The Centers for Medicare & Medicaid Services (CMS) has posted the locale-specific Medicare Anesthesia Conversion Factors (CF) for services provided on/after January 1, 2020.  The national Medicare Anesthesia CF for 2020 is $22.2016.  The CF varies by locality according to the assigned, Geographic Practice Cost Index (GPCI). The CFs are accurate as of 10/29/2019 and reflect the expiration of the work GPCI floor of 1.00.  The numbers will change if Congress acts to reinstate that floor; it is not unusual for Congress to fix the GPCIs as part of an end of the year package.
 
Link to the 2020 Locality-Adjusted Anesthesia Conversion Factors:  https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/PhysicianFeeSched/Downloads/2020-Anesthesia-Conversion-Factors.zip