R12 — Heartburn

R12

ICD-10 Chapter 18: Symptoms, Signs & Abnormal Findings — illustrative image — Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99) — illustrative image

What this code means

Heartburn is a burning feeling rising in the chest from acid reflux into the gullet.

Also called: heartburn, pyrosis.

When this code is used

Used for heartburn.

Where it sits in ICD-10-CM

Code R12 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Heartburn

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Frequently asked questions

What is ICD-10-CM code R12?

R12 is the ICD-10-CM diagnosis code for “Heartburn”. Heartburn is a burning feeling rising in the chest from acid reflux into the gullet.

When is code R12 used?

Used for heartburn. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).

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.