ICD-11 MMS

04 Diseases of the immune system

Nonorgan specific systemic autoimmune disorders  (4A40-4A4Z)

4A44 Vasculitis

4A44.A Antineutrophil cytoplasmic antibody-associated vasculitis

4A44.A0 Microscopic polyangiitis

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01


Necrotizing vasculitis, with few or no immune deposits, predominantly affecting small vessels (i.e., capillaries, venules, or arterioles). Necrotizing arteritis involving small and medium sized arteries may be present. Necrotizing glomerulonephritis is very common. Pulmonary capillaritis often occurs. Granulomatous inflammation is absent.

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