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Includes: functional disorders of stomach
Excludes: diverticulum of duodenum (K57.0-K57.1)
gastrointestinal haemorrhage (K92.0-K92.2)

K31.0
Acute dilatation of stomach
Acute distension of stomach

K31.1
Adult hypertrophic pyloric stenosis
Pyloric stenosis NOS
Excludes: congenital or infantile pyloric stenosis (Q40.0)

K31.2
Hourglass stricture or stenosis of stomach
Excludes: congenital hourglass stomach (Q40.2)
hourglass contraction of stomach (K31.8)

K31.3
Pylorospasm, not elsewhere classified
Excludes: pylorospasm:
. congenital or infantile (Q40.0)
. neurotic (F45.3)
. psychogenic (F45.3)

K31.4
Gastric diverticulum
Excludes: congenital diverticulum of stomach (Q40.2)

K31.5
Obstruction of duodenum
Constriction of duodenum 
Stenosis of duodenum
Stricture of duodenum 
Duodenal ileus (chronic)
Excludes: congenital stenosis of duodenum (Q41.0)

K31.6
Fistula of stomach and duodenum
Gastrocolic fistula
Gastrojejunocolic fistula

K31.8
Other specified diseases of stomach and duodenum
Achlorhydria
Gastroptosis
Hourglass contraction of stomach

K31.9
Disease of stomach and duodenum, unspecified



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