2026 ICD-10-CM Diagnosis Code I20Angina pectoris

ICD-10-CM Codes›I00–I99›I20-I25›I20

ICD-10-CM I20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I20 is a non-billable ICD-10-CM category code for angina pectoris, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I20.0, I20.1, I20.2, and I20.81.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such chest pain.

Code Identity

ICD-10-CM Code
I20
Billable Status
No — Non-Billable Category
Code Describes
Angina pectoris
Chapter
I20-I25
Ischemic heart diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI20Angina pectoris
This CodeI20Angina pectoris

Specific Coding for Angina pectorisOverview

Non-specific codes like I20 require more characters. Use one of these billable codes instead:

  • Use I20.0 for Unstable angina

  • Use I20.1 for Angina pectoris with documented spasm

  • Use I20.2 for Refractory angina pectoris

  • I20.8 for Other forms of angina pectoris

  • Use I20.81 for Angina pectoris with coronary microvascular dysfunction

  • Use I20.89 for Other forms of angina pectoris

  • Use I20.9 for Angina pectoris, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

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

Type 1 Excludes

  • angina pectoris with atherosclerotic heart disease of native coronary arteries I25.1
  • atherosclerosis of coronary artery bypass grafts and coronary artery of transplanted heart with angina pectoris I25.7
  • postinfarction angina I23.7

Clinical InformationClinical

  • Angina Pectoris

    the symptom of paroxysmal pain consequent to myocardial ischemia usually of distinctive character, location and radiation. it is thought to be provoked by a transient stressful situation during which the oxygen requirements of the myocardium exceed that supplied by the coronary circulation.

  • Angina Pectoris, Variant

    a clinical syndrome characterized by the development of chest pain at rest with concomitant transient st segment elevation in the electrocardiogram, but with preserved exercise capacity.

  • Angina, Stable

    persistent and reproducible chest discomfort usually precipitated by a physical exertion that dissipates upon cessation of such an activity. the symptoms are manifestations of myocardial ischemia.

  • Angina, Unstable

    precordial pain at rest, which may precede a myocardial infarction.

  • Microvascular Angina

    angina pectoris or angina-like chest pain with a normal coronary arteriogram and positive exercise test. the cause of the syndrome is unknown. while its recognition is of clinical importance, its prognosis is excellent. (braunwald, heart disease, 4th ed, p1346; jablonski dictionary of syndromes & eponymic diseases, 2d ed). it is different from metabolic syndrome x, a syndrome characterized by insulin resistance and hyperinsulinemia, that has increased risk for cardiovascular disease.

  • Myocardial Ischemia

    a disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. the decreased blood flow may be due to narrowing of the coronary arteries (coronary artery disease), to obstruction by a thrombus (coronary thrombosis), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (myocardial infarction).

  • Myocardial Infarction

    necrosis of the myocardium caused by an obstruction of the blood supply to the heart (coronary circulation).

Patient EducationClinical

Angina

Angina is chest pain or discomfort you feel when there is not enough blood flow to your heart muscle. Your heart muscle needs the oxygen that the blood carries. Angina may feel like pressure or a squeezing pain in your chest. It may feel like indigestion. You may also feel pain in your shoulders, arms, neck, jaw, or back.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I20Overview

Is I20 (Angina pectoris) a billable code?

No. This is a category header that groups the codes for angina pectoris, and headers cannot be submitted on claims. Claims for angina pectoris need a more specific code from this category, such as I20.0, I20.1, and I20.2.