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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > 2008 ICD-9-CM Diagnosis 424 Other diseases of endocardium  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 Therefore, this code may be out of date.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 424 can be accessed here. 424 is a non-specific code that cannot be used to specify a diagnosis 424 excludes: bacterial endocarditis (421.0-421.9) rheumatic endocarditis (391.1, 394.0-397.9) syphilitic endocarditis (093.20-093.24)