Intermediate coronary syndrome

This code represents a form of unstable angina, characterized by chest pain that is new in onset, accelerating in frequency or severity, or occurring at rest. It signifies an intermediate stage of coronary artery disease where the patient is at high risk for myocardial infarction but has not yet experienced one. This condition indicates a critical imbalance between myocardial oxygen supply and demand.

Use this code for patients presenting with symptoms consistent with unstable angina, such as crescendo angina, new-onset severe angina, or rest angina, without evidence of myocardial necrosis (e.g., negative cardiac enzymes). Documentation should clearly state "intermediate coronary syndrome," "unstable angina," or similar terms indicating a pre-infarction state.

• Do not use this code if there is evidence of myocardial infarction (elevated cardiac enzymes).
• Distinguish carefully from stable angina (413.9) and acute myocardial infarction (410.xx).
• Ensure documentation specifies the type of unstable angina if more detail is available (e.g., new onset, rest, post-infarction).