I20Angina pectoris

I20 is the ICD-10-CM diagnosis code for angina pectoris. It belongs to block I20-I25 (ischemic heart diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I20.0 (angina), I20.1 (with documented spasm), I20.2 (pectoris), I20.8 (pectoris) and I20.9 (unspecified).

Don't report I20 together with the conditions in its Excludes1 note: angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-), atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-) and postinfarction angina (I23.7).

Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and tobacco use (Z72.0).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.