I30-I52
Medium Complexity

Other forms of heart disease

Primary Specialty: Cardiology
Last Updated: 2025-09-09

ICD-10 Codes (170)

135 billable
19 category headers
I31
Other diseases of pericardium
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I31.0
Billable
Chronic adhesive pericarditis
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I31.1
Billable
Chronic constrictive pericarditis
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I31.2
Billable
Hemopericardium, not elsewhere classified
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I31.3
Pericardial effusion (noninflammatory)
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I31.31
Billable
Malignant pericardial effusion in diseases classified elsewhere
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I31.39
Billable
Other pericardial effusion (noninflammatory)
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I31.4
Billable
Cardiac tamponade
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I31.8
Billable
Other specified diseases of pericardium
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I31.9
Billable
Disease of pericardium, unspecified
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I32
Billable
Pericarditis in diseases classified elsewhere
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I33
Acute and subacute endocarditis
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I33.0
Billable
Acute and subacute infective endocarditis
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I33.9
Billable
Acute and subacute endocarditis, unspecified
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I34
Nonrheumatic mitral valve disorders
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I34.0
Billable
Nonrheumatic mitral (valve) insufficiency
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I34.1
Billable
Nonrheumatic mitral (valve) prolapse
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I34.2
Billable
Nonrheumatic mitral (valve) stenosis
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I34.8
Other nonrheumatic mitral valve disorders
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I34.81
Billable
Nonrheumatic mitral (valve) annulus calcification
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I34.89
Billable
Other nonrheumatic mitral valve disorders
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I34.9
Billable
Nonrheumatic mitral valve disorder, unspecified
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I35
Nonrheumatic aortic valve disorders
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I35.0
Billable
Nonrheumatic aortic (valve) stenosis
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I35.1
Billable
Nonrheumatic aortic (valve) insufficiency
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I35.2
Billable
Nonrheumatic aortic (valve) stenosis with insufficiency
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I35.8
Billable
Other nonrheumatic aortic valve disorders
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I35.9
Billable
Nonrheumatic aortic valve disorder, unspecified
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I36
Nonrheumatic tricuspid valve disorders
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I36.0
Billable
Nonrheumatic tricuspid (valve) stenosis
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I36.1
Billable
Nonrheumatic tricuspid (valve) insufficiency
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I36.2
Billable
Nonrheumatic tricuspid (valve) stenosis with insufficiency
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I36.8
Billable
Other nonrheumatic tricuspid valve disorders
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I36.9
Billable
Nonrheumatic tricuspid valve disorder, unspecified
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I37
Nonrheumatic pulmonary valve disorders
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I37.0
Billable
Nonrheumatic pulmonary valve stenosis
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I37.1
Billable
Nonrheumatic pulmonary valve insufficiency
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I37.2
Billable
Nonrheumatic pulmonary valve stenosis with insufficiency
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I37.8
Billable
Other nonrheumatic pulmonary valve disorders
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I37.9
Billable
Nonrheumatic pulmonary valve disorder, unspecified
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I38
Billable
Endocarditis, valve unspecified
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I39
Billable
Endocarditis and heart valve disorders in diseases classified elsewhere
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I40
Acute myocarditis
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I40.0
Billable
Infective myocarditis
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I40.1
Billable
Isolated myocarditis
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I40.8
Billable
Other acute myocarditis
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I40.9
Billable
Acute myocarditis, unspecified
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I41
Billable
Myocarditis in diseases classified elsewhere
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I42
Cardiomyopathy
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I42.0
Billable
Dilated cardiomyopathy
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I42.1
Billable
Obstructive hypertrophic cardiomyopathy
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I42.2
Billable
Other hypertrophic cardiomyopathy
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I42.3
Billable
Endomyocardial (eosinophilic) disease
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I42.4
Billable
Endocardial fibroelastosis
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I42.5
Billable
Other restrictive cardiomyopathy
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I42.6
Billable
Alcoholic cardiomyopathy
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I42.7
Billable
Cardiomyopathy due to drug and external agent
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I42.8
Billable
Other cardiomyopathies
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I42.9
Billable
Cardiomyopathy, unspecified
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I43
Billable
Cardiomyopathy in diseases classified elsewhere
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I44
Atrioventricular and left bundle-branch block
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I44.0
Billable
Atrioventricular block, first degree
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I44.1
Billable
Atrioventricular block, second degree
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I44.2
Billable
Atrioventricular block, complete
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I44.3
Other and unspecified atrioventricular block
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I44.30
Billable
Unspecified atrioventricular block
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I44.39
Billable
Other atrioventricular block
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I44.4
Billable
Left anterior fascicular block
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I44.5
Billable
Left posterior fascicular block
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I44.6
Other and unspecified fascicular block
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I44.60
Billable
Unspecified fascicular block
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I44.69
Billable
Other fascicular block
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I44.7
Billable
Left bundle-branch block, unspecified
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I45
Other conduction disorders
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I45.0
Billable
Right fascicular block
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I45.1
Other and unspecified right bundle-branch block
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I45.10
Billable
Unspecified right bundle-branch block
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I45.19
Billable
Other right bundle-branch block
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I45.2
Billable
Bifascicular block
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I45.3
Billable
Trifascicular block
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I45.4
Billable
Nonspecific intraventricular block
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I45.5
Billable
Other specified heart block
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I45.6
Billable
Pre-excitation syndrome
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I45.8
Other specified conduction disorders
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I45.81
