2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Chronic ischemic heart disease
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I25: its own notes plus those printed at block I20-I25 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On I25 itself
  • non-ischemic myocardial injury (I5A)
From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • 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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block I20-I25 Ischemic heart diseases applies to 94 codes
  • the presence of hypertension (I10-I1A)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I25, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming I25: its condition is not part of those codes, and both may be reported when the patient has both.

  • I74 Arterial embolism and thrombosis
    coronary embolism and thrombosis (I21-I25) names I21-I25, which includes this code
  • I82 Other venous embolism and thrombosis
    coronary (I21-I25) names I21-I25, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I25Overview

What is the ICD-10 code for chronic ischemic heart disease?

I25 is the ICD-10-CM category for chronic ischemic heart disease, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Does I25 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: 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 listed in the Instructional Notes section. The additional code is reported after I25.