ICD-10 Code I24.89 – Other forms of acute ischemic heart disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I24.89 – Other forms of acute ischemic heart disease
What it is
This code identifies an acute ischemic heart condition that does not fit a more specific ICD-10 category. It usually reflects reduced blood flow to the heart muscle with an acute presentation.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include chest discomfort, ischemic ECG changes, or other evidence of acute myocardial ischemia without a more specific diagnosis.
When to use this code
Use I24.89 when the clinician documents an acute ischemic heart disease process and no more specific code applies. It is appropriate when the record supports ischemia, but the exact subtype is not named. Check documentation if the note suggests acute coronary syndrome, infarction, or another defined condition.
Do not use for
Do not use this code for acute myocardial infarction, unstable angina, or chronic ischemic heart disease when a more specific code is documented. If the diagnosis is unclear, check documentation.
Coding tip
Code the most specific ischemic heart diagnosis documented, and query when the record only says “chest pain” or “ischemia” without a clear acute heart disease diagnosis.