Acute coronary microvascular dysfunction

This code represents a condition where the small blood vessels of the heart (microvasculature) are acutely dysfunctional, leading to symptoms of myocardial ischemia without significant blockages in the larger coronary arteries. It signifies a sudden onset of impaired microvascular blood flow, affecting the heart muscle's oxygen supply.

Use this code for patients presenting with acute chest pain or other signs of myocardial ischemia where diagnostic testing, such as coronary angiography, reveals no obstructive epicardial coronary artery disease but evidence of microvascular dysfunction. Documentation should clearly indicate acute onset and findings consistent with microvascular involvement.

• Differentiate from chronic microvascular dysfunction (I24.89) based on the acute nature of the presentation.
• Ensure documentation explicitly states "acute" and "microvascular dysfunction" to support this specific code.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, especially in cases of MINOCA (Myocardial Infarction with Non-Obstructive Coronary Arteries) attributed to microvascular causes.