|  I51 |  | Complications and ill-defined descriptions of heart disease   | 
	
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		| Excludes2 | heart disease specified as rheumatic (I00-I09) 
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		|  I51.0 |  | Cardiac septal defect, acquired |  
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| Acquired septal atrial defect (old) |  | Acquired septal auricular defect (old) |  | Acquired septal ventricular defect (old) |  
		| Excludes1 | cardiac septal defect as current complication following acute myocardial infarction (I23.1, I23.2) 
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		| age | Adult: [15-124] 
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		|  I51.1 |  | Rupture of chordae tendineae, not elsewhere classified |  
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		| Excludes1 | rupture of chordae tendineae as current complication following acute myocardial infarction (I23.4) 
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		|  I51.2 |  | Rupture of papillary muscle, not elsewhere classified |  
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		| Excludes1 | rupture of papillary muscle as current complication following acute myocardial infarction (I23.5) 
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		|  I51.3 |  | Intracardiac thrombosis, not elsewhere classified |  
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| Apical thrombosis (old) |  | Atrial thrombosis (old) |  | Auricular thrombosis (old) |  | Mural thrombosis (old) |  | Ventricular thrombosis (old) |  
		| Excludes1 | intracardiac thrombosis as current complication following acute myocardial infarction (I23.6) 
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		|  I51.4 |  | Myocarditis, unspecified |  
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| Chronic (interstitial) myocarditis |  | Myocardial fibrosis |  | Myocarditis NOS |  
		| Excludes1 | acute or subacute myocarditis (I40.-) 
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		|  I51.5 |  | Myocardial degeneration |  
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| Fatty degeneration of heart or myocardium |  | Myocardial disease |  | Senile degeneration of heart or myocardium |  
		| Excludes1 | myocardial degeneration due to hypertension (I11.-) myocardial degeneration due to hypertension and chronic kidney disease (I13.-)
 
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		|  I51.7 |  | Cardiomegaly |  
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| Cardiac dilatation |  | Cardiac hypertrophy |  | Ventricular dilatation |  
		| Excludes1 | cardiomegaly due to hypertension (I11.-) cardiomegaly due to hypertension and chronic kidney disease (I13.-)
 
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		|  I51.8 |  | Other ill-defined heart diseases |  |  |  | 
	
		|  I51.81 |  | Takotsubo syndrome |  
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| Reversible left ventricular dysfunction following sudden emotional stress |  | Stress induced cardiomyopathy |  | Takotsubo cardiomyopathy |  | Transient left ventricular apical ballooning syndrome |  |  |  |  |  | 
	
		|  I51.89 |  | Other ill-defined heart diseases |  
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| Carditis (acute)(chronic) |  | Pancarditis (acute)(chronic) |  |  |  | 
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		|  I51.9 |  | Heart disease, unspecified |  |