ICD-10 Code I24.9 – Acute ischemic heart disease, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I24.9 – Acute ischemic heart disease, unspecified
What it is
I24.9 is used for an acute ischemic heart disease diagnosis when the record does not specify a more precise type. It indicates a sudden reduction in blood flow to the heart muscle, but the exact ischemic condition is not documented.
Clinical signs
Clinical features vary; refer to documentation. Typical records may describe chest discomfort, ischemic ECG changes, or other evidence of myocardial ischemia, but you should code only what is clearly stated.
When to use this code
Use I24.9 when the provider documents acute ischemic heart disease without naming unstable angina, infarction, or another more specific diagnosis. It also fits when the note confirms acute ischemia but leaves the subtype unspecified. Check documentation if the chart suggests a more detailed code is available.
Do not use for
Do not use this code for acute myocardial infarction, unstable angina, or chronic ischemic heart disease. If the documentation identifies a specific ischemic heart condition, code that condition instead.
Coding tip
Query the provider when the chart says “ischemia” but does not clarify whether the episode is acute, chronic, or an infarction.