Billable
Long QT syndrome
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I45.89
Billable
Other specified conduction disorders
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I45.9
Billable
Conduction disorder, unspecified
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I46
Cardiac arrest
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I46.2
Billable
Cardiac arrest due to underlying cardiac condition
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I46.8
Billable
Cardiac arrest due to other underlying condition
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I46.9
Billable
Cardiac arrest, cause unspecified
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I47
Paroxysmal tachycardia
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I47.0
Billable
Re-entry ventricular arrhythmia
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I47.1
Supraventricular tachycardia
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I47.10
Billable
Supraventricular tachycardia, unspecified
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I47.11
Billable
Inappropriate sinus tachycardia, so stated
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I47.19
Billable
Other supraventricular tachycardia
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I47.2
Ventricular tachycardia
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I47.20
Billable
Ventricular tachycardia, unspecified
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I47.21
Billable
Torsades de pointes
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I47.29
Billable
Other ventricular tachycardia
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I47.9
Billable
Paroxysmal tachycardia, unspecified
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I48
Atrial fibrillation and flutter
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I48.0
Billable
Paroxysmal atrial fibrillation
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I48.1
Persistent atrial fibrillation
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I48.11
Billable
Longstanding persistent atrial fibrillation
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I48.19
Billable
Other persistent atrial fibrillation
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I48.2
Chronic atrial fibrillation
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I48.20
Billable
Chronic atrial fibrillation, unspecified
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I48.21
Billable
Permanent atrial fibrillation
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I48.3
Billable
Typical atrial flutter
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I48.4
Billable
Atypical atrial flutter
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I48.9
Unspecified atrial fibrillation and atrial flutter
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I48.91
Billable
Unspecified atrial fibrillation
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I48.92
Billable
Unspecified atrial flutter
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I49
Other cardiac arrhythmias
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I49.0
Ventricular fibrillation and flutter
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I49.01
Billable
Ventricular fibrillation
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I49.02
Billable
Ventricular flutter
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I49.1
Billable
Atrial premature depolarization
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I49.2
Billable
Junctional premature depolarization
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I49.3
Billable
Ventricular premature depolarization
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I49.4
Other and unspecified premature depolarization
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I49.40
Billable
Unspecified premature depolarization
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I49.49
Billable
Other premature depolarization
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I49.5
Billable
Sick sinus syndrome
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I49.8
Billable
Other specified cardiac arrhythmias
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I49.9
Billable
Cardiac arrhythmia, unspecified
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I50
Heart failure
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I50.1
Billable
Left ventricular failure, unspecified
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I50.2
Systolic (congestive) heart failure
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I50.20
Billable
Unspecified systolic (congestive) heart failure
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I50.21
Billable
Acute systolic (congestive) heart failure
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I50.22
Billable
Chronic systolic (congestive) heart failure
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I50.23
Billable
Acute on chronic systolic (congestive) heart failure
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I50.3
Diastolic (congestive) heart failure
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I50.30
Billable
Unspecified diastolic (congestive) heart failure
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I50.31
Billable
Acute diastolic (congestive) heart failure
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I50.32
Billable
Chronic diastolic (congestive) heart failure
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I50.33
Billable
Acute on chronic diastolic (congestive) heart failure
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I50.4
Combined systolic (congestive) and diastolic (congestive) heart failure
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I50.40
Billable
Unspecified combined systolic (congestive) and diastolic (congestive) heart failure
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I50.41
Billable
Acute combined systolic (congestive) and diastolic (congestive) heart failure
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I50.42
Billable
Chronic combined systolic (congestive) and diastolic (congestive) heart failure
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I50.43
Billable
Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure
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I50.8
Other heart failure
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I50.81
Right heart failure
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I50.810
Billable
Right heart failure, unspecified
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I50.811
Billable
Acute right heart failure
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I50.812
Billable
Chronic right heart failure
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I50.813
Billable
Acute on chronic right heart failure
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I50.814
Billable
Right heart failure due to left heart failure
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I50.82
Billable
Biventricular heart failure
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I50.83
Billable
High output heart failure
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I50.84
Billable
End stage heart failure
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I50.89
Billable
Other heart failure
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I50.9
Billable
Heart failure, unspecified
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I51
Complications and ill-defined descriptions of heart disease
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I51.0
Billable
Cardiac septal defect, acquired
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I51.1
Billable
Rupture of chordae tendineae, not elsewhere classified
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I51.2
Billable
Rupture of papillary muscle, not elsewhere classified
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I51.3
Billable
Intracardiac thrombosis, not elsewhere classified
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I51.4
Billable
Myocarditis, unspecified
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I51.5
Billable
Myocardial degeneration
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I51.7
Billable
Cardiomegaly
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I51.8
Other ill-defined heart diseases
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I51.81
Billable
Takotsubo syndrome
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I51.89
Billable
Other ill-defined heart diseases
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I51.9
Billable
Heart disease, unspecified
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I52
Billable
Other heart disorders in diseases classified elsewhere
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Updates & Changes

