ICD-10-CM Section · I30-I5A
Other forms of heart disease
176 codes in this section
176
Total Codes
140
Billable
36
Header (Non-Billable)
24
Top-Level Codes
About Section I30-I5A
Section I30-I5A (I30-I5A) covers other forms of heart disease. It sits within the Diseases of the circulatory system chapter (I00-I99). This section contains 176 ICD-10-CM codes, 140 billable diagnoses you can submit on a claim, and 36 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in I30-I5A
Grouped by 3-character root code. Click any code for full detail.
I30
Acute pericarditis
4 subcodes
| I30.0 | Acute nonspecific idiopathic pericarditis | Billable |
| I30.1 | Infective pericarditis | Billable |
| I30.8 | Other forms of acute pericarditis | Billable |
| I30.9 | Acute pericarditis, unspecified | Billable |
I31
Other diseases of pericardium
9 subcodes
| I31.0 | Chronic adhesive pericarditis | Billable |
| I31.1 | Chronic constrictive pericarditis | Billable |
| I31.2 | Hemopericardium, not elsewhere classified | Billable |
| I31.3 | Pericardial effusion (noninflammatory) | Header |
| I31.31 | Malignant pericardial effusion in diseases classified elsewhere | Billable |
| I31.39 | Other pericardial effusion (noninflammatory) | Billable |
| I31.4 | Cardiac tamponade | Billable |
| I31.8 | Other specified diseases of pericardium | Billable |
| I31.9 | Disease of pericardium, unspecified | Billable |
I32
Pericarditis in diseases classified elsewhere
0 subcodes
I33
Acute and subacute endocarditis
2 subcodes
| I33.0 | Acute and subacute infective endocarditis | Billable |
| I33.9 | Acute and subacute endocarditis, unspecified | Billable |
I34
Nonrheumatic mitral valve disorders
7 subcodes
| I34.0 | Nonrheumatic mitral (valve) insufficiency | Billable |
| I34.1 | Nonrheumatic mitral (valve) prolapse | Billable |
| I34.2 | Nonrheumatic mitral (valve) stenosis | Billable |
| I34.8 | Other nonrheumatic mitral valve disorders | Header |
| I34.81 | Nonrheumatic mitral (valve) annulus calcification | Billable |
| I34.89 | Other nonrheumatic mitral valve disorders | Billable |
| I34.9 | Nonrheumatic mitral valve disorder, unspecified | Billable |
I35
Nonrheumatic aortic valve disorders
5 subcodes
| I35.0 | Nonrheumatic aortic (valve) stenosis | Billable |
| I35.1 | Nonrheumatic aortic (valve) insufficiency | Billable |
| I35.2 | Nonrheumatic aortic (valve) stenosis with insufficiency | Billable |
| I35.8 | Other nonrheumatic aortic valve disorders | Billable |
| I35.9 | Nonrheumatic aortic valve disorder, unspecified | Billable |
I36
Nonrheumatic tricuspid valve disorders
5 subcodes
| I36.0 | Nonrheumatic tricuspid (valve) stenosis | Billable |
| I36.1 | Nonrheumatic tricuspid (valve) insufficiency | Billable |
| I36.2 | Nonrheumatic tricuspid (valve) stenosis with insufficiency | Billable |
| I36.8 | Other nonrheumatic tricuspid valve disorders | Billable |
| I36.9 | Nonrheumatic tricuspid valve disorder, unspecified | Billable |
I37
Nonrheumatic pulmonary valve disorders
5 subcodes
| I37.0 | Nonrheumatic pulmonary valve stenosis | Billable |
| I37.1 | Nonrheumatic pulmonary valve insufficiency | Billable |
| I37.2 | Nonrheumatic pulmonary valve stenosis with insufficiency | Billable |
| I37.8 | Other nonrheumatic pulmonary valve disorders | Billable |
| I37.9 | Nonrheumatic pulmonary valve disorder, unspecified | Billable |
I38
Endocarditis, valve unspecified
0 subcodes
I39
Endocarditis and heart valve disorders in diseases classified elsewhere
0 subcodes
I40
Acute myocarditis
4 subcodes
| I40.0 | Infective myocarditis | Billable |
| I40.1 | Isolated myocarditis | Billable |
| I40.8 | Other acute myocarditis | Billable |
