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 90 Gastroduodenitis, unspecified, without bleeding
 * K29.91 Gastroduodenitis, unspecified, with bleeding

K30 Dyspepsia

 * Includes: indigestion
 * Excludes1: heartburn (R12)
 * nervous dyspepsia (F45.8)
 * neurotic dyspepsia (F45.8)
 * psychogenic dyspepsia (F45.8)

K31 Other diseases of stomach and duodenum

 * Includes: functional disorders of stomach
 * Excludes2: diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
 * diverticulum of duodenum (K57.00-K57.11)
 * K31.0 Acute dilatation of stomach
 * Acute distention of stomach
 * K31.1 Adult hypertrophic pyloric stenosis
 * Pyloric stenosis NOS
 * Excludes1: congenital or infantile pyloric stenosis (Q40.0)
 * K31.2 Hourglass stricture and stenosis of stomach
 * Excludes1: congenital hourglass stomach (Q40.2)
 * hourglass contraction of stomach (K31.89)
 * K31.3 Pylorospasm, not elsewhere classified
 * Excludes1: congenital or infantile pylorospasm (Q40.0)
 * neurotic pylorospasm (F45.8)
 * psychogenic pylorospasm (F45.8)
 * K31.4 Gastric diverticulum
 * Excludes1: congenital diverticulum of stomach (Q40.2)
 * K31.5 Obstruction of duodenum
 * Constriction of duodenum
 * Duodenal ileus (chronic)
 * Stenosis of duodenum
 * Stricture of duodenum
 * Volvulus of duodenum
 * Excludes1: congenital stenosis of duodenum (Q41.0)
 * K31.6 Fistula of stomach and duodenum
 * Gastrocolic fistula
 * Gastrojejunocolic fistula
 * K31.7 Polyp of stomach and duodenum
 * Excludes1: adenomatous polyp of stomach (D13.1)
 * K31.8 Other specified diseases of stomach and duodenum
 * K31.81 Angiodysplasia of stomach and duodenum
 * K31.811 Angiodysplasia of stomach and duodenum with bleeding
 * K31.819 Angiodysplasia of stomach and duodenum without bleeding
 * Angiodysplasia