ICD-10-CM Section · I20-I25
Ischemic heart diseases
119 codes in this section
119
Total Codes
94
Billable
25
Header (Non-Billable)
6
Top-Level Codes
About Section I20-I25
Section I20-I25 (I20-I25) covers ischemic heart diseases. It sits within the Diseases of the circulatory system chapter (I00-I99). This section contains 119 ICD-10-CM codes, 94 billable diagnoses you can submit on a claim, and 25 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 I20-I25
Grouped by 3-character root code. Click any code for full detail.
I20
Angina pectoris
7 subcodes
| I20.0 | Unstable angina | Billable |
| I20.1 | Angina pectoris with documented spasm | Billable |
| I20.2 | Refractory angina pectoris | Billable |
| I20.8 | Other forms of angina pectoris | Header |
| I20.81 | Angina pectoris with coronary microvascular dysfunction | Billable |
| I20.89 | Other forms of angina pectoris | Billable |
| I20.9 | Angina pectoris, unspecified | Billable |
I21
Acute myocardial infarction
17 subcodes
| I21.0 | ST elevation (STEMI) myocardial infarction of anterior wall | Header |
| I21.01 | ST elevation (STEMI) myocardial infarction involving left main coronary artery | Billable |
| I21.02 | ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery | Billable |
| I21.09 | ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall | Billable |
| I21.1 | ST elevation (STEMI) myocardial infarction of inferior wall | Header |
| I21.11 | ST elevation (STEMI) myocardial infarction involving right coronary artery | Billable |
| I21.19 | ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall | Billable |
| I21.2 | ST elevation (STEMI) myocardial infarction of other sites | Header |
| I21.21 | ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery | Billable |
| I21.29 | ST elevation (STEMI) myocardial infarction involving other sites | Billable |
| I21.3 | ST elevation (STEMI) myocardial infarction of unspecified site | Billable |
| I21.4 | Non-ST elevation (NSTEMI) myocardial infarction | Billable |
| I21.9 | Acute myocardial infarction, unspecified | Billable |
| I21.A | Other type of myocardial infarction | Header |
| I21.A1 | Myocardial infarction type 2 | Billable |
| I21.A9 | Other myocardial infarction type | Billable |
| I21.B | Myocardial infarction with coronary microvascular dysfunction | Billable |
I22
Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
5 subcodes
| I22.0 | Subsequent ST elevation (STEMI) myocardial infarction of anterior wall | Billable |
| I22.1 | Subsequent ST elevation (STEMI) myocardial infarction of inferior wall | Billable |
| I22.2 | Subsequent non-ST elevation (NSTEMI) myocardial infarction | Billable |
| I22.8 | Subsequent ST elevation (STEMI) myocardial infarction of other sites | Billable |
| I22.9 | Subsequent ST elevation (STEMI) myocardial infarction of unspecified site | Billable |
I23
Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
9 subcodes
| I23.0 | Hemopericardium as current complication following acute myocardial infarction | Billable |
| I23.1 | Atrial septal defect as current complication following acute myocardial infarction | Billable |
| I23.2 | Ventricular septal defect as current complication following acute myocardial infarction | Billable |
| I23.3 | Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction | Billable |
| I23.4 | Rupture of chordae tendineae as current complication following acute myocardial infarction | Billable |
| I23.5 | Rupture of papillary muscle as current complication following acute myocardial infarction | Billable |
| I23.6 | Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction | Billable |
| I23.7 | Postinfarction angina | Billable |
| I23.8 | Other current complications following acute myocardial infarction | Billable |
I24
Other acute ischemic heart diseases
6 subcodes
| I24.0 | Acute coronary thrombosis not resulting in myocardial infarction | Billable |
| I24.1 | Dressler's syndrome | Billable |
| I24.8 | Other forms of acute ischemic heart disease | Header |
| I24.81 | Acute coronary microvascular dysfunction | Billable |
| I24.89 | Other forms of acute ischemic heart disease | Billable |
| I24.9 | Acute ischemic heart disease, unspecified | Billable |
I25
Chronic ischemic heart disease
69 subcodes
| I25.1 | Atherosclerotic heart disease of native coronary artery | Header |
| I25.10 | Atherosclerotic heart disease of native coronary artery without angina pectoris | Billable |
| I25.11 | Atherosclerotic heart disease of native coronary artery with angina pectoris | Header |
| I25.110 | Atherosclerotic heart disease of native coronary artery with unstable angina pectoris | Billable |
| I25.111 | Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm | Billable |
| I25.112 | Atherosclerotic heart disease of native coronary artery with refractory angina pectoris | Billable |
| I25.118 | Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris | Billable |
| I25.119 | Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris | Billable |
| I25.2 | Old myocardial infarction | Billable |
| I25.3 | Aneurysm of heart | Billable |
| I25.4 | Coronary artery aneurysm and dissection | Header |
| I25.41 | Coronary artery aneurysm | Billable |
| I25.42 | Coronary artery dissection | Billable |
