I25

Non-Billable

ChapterI00–I99

Rankcategory

Official Description

Chronic ischemic heart disease

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here)

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.-)

I20-I25 Parent Instructions

Code Also

the presence of hypertension (I10-I1A)

Instructional Notes

Excludes2(Not included here)

non-ischemic myocardial injury (I5A)

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)

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)

I20-I25Ischemic heart diseases (I20-I25)

I25Chronic ischemic heart disease

I25.1Atherosclerotic heart disease of native coronary artery

I25.2Old myocardial infarction

I25.3Aneurysm of heart

I25.4Coronary artery aneurysm and dissection

I25.5Ischemic cardiomyopathy

I25.6Silent myocardial ischemia

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

I25.8Other forms of chronic ischemic heart disease

I25.9Chronic ischemic heart disease, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I25:

blockI20-I25

Ischemic heart diseases (I20-I25)

View context instructions

chapterCH9

Diseases of the circulatory system (I00-I99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I25. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths

Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)5 unique routes

arteriovenous (congenital)

acquired

coronary→I25

cardiac (false)→I25

coronary (arteriosclerotic) (artery)→I25(2 variants)

vein→I25

heart (wall) (chronic or with a stated duration of over 4 weeks)→I25

Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification)20 unique routes

coronary (artery)→I25(20 variants)

bypass graft→I25(19 variants)