Diseases of esophagus, stomach and duodenum (K20-K31)
K21: Gastro-esophageal reflux disease

excludes1
newborn esophageal reflux (P78.83)
K21.0: Gastro-esophageal reflux disease with esophagitis
K21.9: Gastro-esophageal reflux disease without esophagitis

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