| I25.5 | Ischemic cardiomyopathy | Billable |
| I25.6 | Silent myocardial ischemia | Billable |
| I25.7 | Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris | Header |
| I25.70 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris | Header |
| I25.700 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris | Billable |
| I25.701 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm | Billable |
| I25.702 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with refractory angina pectoris | Billable |
| I25.708 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectoris | Billable |
| I25.709 | Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris | Billable |
| I25.71 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris | Header |
| I25.710 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris | Billable |
| I25.711 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm | Billable |
| I25.712 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with refractory angina pectoris | Billable |
| I25.718 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with other forms of angina pectoris | Billable |
| I25.719 | Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris | Billable |
| I25.72 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris | Header |
| I25.720 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris | Billable |
| I25.721 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm | Billable |
| I25.722 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with refractory angina pectoris | Billable |
| I25.728 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with other forms of angina pectoris | Billable |
| I25.729 | Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectoris | Billable |
| I25.73 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris | Header |
| I25.730 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectoris | Billable |
| I25.731 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasm | Billable |
| I25.732 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with refractory angina pectoris | Billable |
| I25.738 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with other forms of angina pectoris | Billable |
| I25.739 | Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectoris | Billable |
| I25.75 | Atherosclerosis of native coronary artery of transplanted heart with angina pectoris | Header |
| I25.750 | Atherosclerosis of native coronary artery of transplanted heart with unstable angina | Billable |
| I25.751 | Atherosclerosis of native coronary artery of transplanted heart with angina pectoris with documented spasm | Billable |
| I25.752 | Atherosclerosis of native coronary artery of transplanted heart with refractory angina pectoris | Billable |
| I25.758 | Atherosclerosis of native coronary artery of transplanted heart with other forms of angina pectoris | Billable |
| I25.759 | Atherosclerosis of native coronary artery of transplanted heart with unspecified angina pectoris | Billable |
| I25.76 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris | Header |
| I25.760 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with unstable angina | Billable |
| I25.761 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris with documented spasm | Billable |
| I25.762 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with refractory angina pectoris | Billable |
| I25.768 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with other forms of angina pectoris | Billable |
| I25.769 | Atherosclerosis of bypass graft of coronary artery of transplanted heart with unspecified angina pectoris | Billable |
| I25.79 | Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris | Header |
| I25.790 | Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectoris | Billable |
| I25.791 | Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasm | Billable |
| I25.792 | Atherosclerosis of other coronary artery bypass graft(s) with refractory angina pectoris | Billable |
| I25.798 | Atherosclerosis of other coronary artery bypass graft(s) with other forms of angina pectoris | Billable |
| I25.799 | Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris | Billable |
| I25.8 | Other forms of chronic ischemic heart disease | Header |
| I25.81 | Atherosclerosis of other coronary vessels without angina pectoris | Header |
| I25.810 | Atherosclerosis of coronary artery bypass graft(s) without angina pectoris | Billable |
| I25.811 | Atherosclerosis of native coronary artery of transplanted heart without angina pectoris | Billable |
| I25.812 | Atherosclerosis of bypass graft of coronary artery of transplanted heart without angina pectoris | Billable |
| I25.82 | Chronic total occlusion of coronary artery | Billable |
| I25.83 | Coronary atherosclerosis due to lipid rich plaque | Billable |
| I25.84 | Coronary atherosclerosis due to calcified coronary lesion | Billable |
| I25.85 | Chronic coronary microvascular dysfunction | Billable |
| I25.89 | Other forms of chronic ischemic heart disease | Billable |
| I25.9 | Chronic ischemic heart disease, unspecified | Billable |
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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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