2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Chronic Rheumatic Heart Disease 393-398 > 2008 ICD-9-CM Diagnosis 396 Diseases of mitral and aortic valves  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 Therefore, this code may be out of date.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 396 can be accessed here. 396 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. 396 includes: involvement of both mitral and aortic valves, whether specified as rheumatic or not