ICD-10 diagnosis code

K21 Gastro-oesophageal reflux disease

K21 is the ICD-10 code for Gastro-oesophageal reflux disease. It is a three-character category divided into 2 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block K20–K31 (Diseases of oesophagus, stomach and duodenum) in Chapter XI, Diseases of the digestive system.

Code type: Category (3 characters)
Chapter: XI · K00–K93
Classification: WHO ICD-10, 2019 version

Subcodes of K21

K21 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

K21Gastroesofageal refluxsjukdom (återflöde av maginnehåll till matstrupen)

DenmarkICD-10-DK

DK21Gastro-øsofagal refluks

FinlandICD-10-FI

K21Ruokatorven refluksisairaus

GermanyICD-10-GM

K21Gastroösophageale Refluxkrankheit

FranceICD-10-FR

K21Reflux gastro-œsophagien

NetherlandsICD-10-NL

K21aandoeningen door gastro-oesofagale reflux

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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