Loading codelists and analyzing usage...
Explore codelists, versions, and usage across OpenSAFELY repos
This tool allows you to explore the codelists used by OpenSAFELY studies. It shows which codelists are being used, their versions, status, and which variables and repositories reference them. The data was extracted on 2025-10-10.
Codelist View: Groups information by codelist, showing all versions, the variables that use them, and the repositories where they appear. Expand any row to see the version in use in OpenSAFELY.
Repo View: A flattened table showing every ehrQL variable used in OpenSAFELY and the associated codelist version. Useful for filtering and sorting by repository, variable name and codelist name.
Data is extracted from OpenCodelists and cross-referenced with job execution data from OpenSAFELY repositories. This includes publication status, coding system releases, and usage timestamps to help identify active vs. deprecated codelists.