I25 – Chronic ischemic heart disease

ICD-10-CM 2027 diagnosis code · Ischemic heart diseases

Non-billable header

ICD-10-CM code I25

Code: I25 (claims format: I25)
Description: Chronic ischemic heart disease
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I20-I25 Ischemic heart diseases

Billable codes under I25

I25 is a header code and cannot be used on claims. Choose the most specific code:

I25.1 – Atherosclerotic heart disease of native coronary arteryHeader (more codes below)
I25.2 – Old myocardial infarctionBillable
I25.3 – Aneurysm of heartBillable
I25.4 – Coronary artery aneurysm and dissectionHeader (more codes below)
I25.5 – Ischemic cardiomyopathyBillable
I25.6 – Silent myocardial ischemiaBillable
I25.7 – Atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectorisHeader (more codes below)
I25.8 – Other forms of chronic ischemic heart diseaseHeader (more codes below)
I25.9 – Chronic ischemic heart disease, unspecifiedBillable

Notes for I25

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)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block I20-I25

Code also:

the presence of hypertension (I10-I1A)

Frequently asked questions

What is ICD-10 code I25?

I25 is the ICD-10-CM code for chronic ischemic heart disease, in the block I20-I25 (Ischemic heart diseases).

Is I25 a billable code?

No. I25 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.