Other forms of angina pectoris

This code represents various atypical presentations of angina pectoris that do not fit into more specific categories like unstable angina, stable angina, or vasospastic angina. It encompasses anginal symptoms attributable to coronary artery disease (CAD) but lacking the classic features or clear triggers of other defined types.

Use this code when documentation specifies angina pectoris that is not clearly stable, unstable, or vasospastic, but is still attributed to myocardial ischemia. Examples include microvascular angina, Syndrome X, or other forms of angina where the underlying mechanism is not fully elucidated but is distinct from typical presentations. Documentation should clearly state "other forms of angina" or specify a less common type of angina.

• Do not use this code for typical stable or unstable angina; use the more specific codes in the I20 series.
• Ensure the physician documentation explicitly supports a diagnosis of "other forms of angina pectoris" or a specific atypical type.
• Always sequence this code after any underlying cause of the angina, such as coronary artery disease (I25.10-I25.799), if known and documented.