CMS Anesthesia base units: January 2022 release
The official CMS file behind our Anesthesia base units data, published January 2022 and in effect until CMS publishes a revision. The base units per anesthesia CPT code that anchor the anesthesia payment formula. Published irregularly — only when the units actually change, which is rare.
Get the file from CMS
Direct download: 2022-anesthesia-base-units-cpt-code.zip
SHA-256 of the file we ingested: 3fbb43abb6ef2f4ba7680995c94572d7cc69f503a1c123264565223b2e2502d1
Direct CMS links rot when cms.gov reorganizes — the stable fallback is the official CMS Anesthesia base units page.
Files inside this release
The member files we parsed, exactly as recorded at ingest — row counts and checksums let anyone verify our copy against CMS's. Where the name is a link, it downloads the exact bytes we parsed, straight out of the CMS zip.
| File | What it is | Rows |
|---|---|---|
|
Section 508 compliant version of CY_2022_Anesthesia_Base_Units_110921.txt
2 KB
SHA-256 ebbf7d42ecaf…
|
Anesthesia base units by CPT code | 276 |
What the columns mean
CMS ships these files with minimal documentation, and both the column names and their order drift between releases — which is why we parse by header name, never by position. Any column position shown here is the one we recorded when parsing this release.
Anesthesia base units by CPT code
Open Section 508 compliant version of CY_2022_Anesthesia_Base_Units_110921.txt (2 KB)One row per anesthesia CPT code: the base units reflecting the procedure's complexity, which anchor the anesthesia payment formula before time units are added. CMS publishes this file irregularly — only when base units actually change, which is rare.
| # | Column | What it means |
|---|---|---|
| 1 | Code | The anesthesia CPT code (00100–01999 range). |
| 2 | Base units | The complexity units for the procedure, summed with time units and multiplied by the locality's anesthesia conversion factor. |
What this release backs on this site
These base units back the anesthesia payment estimates on our code pages. Ingested Jul 10, 2026. See the full pipeline in our methodology.