Anesthesia Conversion Factors - JF 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
CMS released the following anesthesia conversion factors that are effective for dates of service January 1, 2025 through December 31, 2025.
| State | Locality | Par | Non-Par | Limiting Charge |
|---|---|---|---|---|
| Alaska | Alaska | $27.86 | $26.47 | $30.44 |
| Arizona | Arizona | $19.74 | $18.75 | $21.57 |
| Idaho | Idaho | $18.62 | $17.69 | $20.34 |
| Montana | Montana | $19.71 | $18.72 | $21.53 |
| North Dakota | North Dakota | $19.35 | $18.38 | $21.14 |
| Oregon | Oregon - Area 01 - Portland | $20.46 | $19.44 | $22.35 |
| Oregon | Oregon - Area 99 - Rest of Oregon | $19.46 | $18.49 | $21.26 |
| South Dakota | South Dakota | $19.10 | $18.15 | $20.87 |
| Utah | Utah | $19.41 | $18.44 | $21.21 |
| Washington | Washington - Area 02 - Seattle (King County) | $21.54 | $20.46 | $23.53 |
| Washington | Washington - Area 99 - Rest of Washington | $20.30 | $19.29 | $22.18 |
| Wyoming | Wyoming | $19.57 | $18.59 | $21.38 |
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 |
|---|---|---|---|---|
| Alaska | Alaska | $28.54 | $27.11 | $31.18 |
| Arizona | Arizona | $20.50 | $19.48 | $22.40 |
| Idaho | Idaho | $19.75 | $18.76 | $21.58 |
| Montana | Montana | $20.74 | $19.70 | $22.66 |
| North Dakota | North Dakota | $20.13 | $19.12 | $21.99 |
| Oregon | Oregon - Area 01 - Portland | $20.91 | $19.86 | $22.84 |
| Oregon | Oregon - Area 99 - Rest of Oregon | $20.25 | $19.24 | $22.12 |
| South Dakota | South Dakota | $19.95 | $18.95 | $21.80 |
| Utah | Utah | $20.46 | $19.44 | $22.35 |
| Washington | Washington - Area 02 - Seattle (King County) | $22.01 | $20.91 | $24.05 |
| Washington | Washington - Area 99 - Rest of Washington | $20.76 | $19.72 | $22.68 |
| Wyoming | Wyoming | $20.43 | $19.41 | $22.32 |
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 |
|---|---|---|---|---|
| Alaska | Alaska | $28.08 | $26.68 | $30.68 |
| Arizona | Arizona | $20.16 | $19.15 | $22.02 |
| Idaho | Idaho | $19.43 | $18.46 | $21.23 |
| Montana | Montana | $20.41 | $19.39 | $22.30 |
| North Dakota | North Dakota | $19.80 | $18.81 | $21.63 |
| Oregon | Oregon - Area 01 - Portland | $20.57 | $19.54 | $22.47 |
| Oregon | Oregon - Area 99 - Rest of Oregon | $19.92 | $18.92 | $21.76 |
| South Dakota | South Dakota | $19.63 | $18.65 | $21.45 |
| Utah | Utah | $20.12 | $19.11 | $21.98 |
| Washington | Washington - Area 02 - Seattle (King County) | $21.65 | $20.57 | $23.65 |
| Washington | Washington - Area 99 - Rest of Washington | $20.42 | $19.40 | $22.31 |
| Wyoming | Wyoming | $20.09 | $19.09 | $21.95 |
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 |
|---|---|---|---|---|
| Alaska | Alaska | $29.14 | $27.68 | $31.84 |
| Arizona | Arizona | $20.81 | $19.77 | $22.73 |
| Idaho | Idaho | $19.53 | $18.55 | $21.34 |
| Montana | Montana | $20.58 | $19.55 | $22.48 |
| North Dakota | North Dakota | $20.44 | $19.42 | $22.33 |
| Oregon | Oregon - Area 01 - Portland | $21.20 | $20.14 | $23.16 |
| Oregon | Oregon - Area 99 - Rest of Oregon | $20.47 | $19.45 | $22.36 |
| South Dakota | South Dakota | $20.29 | $19.28 | $22.17 |
| Utah | Utah | $20.69 | $19.66 | $22.60 |
| Washington | Washington - Area 02 - Seattle (King County) | $22.23 | $21.12 | $24.29 |
| Washington | Washington - Area 99 - Rest of Washington | $20.97 | $19.92 | $22.91 |
| Wyoming | Wyoming | $20.85 | $19.81 | $22.78 |
Resource
- CMS Anesthesiologists Center - View anesthesia conversion factors.
