Chapter 9. Diseases of the Circulatory System (I00-I99) ICD-9 (1 code) 413.9 Angina pectoris NEC/NOS ICD-10 (26 codes) I20 . 8 Other forms of angina pectoris I20 . 9 Angina pectoris, unspecified I25 . 111 Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm I25 . 118 Atherosclerotic heart disease of native coronary artery with other forms of angina pectoris I25 . 119 Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris I25. 701 Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm I25. 708 Atherosclerosis of coronary artery bypass graft(s), unspecified, with other forms of angina pectoris I25. 709 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified...