| K56 | Paralytic ileus and intestinal obstruction without hernia | NON-BILLABLE CODE |
| K56.0 | Paralytic ileus | BILLABLE CODE |
| K56.1 | Intussusception | BILLABLE CODE |
| K56.2 | Volvulus | BILLABLE CODE |
| K56.3 | Gallstone ileus | BILLABLE CODE |
| K56.4 | Other impaction of intestine | NON-BILLABLE CODE |
| K56.41 | Fecal impaction | BILLABLE CODE |
| K56.5 | Intestinal adhesions [bands] with obstruction (postinfection) | NON-BILLABLE CODE |
| K56.50 | Intestinal adhesions [bands], unspecified as to partial versus complete obstruction | BILLABLE CODE |
| K56.51 | Intestinal adhesions [bands], with partial obstruction | BILLABLE CODE |
| K56.52 | Intestinal adhesions [bands] with complete obstruction | BILLABLE CODE |
| K56.6 | Other and unspecified intestinal obstruction | NON-BILLABLE CODE |
| K56.60 | Unspecified intestinal obstruction | NON-BILLABLE CODE |
| K56.600 | Partial intestinal obstruction, unspecified as to cause | BILLABLE CODE |
| K56.601 | Complete intestinal obstruction, unspecified as to cause | BILLABLE CODE |
| K56.609 | Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction | BILLABLE CODE |
| K56.69 | Other intestinal obstruction | NON-BILLABLE CODE |
| K56.690 | Other partial intestinal obstruction | BILLABLE CODE |
| K56.691 | Other complete intestinal obstruction | BILLABLE CODE |
| K56.699 | Other intestinal obstruction unspecified as to partial versus complete obstruction | BILLABLE CODE |
| K56.7 | Ileus, unspecified | BILLABLE CODE |
