2026 ICD-10-CM Diagnosis Code I20.9Angina pectoris, unspecified

ICD-10-CM Codes›I00–I99›I20-I25›I20

ICD-10-CM I20.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I20.9 is a billable ICD-10-CM diagnosis code for angina pectoris, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Coronary atherosclerosis and other heart disease.

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

Code Identity

ICD-10-CM Code
I20.9
Billable Status
Yes — Valid for Submission
Code Describes
Angina pectoris, unspecified
Short Description
Angina pectoris, unspecified
Same as the full description in the CMS dataset.
Parent Code
I20
Angina pectoris

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI20-I25Ischemic heart diseases
CategoryI20Angina pectoris
This CodeI20.9Angina pectoris, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angina associated with type 2 diabetes mellitus
  • Angina control
  • Angina control - improving
  • Angina control - poor
  • Angina pectoris
  • Angina, class IV
  • Ischemic chest pain
  • New onset angina
  • Patient post angioplasty
  • Patient post percutaneous transluminal coronary angioplasty
  • Recurrent angina after directional coronary atherectomy
  • Recurrent angina after percutaneous transluminal coronary angioplasty
  • Recurrent angina following placement of coronary artery stent
  • Recurrent angina post rotational atherectomy
  • Status anginosus
  • Typical angina

Tabular List NotesGuidance

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

Inclusion Terms

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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR011
Coronary atherosclerosis and other heart disease
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Convert I20.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
413.9 Angina pectoris NEC/NOS
Approximate The match is approximate rather than exact.

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 I20.9Overview

Is I20.9 (Angina pectoris) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report angina pectoris, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of I20.9?

Under the General Equivalence Mappings, angina pectoris, unspecified converts to ICD-9-CM 413.9 (angina pectoris NEC/NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.