2006 ICD-9-CM Volume 1 Diagnosis Codes > Diseases Of The Digestive System 520-579 > Diseases Of Esophagus, Stomach, And Duodenum 530-537 > 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