| I40.9 | Acute myocarditis, unspecified | Billable |
I41
Myocarditis in diseases classified elsewhere
0 subcodes
I42
Cardiomyopathy
10 subcodes
| I42.0 | Dilated cardiomyopathy | Billable |
| I42.1 | Obstructive hypertrophic cardiomyopathy | Billable |
| I42.2 | Other hypertrophic cardiomyopathy | Billable |
| I42.3 | Endomyocardial (eosinophilic) disease | Billable |
| I42.4 | Endocardial fibroelastosis | Billable |
| I42.5 | Other restrictive cardiomyopathy | Billable |
| I42.6 | Alcoholic cardiomyopathy | Billable |
| I42.7 | Cardiomyopathy due to drug and external agent | Billable |
| I42.8 | Other cardiomyopathies | Billable |
| I42.9 | Cardiomyopathy, unspecified | Billable |
I43
Cardiomyopathy in diseases classified elsewhere
0 subcodes
I44
Atrioventricular and left bundle-branch block
12 subcodes
| I44.0 | Atrioventricular block, first degree | Billable |
| I44.1 | Atrioventricular block, second degree | Billable |
| I44.2 | Atrioventricular block, complete | Billable |
| I44.3 | Other and unspecified atrioventricular block | Header |
| I44.30 | Unspecified atrioventricular block | Billable |
| I44.39 | Other atrioventricular block | Billable |
| I44.4 | Left anterior fascicular block | Billable |
| I44.5 | Left posterior fascicular block | Billable |
| I44.6 | Other and unspecified fascicular block | Header |
| I44.60 | Unspecified fascicular block | Billable |
| I44.69 | Other fascicular block | Billable |
| I44.7 | Left bundle-branch block, unspecified | Billable |
I45
Other conduction disorders
13 subcodes
| I45.0 | Right fascicular block | Billable |
| I45.1 | Other and unspecified right bundle-branch block | Header |
| I45.10 | Unspecified right bundle-branch block | Billable |
| I45.19 | Other right bundle-branch block | Billable |
| I45.2 | Bifascicular block | Billable |
| I45.3 | Trifascicular block | Billable |
| I45.4 | Nonspecific intraventricular block | Billable |
| I45.5 | Other specified heart block | Billable |
| I45.6 | Pre-excitation syndrome | Billable |
| I45.8 | Other specified conduction disorders | Header |
| I45.81 | Long QT syndrome | Billable |
| I45.89 | Other specified conduction disorders | Billable |
| I45.9 | Conduction disorder, unspecified | Billable |
I46
Cardiac arrest
3 subcodes
| I46.2 | Cardiac arrest due to underlying cardiac condition | Billable |
| I46.8 | Cardiac arrest due to other underlying condition | Billable |
| I46.9 | Cardiac arrest, cause unspecified | Billable |
I47
Paroxysmal tachycardia
10 subcodes
| I47.0 | Re-entry ventricular arrhythmia | Billable |
| I47.1 | Supraventricular tachycardia | Header |
| I47.10 | Supraventricular tachycardia, unspecified | Billable |
| I47.11 | Inappropriate sinus tachycardia, so stated | Billable |
| I47.19 | Other supraventricular tachycardia | Billable |
| I47.2 | Ventricular tachycardia | Header |
| I47.20 | Ventricular tachycardia, unspecified | Billable |
| I47.21 | Torsades de pointes | Billable |
| I47.29 | Other ventricular tachycardia | Billable |
| I47.9 | Paroxysmal tachycardia, unspecified | Billable |
I48
Atrial fibrillation and flutter
12 subcodes
| I48.0 | Paroxysmal atrial fibrillation | Billable |
| I48.1 | Persistent atrial fibrillation | Header |
| I48.11 | Longstanding persistent atrial fibrillation | Billable |
| I48.19 | Other persistent atrial fibrillation | Billable |
| I48.2 | Chronic atrial fibrillation | Header |
| I48.20 | Chronic atrial fibrillation, unspecified | Billable |
| I48.21 | Permanent atrial fibrillation | Billable |
| I48.3 | Typical atrial flutter | Billable |
| I48.4 | Atypical atrial flutter | Billable |
| I48.9 | Unspecified atrial fibrillation and atrial flutter | Header |
