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K21.00 — Gastro-esophageal reflux disease with esophagitis, without bleeding
K21.00
What this code means
Gastro-oesophageal reflux disease in which stomach acid has inflamed the gullet (oesophagitis), without bleeding.
Also called: gerd with esophagitis, reflux oesophagitis.
When this code is used
Used for gastro-oesophageal reflux disease with oesophagitis, without bleeding.
Where it sits in ICD-10-CM
Code K21.00 belongs to Chapter 11: Diseases of the digestive system, which covers codes K00–K95 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Frequently asked questions
What is ICD-10-CM code K21.00?
K21.00 is the ICD-10-CM diagnosis code for “Gastro-esophageal reflux disease with esophagitis, without bleeding”. Gastro-oesophageal reflux disease in which stomach acid has inflamed the gullet (oesophagitis), without bleeding.
When is code K21.00 used?
Used for gastro-oesophageal reflux disease with oesophagitis, without bleeding. It belongs to Chapter 11 of ICD-10-CM (Diseases of the digestive 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.