2027 ICD-10-CM Diagnosis Code I20Angina pectoris

ICD-10-CM Codes›I00–I99›I20-I25›I20

ICD-10-CM I20
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Angina pectoris
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I20: its own notes plus those printed at block I20-I25 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • 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)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • 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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block I20-I25 Ischemic heart diseases applies to 94 codes
  • the presence of hypertension (I10-I1A)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I20, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming I20: they are not reported together with it, unless the two conditions are unrelated.

  • I24 Other acute ischemic heart diseases
    angina pectoris (I20.-)

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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I20Overview

What is the ICD-10 code for angina pectoris?

I20 is the ICD-10-CM category for angina pectoris, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can I20 be reported with a code from I25.1?

Not as a rule. The Excludes1 note on I20 lists "angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does I20 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: 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). The additional code is reported after I20.