2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Diseases Of Veins And Lymphatics, And Other Diseases Of Circulatory System 451-459 > Hypotension 458.* > 2008 ICD-9-CM Diagnosis 458.1 Chronic hypotension  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 Therefore, this code may be out of date.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 458.1 can be accessed here. 458.1 is a specific code that can be used to specify a diagnosis 458.1 contains 2 index entries View the ICD-9-CM Volume 1 458.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 458.1 also known as: Permanent idiopathic hypotension Index entries containing 458.1: Hypotension (arterial) (constitutional) 458.9 chronic 458.1 permanent idiopathic 458.1