World Health Organization · 2026-01 · English
Diseases of the immune system
Official WHO ICD-11 MMS tabulation. This international classification is separate from US ICD-10-CM. For complete instructions and postcoordination, consult the WHO browser.
More specific codes
04Nonorgan specific systemic autoimmune disorders04Certain disorders involving the immune system04Autoinflammatory disorders04Primary immunodeficiencies04Allergic or hypersensitivity conditions04Immune system disorders involving white cell lineages4A20Acquired immunodeficiencies4B40Diseases of thymus4B4YOther specified diseases of the immune system4B4ZDiseases of the immune system, unspecified© World Health Organization · CC BY-ND 3.0 IGO