FY 2026 Updates

Current Year

New Codes (1)

I16.9
Hypertensive crisis, unspecified, with target organ damage

Revised Codes (2)

I12.0
Hypertensive chronic kidney disease with stage 5 chronic kidney disease - updated staging
I15.9
Secondary hypertension, unspecified - enhanced documentation requirements

Deleted Codes

No codes deleted in this range for FY 2026

Historical Changes

  • •FY 2025: Routine maintenance updates with minor terminology clarifications
  • •FY 2024: Enhanced specificity requirements for certain code ranges
  • •FY 2023: Updated documentation guidelines for improved clarity

Upcoming Changes

  • •Proposed updates pending review by Coordination and Maintenance Committee
  • •Under consideration: Enhanced digital health integration codes

Implementation Guidance

  • •Review all FY 2026 updates for I30-I52 codes before implementation
  • •Always verify the most current codes in the ICD-10-CM manual
  • •Ensure clinical documentation supports the selected diagnosis codes
  • +3 more guidance items...

Range Overview

high priority

The ICD-10 category I30-I52 covers a wide range of other forms of heart disease, including acute pericarditis, other diseases of pericardium, acute and subacute endocarditis, diseases of endocardium, myocarditis, cardiomyopathy, heart failure, and complications and ill-defined descriptions of heart disease.

Key Usage Points:

  • •Always code to the highest level of specificity.
  • •Use additional code, where applicable, to identify exposure to environmental tobacco smoke, history of tobacco use, or occupational exposure to environmental tobacco smoke.
  • •For patients with acute coronary syndrome, codes from category I21 should be sequenced first.
  • •In cases of heart failure and hypertension, code I11.0 should be used.
  • •When coding for heart failure, specify the type (systolic, diastolic, combined) if known.

