I20.9 Angina pectoris, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Angina NOS
• Anginal syndrome
• Cardiac angina
• Ischemic chest pain

Applies from I20 Angina pectoris

Excludes1 (never code together)

• 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)

Use additional code

• 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)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 88 — Angina Pectoris
• RxHCC V08: HCC 188 — Coronary Artery Disease
• ESRD V24: HCC 88

MS-DRG index

Defines the logic of DRG(s) 311 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 413.9 Other and unspecified angina pectoris (approximate)

Code annotations containing back-references to I20.9

Back-references to I20.9

• Type 1 Excludes: I25.119 Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris ("unspecified angina pectoris without atherosclerotic heart disease (I20.9)")
• Type 1 Excludes: I25.709 Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris ("unspecified angina pectoris without atherosclerosis of coronary artery bypass graft (I20.9)")
• Type 1 Excludes: I25.719 Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris ("unspecified angina pectoris without atherosclerosis of autologous vein coronary artery bypass graft(s) (I20.9)")
• Type 1 Excludes: I25.729 Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectoris ("unspecified angina pectoris without atherosclerosis of autologous artery coronary artery bypass graft(s) (I20.9)")
• Type 1 Excludes: I25.739 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectoris ("unspecified angina pectoris without atherosclerosis of nonautologous biological coronary artery bypass graft(s) (I20.9)")
• Type 1 Excludes: I25.799 Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris ("unspecified angina pectoris without atherosclerosis of other coronary artery bypass graft(s) (I20.9)")

Back-references to I20

• Type 1 Excludes: I24 Other acute ischemic heart diseases ("angina pectoris (I20.-)")

Diagnosis Index entries for I20.9

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
• Pain (s) › chest (central) › ischemic
• Status (post) › anginosus
• Syndrome › X

Nearby codes

• I20.1 Angina pectoris with documented spasm
• I20.2 Refractory angina pectoris
• I20.8 Other forms of angina pectoris
• I20.81 Angina pectoris with coronary microvascular dysfunction
• I20.89 Other forms of angina pectoris
• I20.9 Angina pectoris, unspecified (this code)