• 530 Diseases of esophagus
  • 531 Gastric ulcer
  • 532 Duodenal ulcer
  • 533 Peptic ulcer site unspecified
  • 534 Gastrojejunal ulcer
  • 535 Gastritis and duodenitis
  • 536 Disorders of function of stomach
  • 537 Other disorders of stomach and duodenum
  • 538 Gastrointestinal mucositis (ulcerative)