ICD-10-CM Code I20.9

Angina pectoris, unspecified

Version 2020 Billable Code Cardiology

Valid for Submission

I20.9 is a billable code used to specify a medical diagnosis of angina pectoris, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code I20.9 might also be used to specify conditions or terms like angina associated with type 2 diabetes mellitus, angina control, angina control - improving, angina control - poor, angina pectoris, angina, class iv, etc

The code is commonly used in cardiology medical specialties to specify clinical concepts such as chest pain.

Short Description:Angina pectoris, unspecified
Long Description:Angina pectoris, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code I20.9:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Angina NOS
  • Anginal syndrome
  • Cardiac angina
  • Ischemic chest pain

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code I20.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis 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
  • Recurrent angina after coronary stent placement
  • Recurrent angina after directional coronary atherectomy
  • Recurrent angina after percutaneous transluminal coronary angioplasty
  • Recurrent angina post rotational atherectomy
  • Status anginosus
  • Typical angina

Clinical Information

  • 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 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.
  • 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.

Convert I20.9 to ICD-9

  • 413.9 - Angina pectoris NEC/NOS (Approximate Flag)

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Ischemic heart diseases (I20-I25)
      • Angina pectoris (I20)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


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.

Angina is a symptom of coronary artery disease (CAD), the most common heart disease. CAD happens when a sticky substance called plaque builds up in the arteries that supply blood to the heart, reducing blood flow.

There are three types of angina:

  • Stable angina is the most common type. It happens when the heart is working harder than usual. Stable angina has a regular pattern. Rest and medicines usually help.
  • Unstable angina is the most dangerous. It does not follow a pattern and can happen without physical exertion. It does not go away with rest or medicine. It is a sign that you could have a heart attack soon.
  • Variant angina is rare. It happens when you are resting. Medicines can help.

Not all chest pain or discomfort is angina. If you have chest pain, you should see your health care provider.

NIH: National Heart, Lung, and Blood Institute

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