| I48.91 | Unspecified atrial fibrillation | Billable |
| I48.92 | Unspecified atrial flutter | Billable |
I49
Other cardiac arrhythmias
12 subcodes
| I49.0 | Ventricular fibrillation and flutter | Header |
| I49.01 | Ventricular fibrillation | Billable |
| I49.02 | Ventricular flutter | Billable |
| I49.1 | Atrial premature depolarization | Billable |
| I49.2 | Junctional premature depolarization | Billable |
| I49.3 | Ventricular premature depolarization | Billable |
| I49.4 | Other and unspecified premature depolarization | Header |
| I49.40 | Unspecified premature depolarization | Billable |
| I49.49 | Other premature depolarization | Billable |
| I49.5 | Sick sinus syndrome | Billable |
| I49.8 | Other specified cardiac arrhythmias | Billable |
| I49.9 | Cardiac arrhythmia, unspecified | Billable |
I50
Heart failure
28 subcodes
| I50.1 | Left ventricular failure, unspecified | Billable |
| I50.2 | Systolic (congestive) heart failure | Header |
| I50.20 | Unspecified systolic (congestive) heart failure | Billable |
| I50.21 | Acute systolic (congestive) heart failure | Billable |
| I50.22 | Chronic systolic (congestive) heart failure | Billable |
| I50.23 | Acute on chronic systolic (congestive) heart failure | Billable |
| I50.3 | Diastolic (congestive) heart failure | Header |
| I50.30 | Unspecified diastolic (congestive) heart failure | Billable |
| I50.31 | Acute diastolic (congestive) heart failure | Billable |
| I50.32 | Chronic diastolic (congestive) heart failure | Billable |
| I50.33 | Acute on chronic diastolic (congestive) heart failure | Billable |
| I50.4 | Combined systolic (congestive) and diastolic (congestive) heart failure | Header |
| I50.40 | Unspecified combined systolic (congestive) and diastolic (congestive) heart failure | Billable |
| I50.41 | Acute combined systolic (congestive) and diastolic (congestive) heart failure | Billable |
| I50.42 | Chronic combined systolic (congestive) and diastolic (congestive) heart failure | Billable |
| I50.43 | Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure | Billable |
| I50.8 | Other heart failure | Header |
| I50.81 | Right heart failure | Header |
| I50.810 | Right heart failure, unspecified | Billable |
| I50.811 | Acute right heart failure | Billable |
| I50.812 | Chronic right heart failure | Billable |
| I50.813 | Acute on chronic right heart failure | Billable |
| I50.814 | Right heart failure due to left heart failure | Billable |
| I50.82 | Biventricular heart failure | Billable |
| I50.83 | High output heart failure | Billable |
| I50.84 | End stage heart failure | Billable |
| I50.89 | Other heart failure | Billable |
| I50.9 | Heart failure, unspecified | Billable |
I51
Complications and ill-defined descriptions of heart disease
11 subcodes
| I51.0 | Cardiac septal defect, acquired | Billable |
| I51.1 | Rupture of chordae tendineae, not elsewhere classified | Billable |
| I51.2 | Rupture of papillary muscle, not elsewhere classified | Billable |
| I51.3 | Intracardiac thrombosis, not elsewhere classified | Billable |
| I51.4 | Myocarditis, unspecified | Billable |
| I51.5 | Myocardial degeneration | Billable |
| I51.7 | Cardiomegaly | Billable |
| I51.8 | Other ill-defined heart diseases | Header |
| I51.81 | Takotsubo syndrome | Billable |
| I51.89 | Other ill-defined heart diseases | Billable |
| I51.9 | Heart disease, unspecified | Billable |
I52
Other heart disorders in diseases classified elsewhere
0 subcodes
I5A
Non-ischemic myocardial injury (non-traumatic)
0 subcodes
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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