Prinzmetal angina

This code identifies Prinzmetal angina, also known as variant angina, a rare form of angina pectoris characterized by spontaneous coronary artery spasm. These spasms transiently narrow the coronary arteries, leading to myocardial ischemia and chest pain, often occurring at rest and frequently in the early morning hours.

Apply this code when documentation explicitly states "Prinzmetal angina" or "variant angina" as the patient's diagnosis. Supporting clinical notes should describe recurrent episodes of chest pain, particularly at rest, and may mention findings consistent with coronary vasospasm, such as transient ST-segment elevation during pain.

• Differentiate from unstable angina (411.1) or other forms of angina pectoris, which are typically exertion-related.
• Ensure documentation specifies "Prinzmetal" or "variant" to avoid miscoding other angina types.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter.