ICD-11 classes
04 Diseases of the immune system
Nonorgan specific systemic autoimmune disorders
4A44 — Vasculitis
4A44.A — Antineutrophil cytoplasmic antibody-associated vasculitis
4A44.A0 — Microscopic polyangiitis
ICD-11 4A44.A0 — Microscopic polyangiitis
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.
It includes 1 item.
- Microscopic polyarteritis
It excludes 1 item.
- Polyarteritis nodosa (4A44.4)
It has no clarifying diagnoses.
The diagnosis is coded elsewhere: