I20.1 Angina pectoris with documented spasm

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Angiospastic angina
• Prinzmetal angina
• Spasm-induced angina
• Variant angina

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)

• 413.1 Prinzmetal angina

Code annotations containing back-references to I20.1

Back-references to I20.1

• Type 1 Excludes: I25.111 Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerotic heart disease (I20.1)")
• Type 1 Excludes: I25.701 Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerosis of coronary artery bypass graft (I20.1)")
• Type 1 Excludes: I25.711 Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerosis of autologous vein coronary artery bypass graft(s) (I20.1)")
• Type 1 Excludes: I25.721 Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerosis of autologous artery coronary artery bypass graft(s) (I20.1)")
• Type 1 Excludes: I25.731 Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerosis of nonautologous biological coronary artery bypass graft(s) (I20.1)")
• Type 1 Excludes: I25.791 Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasm ("angina pectoris with documented spasm without atherosclerosis of other coronary artery bypass graft(s) (I20.1)")

Back-references to I20

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

Diagnosis Index entries for I20.1

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) › with › documented spasm
• Ischemia, ischemic › supply (coronary) › due to vasospasm
• Prinzmetal angina
• Spasm (s), spastic, spasticity › cardiac
• Spasm (s), spastic, spasticity › coronary (artery)
• Spasm (s), spastic, spasticity › heart
• Vasospasm (vasoconstriction) › coronary

Nearby codes

• I20 Angina pectoris
• I20.0 Unstable angina
• I20.1 Angina pectoris with documented spasm (this code)
• 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