Taxonomies

Taxonomies are large, externally owned code sets that we republish but don't maintain. Unlike enums (small, closed sets we control), taxonomies can run to tens of thousands of values. Open one to search its codes.

We republish these values verbatim from their owning authority. We never modify codes or labels, and versions track the upstream release.

  • Diagnosis Categories
    AAPC diagnosis taxonomy laddered up from ICD-10-CM codes.
    23,539 values
    AAPC · 2026
  • Procedure Categories
    AAPC procedure taxonomy laddered up from CPT, HCPCS Level II & ICD-10-PCS codes.
    1,811 values
    AAPC · 2026