K31 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other diseases of stomach and duodenum.
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Functional disorders of stomach
Acute dilatation of stomach
Adult hypertrophic pyloric stenosis
Hourglass stricture and stenosis of stomach
Pylorospasm, not elsewhere classified
Gastric diverticulum
Obstruction of duodenum
Fistula of stomach and duodenum
Polyp of stomach and duodenum
Other specified diseases of stomach and duodenum
Disease of stomach and duodenum, unspecified
Gastric intestinal metaplasia
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