ICD-10-CM 2027 diagnosis code
I25Chronic ischemic heart disease
Not billable — use a more specific code
I25 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I25
I25 is the ICD-10-CM diagnosis code for chronic ischemic heart disease. It belongs to block I20-I25 (ischemic heart diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: I25.1 (artery), I25.2 (infarction), I25.3 (heart), I25.4 (dissection), I25.5 (cardiomyopathy), I25.6 (ischemia), I25.7 (pectoris), I25.8 (disease) and 1 more.
The conditions in its Excludes2 note aren't part of I25, but may be coded alongside it if the patient has both: non-ischemic myocardial injury (I5A).
Use an additional 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.-) and 1 more.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under I25
- I25.1Atherosclerotic heart disease of native coronary artery
- I25.10Atherosclerotic heart disease of native coronary artery without angina pectorisBillable
- I25.11Atherosclerotic heart disease of native coronary artery with angina pectoris
- I25.110Atherosclerotic heart disease of native coronary artery with unstable angina pectorisBillable
- I25.111Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasmBillable
- I25.112Atherosclerotic heart disease of native coronary artery with refractory angina pectorisBillable
- I25.118Atherosclerotic heart disease of native coronary artery with other forms of angina pectorisBillable
- I25.119Atherosclerotic heart disease of native coronary artery with unspecified angina pectorisBillable
- I25.2Old myocardial infarctionBillable
- I25.3Aneurysm of heartBillable
- I25.4Coronary artery aneurysm and dissection
- I25.5Ischemic cardiomyopathyBillable
- I25.6Silent myocardial ischemiaBillable
- I25.7Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris
- I25.70Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris
- I25.700Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectorisBillable
- I25.701Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasmBillable
- I25.702Atherosclerosis of coronary artery bypass graft(s), unspecified, with refractory angina pectorisBillable
- I25.708Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectorisBillable
- I25.709Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectorisBillable
- I25.71Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris
- I25.710Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectorisBillable
- I25.711Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasmBillable
- I25.712Atherosclerosis of autologous vein coronary artery bypass graft(s) with refractory angina pectorisBillable
- I25.718Atherosclerosis of autologous vein coronary artery bypass graft(s) with other forms of angina pectorisBillable
- I25.719Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectorisBillable
- I25.72Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris
- I25.720Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectorisBillable
- I25.721Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasmBillable
- I25.722Atherosclerosis of autologous artery coronary artery bypass graft(s) with refractory angina pectorisBillable
- I25.728Atherosclerosis of autologous artery coronary artery bypass graft(s) with other forms of angina pectorisBillable
- I25.729Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectorisBillable
- I25.73Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris
- I25.730Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectorisBillable
- I25.731Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasmBillable
- I25.732Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with refractory angina pectorisBillable
- I25.738Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with other forms of angina pectorisBillable
- I25.739Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectorisBillable
- I25.75Atherosclerosis of native coronary artery of transplanted heart with angina pectoris
- I25.750Atherosclerosis of native coronary artery of transplanted heart with unstable anginaBillable
- I25.751Atherosclerosis of native coronary artery of transplanted heart with angina pectoris with documented spasmBillable
- I25.752Atherosclerosis of native coronary artery of transplanted heart with refractory angina pectorisBillable
- I25.758Atherosclerosis of native coronary artery of transplanted heart with other forms of angina pectorisBillable
- I25.759Atherosclerosis of native coronary artery of transplanted heart with unspecified angina pectorisBillable
- I25.76Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris
- I25.760Atherosclerosis of bypass graft of coronary artery of transplanted heart with unstable anginaBillable
- I25.761Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris with documented spasmBillable
- I25.762Atherosclerosis of bypass graft of coronary artery of transplanted heart with refractory angina pectorisBillable
- I25.768Atherosclerosis of bypass graft of coronary artery of transplanted heart with other forms of angina pectorisBillable
- I25.769Atherosclerosis of bypass graft of coronary artery of transplanted heart with unspecified angina pectorisBillable
- I25.79Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris
- I25.790Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectorisBillable
- I25.791Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasmBillable
- I25.792Atherosclerosis of other coronary artery bypass graft(s) with refractory angina pectorisBillable
- I25.798Atherosclerosis of other coronary artery bypass graft(s) with other forms of angina pectorisBillable
- I25.799Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectorisBillable
- I25.70Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris
- I25.8Other forms of chronic ischemic heart disease
- I25.81Atherosclerosis of other coronary vessels without angina pectoris
- I25.810Atherosclerosis of coronary artery bypass graft(s) without angina pectorisBillable
- I25.811Atherosclerosis of native coronary artery of transplanted heart without angina pectorisBillable
- I25.812Atherosclerosis of bypass graft of coronary artery of transplanted heart without angina pectorisBillable
- I25.82Chronic total occlusion of coronary arteryBillable
- I25.83Coronary atherosclerosis due to lipid rich plaqueBillable
- I25.84Coronary atherosclerosis due to calcified coronary lesionBillable
- I25.85Chronic coronary microvascular dysfunctionBillable
- I25.89Other forms of chronic ischemic heart diseaseBillable
- I25.81Atherosclerosis of other coronary vessels without angina pectoris
- I25.9Chronic ischemic heart disease, unspecifiedBillable
Coding notes
Excludes2Not included here — may be reported together if both conditions exist
- non-ischemic myocardial injury (I5A)
Use additional codeAdd a secondary code to fully describe the condition
Notes that apply from higher levels
Instructions written at a parent level also apply to I25.
Broader instructions also apply from I20-I25 Ischemic heart diseases and Chapter 9: Diseases of the circulatory system.
Codes whose notes reference I25
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about I25
Is I25 billable?
- No. I25 is a header code. Report one of its more specific subcodes instead.