2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Diseases Of Arteries, Arterioles, And Capillaries 440-448 > Polyarteritis Nodosa And Allied Conditions 446.* > 2006 ICD-9-CM Diagnosis 446.20 Hypersensitivity angiitis unspecified View the most recent version of ICD-9-CM 446.20 Heterogeneous group of disorders characterized by a vasculitic syndrome presumed to be associated with a hypersensitivity reaction following exposure to an antigen such as an infectious agent, a drug, or other foreign or endogenous substance (Wilson et al, Harrison's Principles of Internal Medicine, 12th ed, p1459). 446.20 is a specific code that can be used to specify a diagnosis 446.20 contains 5 index entries View the ICD-9-CM Volume 1 446.* hierarchy  Index entries containing 446.20: Angiitis 447.6 hypersensitivity 446.20 Goodpasture's syndrome 446.21 specified NEC 446.29 Arteritis 447.6 allergic (see also Angiitis, hypersensitivity) 446.20 Collagen disease NEC 710.9 vascular (allergic) (see also Angiitis, hypersensitivity) 446.20 Disease, diseased - see also Syndrome collagen NEC 710.9 vascular (allergic) (see also Angiitis, hypersensitivity) 446.20 Hypersensitive, hypersensitiveness, hypersensitivity - see also Allergy angiitis 446.20 specified NEC 446.29