $21.39 | $24.60 |
| Northern California | Area 53 - Solano County | $21.69 | $20.61 | $23.70 |
| Northern California | Area 54 - Kern County | $20.57 | $19.54 | $22.47 |
| Northern California | Area 55 - Butte County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 56 - Fresno County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 57 - Kings County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 58 - Madera County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 59 - Merced County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 60 - Stanislaus County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 61 - Shasta County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 62 - Riverside and San Bernardino Counties | $20.82 | $19.78 | $22.75 |
| Northern California | Area 63 - Placer and Sacramento Counties | $20.91 | $19.86 | $22.84 |
| Northern California | Area 64 - Monterey County | $20.96 | $19.91 | $22.90 |
| Northern California | Area 65 - San Benito County | $22.88 | $21.74 | $25.00 |
| Northern California | Area 66 - Santa Cruz County | $20.82 | $19.78 | $22.75 |
| Northern California | Area 67 - Sonoma County | $21.05 | $20.00 | $23.00 |
| Northern California | Area 68 - San Joaquin County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 69 - Tulare County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 70 - Sutter County | $20.39 | $19.37 | $22.28 |
| Northern California | Area 75 - All Other Counties | $20.39 | $19.37 | $22.28 |
| Southern California | Area 17 - Ventura County | $21.00 | $19.95 | $22.94 |
| Southern California | Area 18 - Los Angeles and Orange Counties | $21.34 | $20.27 | $23.31 |
| Southern California | Area 71 - Imperial County | $20.40 | $19.38 | $22.29 |
| Southern California | Area 72 - San Diego County | $20.95 | $19.90 | $22.89 |
| Southern California | Area 73 - San Luis Obispo County | $20.52 | $19.49 | $22.42 |
| Southern California | Area 74 - Santa Barbara County | $20.79 | $19.75 | $22.71 |
2023
CMS released the following anesthesia conversion factors that are effective for dates of service January 1, 2023 through December 31, 2023.
| State | Locality | Par | Non-Par | Limiting Charge |
|---|---|---|---|---|
| Hawaii | Hawaii/Pacific Islands | $21.18 | $20.12 | $23.14 |
| Nevada | Nevada | $21.25 | $20.19 | $23.22 |
| Northern California | Area 05 - San Francisco County | $23.04 | $21.89 | $25.17 |
| Northern California | Area 06 - San Mateo County | $23.04 | $21.89 | $25.17 |
| Northern California | Area 07 - Alameda and Contra Costa Counties | $23.04 | $21.89 | $25.17 |
| Northern California | Area 09 - Santa Clara County | $23.37 | $22.20 | $25.53 |
| Northern California | Area 51 - Napa County | $22.23 | $21.12 | $24.29 |
| Northern California | Area 52 - Marin County | $23.08 | $21.93 | $25.21 |
| Northern California | Area 53 - Solano County | $22.20 | $21.09 | $24.25 |
| Northern California | Area 54 - Kern County | $21.44 | $20.37 | $23.42 |
| Northern California | Area 55 - Butte County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 56 - Fresno County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 57 - Kings County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 58 - Madera County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 59 - Merced County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 60 - Stanislaus County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 61 - Shasta County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 62 - Riverside and San Bernardino Counties | $21.64 | $20.56 | $23.64 |
| Northern California | Area 63 - Placer and Sacramento Counties | $21.57 | $20.49 | $23.57 |
| Northern California | Area 64 - Monterey County | $21.91 | $20.81 | $23.94 |
| Northern California | Area 65 - San Benito County | $23.59 | $22.41 | $25.77 |
| Northern California | Area 66 - Santa Cruz County | $21.79 | $20.70 | $23.81 |
| Northern California | Area 67 - Sonoma County | $21.87 | $20.78 | $23.89 |
| Northern California | Area 68 - San Joaquin County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 69 - Tulare County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 70 - Sutter County | $21.19 | $20.13 | $23.15 |
| Northern California | Area 75 - All Other Counties | $21.19 | $20.13 | $23.15 |
| Southern California | Area 17 - Ventura County | $21.78 | $20.69 | $23.79 |
| Southern California | Area 18 - Los Angeles County | $22.14 | $21.03 | $24.19 |
| Southern California | Area 26 - Orange County | $22.14 | $21.03 | $24.19 |
| Southern California | Area 71 - Imperial County | $21.21 | $20.15 | $23.17 |
| Southern California | Area 72 - San Diego County | $21.73 | $20.64 | $23.74 |
| Southern California | Area 73 - San Luis Obispo County | $21.30 | $20.24 | $23.27 |
| Southern California | Area 74 - Santa Barbara County | $21.68 | $20.60 | $23.69 |
Resource
- CMS Anesthesiologists Center - View anesthesia conversion factors.
Last Updated Jan 09 , 2025
