Angina pectoris - I20
Use Additional Code: This note indicates that an additional code should be used in conjunction with the primary code "I20" to provide a complete picture of the patient's condition or to capture associated factors.
Use 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.-)
- tobacco use (Z72.0)
Excludes1: It indicates that the conditions described by two codes cannot occur together in the same patient. These codes are mutually exclusive.
Type 1 Excludes:
- 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-)
- postinfarction angina (I23.7)
These ranges represents subcategories of Angina pectoris. The "I20" signifies that these are the diseases within this broad category.