ICD-10 Code I25.42 – Coronary artery dissection (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I25.42 – Coronary artery dissection
What it is
I25.42 identifies a dissection involving a coronary artery, meaning a tear within the artery wall that can disrupt blood flow to the heart muscle. Use it when the record clearly documents coronary artery dissection.
Clinical signs
Clinical features vary; refer to documentation. Findings may include chest pain, acute coronary syndrome, ischemic ECG changes, or angiographic evidence of a coronary artery wall tear.
When to use this code
Use this code when the provider documents coronary artery dissection as the diagnosis or a confirmed imaging/catheterization finding. It may appear in spontaneous or procedure-related cases if the record names the dissection specifically.
If the chart only mentions chest pain, myocardial infarction, or coronary artery disease without dissection, do not assign I25.42. Check documentation for the exact vessel and whether the dissection is current or historical.
Do not use for
Do not use this code for generic coronary artery disease, coronary spasm, or myocardial infarction without documented dissection. If the diagnosis is uncertain, check documentation.
Coding tip
Confirm that the dissection is explicitly documented by the treating clinician or supported by the final diagnostic report before coding I25.42.