ICD-10 Code I25.9 – Chronic ischemic heart disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I25.9 – Chronic ischemic heart disease, unspecified
What it is
I25.9 identifies chronic ischemic heart disease when the record confirms long-term myocardial ischemia but does not specify a more exact type. Use it when documentation supports ischemic heart disease, yet details such as angina, prior infarction, or graft status are not provided.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a history of coronary artery disease, chronic chest discomfort, exertional dyspnea, or evidence of myocardial ischemia on prior testing.
When to use this code
Use I25.9 when the provider documents chronic ischemic heart disease and no further subclassification is available. It is appropriate for outpatient or inpatient records that confirm a chronic ischemic process but do not name angina, old myocardial infarction, or other specific ischemic conditions.
If the note only says “CAD” or “heart disease” without ischemic confirmation, check documentation before assigning this code. When a more specific I25 category is documented, code that condition instead.
Do not use for
Do not use I25.9 for acute coronary syndrome, acute myocardial infarction, or unstable angina. Also avoid it when the record identifies a more specific chronic ischemic heart disease code.
Coding tip
Review the full cardiology note for specificity; if the type of chronic ischemic heart disease is named, code that diagnosis instead of I25.9.