| K55049 | Acute infarction of large intestine, extent unspecified |
| K5505 | Acute (reversible) ischemia of intestine, part unspecified |
| K55051 | Focal (segmental) acute (reversible) ischemia of intestine, part unspecified |
| K55052 | Diffuse acute (reversible) ischemia of intestine, part unspecified |
| K55059 | Acute (reversible) ischemia of intestine, part and extent unspecified |
| K5506 | Acute infarction of intestine, part unspecified |
| K55061 | Focal (segmental) acute infarction of intestine, part unspecified |
| K55062 | Diffuse acute infarction of intestine, part unspecified |
| K55069 | Acute infarction of intestine, part and extent unspecified |
| K551 | Chronic vascular disorders of intestine |
| K552 | Angiodysplasia of colon |
| K5520 | Angiodysplasia of colon without hemorrhage |
| K5521 | Angiodysplasia of colon with hemorrhage |
| K553 | Necrotizing enterocolitis |
| K5530 | Necrotizing enterocolitis, unspecified |
| K5531 | Stage 1 necrotizing enterocolitis |
| K5532 | Stage 2 necrotizing enterocolitis |
| K5533 | Stage 3 necrotizing enterocolitis |
| K558 | Other vascular disorders of intestine |
| K559 | Vascular disorder of intestine, unspecified |
| K56 | Paralytic ileus and intestinal obstruction without hernia |
| K560 | Paralytic ileus |
| K561 | Intussusception |
| K562 | Volvulus |
| K563 | Gallstone ileus |
| K564 | Other impaction of intestine |
| K5641 | Fecal impaction |
| K5649 | Other impaction of intestine |
| K565 | Intestinal adhesions [bands] with obstruction (postinfection) |
| K5650 | Intestinal adhesions [bands], unspecified as to partial versus complete obstruction |
| K5651 | Intestinal adhesions [bands], with partial obstruction |
| K5652 | Intestinal adhesions [bands] with complete obstruction |
| K566 | Other and unspecified intestinal obstruction |
| K5660 | Unspecified intestinal obstruction |
| K56600 | Partial intestinal obstruction, unspecified as to cause |
| K56601 | Complete intestinal obstruction, unspecified as to cause |
| K56609 | Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction |
| K5669 | Other intestinal obstruction |
| K56690 | Other partial intestinal obstruction |
| K56691 | Other complete intestinal obstruction |
| K56699 | Other intestinal obstruction unspecified as to partial versus complete obstruction |
| K567 | Ileus, unspecified |
| K57 | Diverticular disease of intestine |
| K570 | Diverticulitis of small intestine with perforation and abscess |
| K5700 | Diverticulitis of small intestine with perforation and abscess without bleeding |
| K5701 | Diverticulitis of small intestine with perforation and abscess with bleeding |
| K571 | Diverticular disease of small intestine without perforation or abscess |
| K5710 | Diverticulosis of small intestine without perforation or abscess without bleeding |
| K5711 | Diverticulosis of small intestine without perforation or abscess with bleeding |
| K5712 | Diverticulitis of small intestine without perforation or abscess without bleeding |