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 > Phlebitis And Thrombophlebitis 451.* > 2008 ICD-9-CM Diagnosis 451.8 Phlebitis and thrombophlebitis of other sites  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 Therefore, this code may be out of date.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 451.8 can be accessed here. 451.8 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 451.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 451.8 excludes: intracranial venous sinus (325) nonpyogenic (437.6) portal (vein) (572.1)