Chronic ischemic heart disease (I25) ICD-10-CM
The I25 code range covers chronic ischemic heart disease with 70 ICD-10-CM diagnosis codes. 56 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code to identify:
- chronic total occlusion of coronary artery I25.82
- exposure to environmental tobacco smoke Z77.22
- history of tobacco dependence Z87.891
- occupational exposure to environmental tobacco smoke Z57.31
- tobacco dependence F17
- tobacco use Z72.0
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- non-ischemic myocardial injury I5A
Codes in the I25 Range 70 codes · 56 billable
- I25 Chronic ischemic heart diseaseNon-billable
- I25.1 Atherosclerotic heart disease of native coronary arteryNon-billable
- I25.10 Atherosclerotic heart disease of native coronary artery without angina pectoris
- I25.11 Atherosclerotic heart disease of native coronary artery with angina pectorisNon-billable
- I25.110 Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
- I25.111 Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm
- I25.112 Atherosclerotic heart disease of native coronary artery with refractory angina pectoris
- I25.118 Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris
- I25.119 Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris
- I25.2 Old myocardial infarction
- I25.3 Aneurysm of heart
- I25.4 Coronary artery aneurysm and dissectionNon-billable
- I25.41 Coronary artery aneurysm
- I25.42 Coronary artery dissection
- I25.5 Ischemic cardiomyopathy
- I25.6 Silent myocardial ischemia
- I25.7 Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectorisNon-billable
- I25.70 Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectorisNon-billable
- I25.700 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris
- I25.701 Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm
- I25.702 Atherosclerosis of coronary artery bypass graft(s), unspecified, with refractory angina pectoris
- I25.708 Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectoris
- I25.709 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris
- I25.71 Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectorisNon-billable
- I25.710 Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris
- I25.711 Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.712 Atherosclerosis of autologous vein coronary artery bypass graft(s) with refractory angina pectoris
- I25.718 Atherosclerosis of autologous vein coronary artery bypass graft(s) with other forms of angina pectoris
- I25.719 Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris
- I25.72 Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectorisNon-billable
- I25.720 Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris
- I25.721 Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.722 Atherosclerosis of autologous artery coronary artery bypass graft(s) with refractory angina pectoris
- I25.728 Atherosclerosis of autologous artery coronary artery bypass graft(s) with other forms of angina pectoris
- I25.729 Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectoris
- I25.73 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectorisNon-billable
- I25.730 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectoris
- I25.731 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.732 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with refractory angina pectoris
- I25.738 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with other forms of angina pectoris
- I25.739 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectoris
- I25.75 Atherosclerosis of native coronary artery of transplanted heart with angina pectorisNon-billable
- I25.750 Atherosclerosis of native coronary artery of transplanted heart with unstable angina
- I25.751 Atherosclerosis of native coronary artery of transplanted heart with angina pectoris with documented spasm
- I25.752 Atherosclerosis of native coronary artery of transplanted heart with refractory angina pectoris
- I25.758 Atherosclerosis of native coronary artery of transplanted heart with other forms of angina pectoris
- I25.759 Atherosclerosis of native coronary artery of transplanted heart with unspecified angina pectoris
- I25.76 Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectorisNon-billable
- I25.760 Atherosclerosis of bypass graft of coronary artery of transplanted heart with unstable angina
- I25.761 Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris with documented spasm
- I25.762 Atherosclerosis of bypass graft of coronary artery of transplanted heart with refractory angina pectoris
- I25.768 Atherosclerosis of bypass graft of coronary artery of transplanted heart with other forms of angina pectoris
- I25.769 Atherosclerosis of bypass graft of coronary artery of transplanted heart with unspecified angina pectoris
- I25.79 Atherosclerosis of other coronary artery bypass graft(s) with angina pectorisNon-billable
- I25.790 Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectoris
- I25.791 Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasm
- I25.792 Atherosclerosis of other coronary artery bypass graft(s) with refractory angina pectoris
- I25.798 Atherosclerosis of other coronary artery bypass graft(s) with other forms of angina pectoris
- I25.799 Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris
- I25.8 Other forms of chronic ischemic heart diseaseNon-billable
- I25.81 Atherosclerosis of other coronary vessels without angina pectorisNon-billable
- I25.810 Atherosclerosis of coronary artery bypass graft(s) without angina pectoris
- I25.811 Atherosclerosis of native coronary artery of transplanted heart without angina pectoris
- I25.812 Atherosclerosis of bypass graft of coronary artery of transplanted heart without angina pectoris
- I25.82 Chronic total occlusion of coronary artery
- I25.83 Coronary atherosclerosis due to lipid rich plaque
- I25.84 Coronary atherosclerosis due to calcified coronary lesion
- I25.85 Chronic coronary microvascular dysfunction
- I25.89 Other forms of chronic ischemic heart disease
- I25.9 Chronic ischemic heart disease, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I25 range.
Myocardial Ischemia
A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (CORONARY ARTERY DISEASE), to obstruction by a thrombus (CORONARY THROMBOSIS), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (MYOCARDIAL INFARCTION).
About the I25 Code Range
Chronic ischemic heart disease (ICD-10 code I25) encompasses a group of conditions characterized by long-term reduced blood flow to the heart muscle, often due to narrowed or blocked coronary arteries. These codes specify different types and complications of coronary artery disease, including stable and unstable forms, past heart attacks, and complications involving bypass grafts.
The ICD-10 codes in the I25 section are used to classify atherosclerotic heart disease and related chronic conditions. For example, I25.10 refers to coronary atherosclerosis without angina pectoris, also known as coronary arteriosclerosis or non-anginal coronary artery disease, while I25.11 includes cases with angina pectoris, such as stable or unstable angina (sometimes called preinfarction syndrome). I25.2 covers old myocardial infarction, indicating a past heart attack confirmed by ECG or other tests. Specific codes like I25.41 and I25.42 identify coronary artery aneurysm and dissection. Other codes, such as I25.5, indicate ischemic cardiomyopathy, a form of heart failure caused by poor coronary blood flow. The codes also differentiate disease in native arteries from that in coronary artery bypass grafts or transplanted hearts, accounting for varying presentations of angina or ischemia. This classification helps healthcare professionals precisely document the type and severity of chronic ischemic heart diseases for effective diagnosis and management.
Questions About This Page
How many billable codes are in the I25 range?
Of the 70 codes in this range, 56 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I25 range classify?
The range classifies chronic ischemic heart disease. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
