• 520-529
  DISEASES OF ORAL CAVITY, SALIVARY GLANDS, AND JAWS
• 530-538
  DISEASES OF ESOPHAGUS, STOMACH, AND DUODENUM
• 540-543
  APPENDICITIS
• 550-553
  HERNIA OF ABDOMINAL CAVITY
• 555-558
  NONINFECTIOUS ENTERITIS AND COLITIS
• 560-569
  OTHER DISEASES OF INTESTINES AND PERITONEUM
• 570-579
  OTHER DISEASES OF DIGESTIVE SYSTEM

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