2026 ICD-10-CM Diagnosis Code I25Chronic ischemic heart disease

ICD-10-CM Codes›I00–I99›I20-I25›I25

ICD-10-CM I25
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I25 is a non-billable ICD-10-CM category code for chronic ischemic heart disease, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I25.10, I25.110, I25.111, and I25.112.

Code Identity

ICD-10-CM Code
I25
Billable Status
No — Non-Billable Category
Code Describes
Chronic ischemic heart disease
Chapter
I20-I25
Ischemic heart diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI25Chronic ischemic heart disease
This CodeI25Chronic ischemic heart disease

Specific Coding for Chronic ischemic heart diseaseOverview

Non-specific codes like I25 require more characters. Use one of these billable codes instead:

  • I25.1 for Atherosclerotic heart disease of native coronary artery

  • Use I25.10 for Atherosclerotic heart disease of native coronary artery without angina pectoris

  • I25.11 for Atherosclerotic heart disease of native coronary artery with angina pectoris

  • Use I25.2 for Old myocardial infarction

  • Use I25.3 for Aneurysm of heart

  • I25.4 for Coronary artery aneurysm and dissection

  • Use I25.41 for Coronary artery aneurysm

  • Use I25.42 for Coronary artery dissection

  • Use I25.5 for Ischemic cardiomyopathy

  • Use I25.6 for Silent myocardial ischemia

  • I25.7 for Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris

  • I25.70 for Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris

  • I25.71 for Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris

  • I25.72 for Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris

  • I25.73 for Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris

  • I25.75 for Atherosclerosis of native coronary artery of transplanted heart with angina pectoris

  • I25.76 for Atherosclerosis of bypass graft of coronary artery of transplanted heart with angina pectoris

  • I25.79 for Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris

  • I25.8 for Other forms of chronic ischemic heart disease

  • I25.81 for Atherosclerosis of other coronary vessels without angina pectoris

  • Use I25.82 for Chronic total occlusion of coronary artery

  • Use I25.83 for Coronary atherosclerosis due to lipid rich plaque

  • Use I25.84 for Coronary atherosclerosis due to calcified coronary lesion

  • Use I25.85 for Chronic coronary microvascular dysfunction

  • Use I25.89 for Other forms of chronic ischemic heart disease

  • Use I25.9 for Chronic ischemic heart disease, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use 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

  • non-ischemic myocardial injury I5A

Patient EducationClinical

Atherosclerosis

Atherosclerosis is a condition in which plaque builds up inside your arteries. Plaque is a sticky substance made up of cholesterol, fat, blood cells, calcium, and other substances found in the blood. Over time, plaque hardens and causes your arteries to narrow. That limits the flow of oxygen-rich blood to your body.

The full article covers:

  • What is atherosclerosis?
  • What causes atherosclerosis?
  • Who is more likely to develop atherosclerosis?
  • What are the symptoms of atherosclerosis?
  • What other problems can atherosclerosis cause?
  • How is atherosclerosis diagnosed?
  • What are the treatments for atherosclerosis?
  • Can atherosclerosis be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I25Overview

Is I25 (Chronic ischemic heart disease) a billable code?

No. This is a category header that groups the codes for chronic ischemic heart disease, and headers cannot be submitted on claims. Claims for chronic ischemic heart disease need a more specific code from this category, such as I25.10, I25.110, and I25.111.