I20.9 — Angina pectoris, unspecified

I20.9

ICD-10 Chapter 9: Circulatory System — illustrative image — Chapter 9: Diseases of the circulatory system (I00–I99) — illustrative image

What this code means

Angina pectoris is chest pain or tightness caused by reduced blood flow to the heart muscle, usually with exertion.

Also called: angina, angina pectoris.

When this code is used

Used for angina pectoris when the type is not specified.

Where it sits in ICD-10-CM

Code I20.9 belongs to Chapter 9: Diseases of the circulatory system, which covers codes I00–I99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Chest pain

Related anatomy

Heart

Watch: related videos

▶ WatchAngina ▶ WatchChronic angina ▶ WatchPrinzmetal s variant angina

Frequently asked questions

What is ICD-10-CM code I20.9?

I20.9 is the ICD-10-CM diagnosis code for “Angina pectoris, unspecified”. Angina pectoris is chest pain or tightness caused by reduced blood flow to the heart muscle, usually with exertion.

When is code I20.9 used?

Used for angina pectoris when the type is not specified. It belongs to Chapter 9 of ICD-10-CM (Diseases of the circulatory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.