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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Other Forms Of Heart Disease 420-429 > Acute And Subacute Endocarditis 421.* > 2007 ICD-9-CM Diagnosis 421.9 Acute endocarditis unspecified  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 Therefore, this code may be out of date.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 421.9 can be accessed here. 421.9 is a specific code that can be used to specify a diagnosis 421.9 contains 8 index entries View the ICD-9-CM Volume 1 421.* hierarchy 421.9 also known as: Endocarditis, acute or subacute Myoendocarditis, acute or subacute Periendocarditis, acute or subacute 421.9 excludes: acute rheumatic endocarditis (391.1) Index entries containing 421.9: Endocarditis (chronic) (indeterminate) (interstitial) (marantis) (nonbacterial thrombotic) (residual) (sclerotic) (sclerous) (senile) (valvular) 424.90 acute or subacute 421.9 rheumatic (aortic) (mitral) (pulmonary) (tricuspid) 391.1 with chorea (acute) (rheumatic) (Sydenham's) 392.0 aortic (heart) (nonrheumatic) (valve) 424.1 acute or subacute 421.9 mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea) 394.9 nonrheumatic 424.0 acute or subacute 421.9 pulmonary (chronic) (heart) (valve) 424.3 acute or subacute 421.9 rheumatic 391.1 with chorea (acute) (rheumatic) (Sydenham's) 392.0 toxic (see also Endocarditis, acute) 421.9 tricuspid (chronic) (heart) (inactive) (rheumatic) (valve) (with chorea) 397.0 nonrheumatic 424.2 acute or subacute 421.9 Myoendocarditis - see also Endocarditis acute or subacute 421.9 Periendocarditis (see also Endocarditis) 424.90 acute or subacute 421.9