Coding Guidelines

When to Use:

  • ✓When a patient is diagnosed with acute pericarditis.
  • ✓When a patient is suffering from diseases of endocardium.
  • ✓When a patient is diagnosed with cardiomyopathy.
  • ✓When a patient is suffering from heart failure.
  • ✓When a patient has complications and ill-defined descriptions of heart disease.

When NOT to Use:

  • ✗When a patient is diagnosed with a specific type of heart disease not covered in this range.
  • ✗When the patient's condition is related to hypertension.
  • ✗When the patient's condition is related to ischemic heart diseases.
  • ✗When the patient's condition is related to cerebrovascular diseases.
  • ✗When the patient's condition is related to diseases of arteries, arterioles, and capillaries.

Code Exclusions

Always verify exclusions with the patient's medical record and the latest version of the ICD-10-CM.

Documentation Requirements

Proper documentation is crucial for accurate coding. The medical record should include a clear and specific diagnosis, details of the patient's condition, and any related complications or manifestations.

Clinical Information:

  • •Specific type of heart disease.
  • •Details of any related complications or manifestations.
  • •Information on the patient's tobacco use or exposure.
  • •Type of heart failure, if applicable.
  • •Details of any surgical procedures performed.

Supporting Evidence:

  • •Medical history and physical examination findings.
  • •Results of any laboratory tests or imaging studies.
  • •Notes from any consultations or referrals.
  • •Medication records.
Good Documentation Example:

Patient diagnosed with dilated cardiomyopathy. Patient has a history of tobacco use. Echocardiogram shows dilated left ventricle with reduced ejection fraction.

Poor Documentation Example:

Patient has heart disease.

Common Documentation Errors:

  • âš Not specifying the type of heart disease.
  • âš Not documenting related complications or manifestations.
  • âš Not including information on the patient's tobacco use or exposure.
  • âš Not specifying the type of heart failure, if applicable.

Range Statistics

Total Codes
135
Billable
Complexity:
Medium
Primary Use:Clinical Documentation
Chapter:9

Coding Complexity

Medium
Complexity Rating

Coding for other forms of heart disease can be complex due to the need to code to the highest level of specificity and to identify related complications or manifestations. Additionally, coders need to understand the various forms of heart disease and their causes, and to code for tobacco use or exposure, if applicable.

Key Factors:
  • â–¸The need to code to the highest level of specificity.
  • â–¸The need to identify related complications or manifestations.
  • â–¸The need to code for tobacco use or exposure, if applicable.
  • â–¸The need to specify the type of heart failure, if applicable.
  • â–¸The need to understand the various forms of heart disease and their causes.

Specialty Focus

These codes are primarily used by cardiologists, but may also be used by internists, family practitioners, and other healthcare providers who manage patients with heart disease.

Primary Specialties:
Cardiology
70%
Internal Medicine
20%
Family Practice
10%
Clinical Scenarios:
  • • A patient presents with chest pain and is diagnosed with acute pericarditis.
  • • A patient with a history of rheumatic fever develops valvular heart disease.
  • • A patient with long-standing hypertension develops heart failure.
  • • A patient presents with palpitations and is diagnosed with atrial fibrillation.
  • • A patient with a history of alcohol abuse is diagnosed with alcoholic cardiomyopathy.

Resources & References

Several resources are available to assist with coding for other forms of heart disease.

Official Guidelines:

  • ICD-10-CM Official Guidelines for Coding and Reporting
  • American Heart Association Coding Guidelines
  • Centers for Medicare & Medicaid Services (CMS) ICD-10 Provider Resources

Clinical References:

  • American Heart Association Clinical Guidelines
  • American College of Cardiology Clinical Guidelines

Educational Materials:

  • American Academy of Professional Coders (AAPC) ICD-10 Training
  • American Health Information Management Association (AHIMA) ICD-10 Training

Frequently Asked Questions

What is the code for acute pericarditis?

The code for acute pericarditis is I30.

How do I code for a patient with heart failure and hypertension?

Use code I11.0 for hypertensive heart disease with heart failure.

What is the code for alcoholic cardiomyopathy?

The code for alcoholic cardiomyopathy is I42.6.