ICD-10 Code I25.85 – Chronic coronary microvascular dysfunction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I25.85 – Chronic coronary microvascular dysfunction
What it is
I25.85 identifies chronic coronary microvascular dysfunction, a condition where the heart’s small blood vessels do not work normally. It can reduce blood flow to the myocardium even when the major coronary arteries are not significantly blocked.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see angina-like chest discomfort, ischemic symptoms with nonobstructive coronary findings, or abnormal testing suggesting microvascular ischemia.
When to use this code
Use this code when the provider documents chronic coronary microvascular dysfunction as the diagnosis. It fits cases where symptoms or testing support microvascular ischemia rather than large-vessel coronary obstruction. Check documentation if the record only says chest pain, ischemia, or coronary disease without this specific diagnosis.
Do not use for
Do not use it for acute coronary syndromes, generic chest pain, or unspecified coronary artery disease. If the chart does not clearly identify microvascular dysfunction, check documentation before assigning I25.85.
Coding tip
Code I25.85 only when the provider explicitly links the condition to chronic coronary microvascular dysfunction.