M31 - Other necrotizing vasculopathies
M31.0 - Hypersensitivity angiitis
M31.1 - Thrombotic microangiopathy
M31.2 - Lethal midline granuloma
M31.3 - Wegener's granulomatosis
M31.30 - Wegener's granulomatosis without renal involvement
M31.31 - Wegener's granulomatosis with renal involvement
M31.4 - Aortic arch syndrome [Takayasu]
M31.5 - Giant cell arteritis with polymyalgia rheumatica
M31.6 - Other giant cell arteritis
M31.7 - Microscopic polyangiitis
M31.8 - Other specified necrotizing vasculopathies
M31.9 - Necrotizing vasculopathy, unspecified