- K55.-
- Vascular disorders of intestine
- K56.-
- Paralytic ileus and intestinal obstruction without hernia
- K57.-
- Diverticular disease of intestine
- K58.-
- Irritable bowel syndrome
- K59.-
- Other functional intestinal disorders
- K60.-
- Fissure and fistula of anal and rectal regions
- K61.-
- Abscess of anal and rectal regions
- K62.-
- Other diseases of anus and rectum
- K63.-
- Other diseases of intestine
- K64.-
- Hemorrhoids and perianal venous thrombosis
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