2008 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.* > 2008 ICD-9-CM Diagnosis 446.2 Hypersensitivity angiitis  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 446.2 can be accessed here. 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). 446.2 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 446.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 446.2 excludes: antiglomerular basement membrane disease without pulmonary hemorrhage (583.89)