2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Chronic Rheumatic Heart Disease 393-398 > ICD-9-CM Diagnosis 394 Diseases of mitral valve 394 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 394.0 Mitral stenosis A rheumatic disease causing diffuse thickening of the mitral valve leaflets by fibrous tissue or calcific deposits. 394.0 is a specific code that can be used to specify a diagnosis 394.0 contains 2 index entries ICD-9-CM Diagnosis 394.1 Rheumatic mitral insufficiency 394.1 is a specific code that can be used to specify a diagnosis 394.1 contains 1 index entry ICD-9-CM Diagnosis 394.2 Mitral stenosis with insufficiency 394.2 is a specific code that can be used to specify a diagnosis 394.2 contains 3 index entries ICD-9-CM Diagnosis 394.9 Other and unspecified mitral valve diseases 394.9 is a specific code that can be used to specify a diagnosis 394.9 contains 5 index entries