I25.9 – Chronic ischemic heart disease, unspecified

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

Billable code

ICD-10-CM code I25.9

Code: I25.9 (claims format: I259)
Description: Chronic ischemic heart disease, unspecified
Billable: Yes – valid for HIPAA-covered transactions
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
Parent codes: I25

Notes for I25.9

Applicable to:

Ischemic heart disease (chronic) NOS

Notes inherited from parent codes

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

I25 – Chronic ischemic heart disease

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)

Block I20-I25

Code also:

the presence of hypertension (I10-I1A)

Index terms for I25.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I25

Frequently asked questions

What is ICD-10 code I25.9?

I25.9 is the ICD-10-CM code for chronic ischemic heart disease, unspecified, in the block I20-I25 (Ischemic heart diseases).

Is I25.9 a billable code?

Yes. I25.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I25.9 belong to?

It belongs to category I25 – Chronic ischemic heart disease.

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.