2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Cerebrovascular Disease 430-438 > 2008 ICD-9-CM Diagnosis 433 Occlusion and stenosis of precerebral arteries  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 Therefore, this code may be out of date.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 433 can be accessed here. 433 is a non-specific code that cannot be used to specify a diagnosis ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 433 includes: embolism of basilar, carotid, and vertebral arteries narrowing of basilar, carotid, and vertebral arteries obstruction of basilar, carotid, and vertebral arteries thrombosis of basilar, carotid, and vertebral arteries 433 excludes: insufficiency NOS of precerebral arteries (435.0-435.9)