K55: Vascular disorders of intestine
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K56: Paralytic ileus and intestinal obstruction without hernia
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K57: Diverticular disease of intestine
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K58: Irritable bowel syndrome
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K59: Other functional intestinal disorders
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K60: Fissure and fistula of anal and rectal regions
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K61: Abscess of anal and rectal regions
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K62: Other diseases of anus and rectum
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K63: Other diseases of intestine
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