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.

 

2024

CMS released the following anesthesia conversion factors that are effective for dates of service January 1, 2024 through December 31, 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

2022

The CY 2022 Anesthesia Conversion Factor fees have been updated due to the Protecting Medicare and American Farmers from Sequestor Cuts Act. The fees are valid for dates of service January 1, 2022 - December 31, 2022.

State Locality Par Non-Par Limiting Charge
Alaska Alaska $29.81 $28.32 $32.57
Arizona Arizona $21.20 $20.14 $23.16
Idaho Idaho $20.34 $19.32 $22.22
Montana Montana $21.53 $20.45 $23.52
North Dakota North Dakota $20.79 $19.75 $22.71
Oregon Oregon - Area 01 - Portland $21.52 $20.44 $23.51
Oregon Oregon - Area 99 - Rest of Oregon $20.75 $19.71 $22.67
South Dakota South Dakota $20.68 $19.65 $22.59
Utah Utah $21.01 $19.96 $22.95
Washington Washington - Area 02 - Seattle (King County) $22.53 $21.40 $24.61
Washington Washington - Area 99 - Rest of Washington $21.26 $20.20 $23.23
Wyoming Wyoming $21.35 $20.28 $23.32

Resource

Last Updated Dec 29 , 2023