| K63 | Other diseases of intestine | NON-BILLABLE CODE |
| K63.1 | Perforation of intestine (nontraumatic) | BILLABLE CODE |
| K63.2 | Fistula of intestine | BILLABLE CODE |
| K63.3 | Ulcer of intestine | BILLABLE CODE |
| K63.4 | Enteroptosis | BILLABLE CODE |
| K63.5 | Polyp of colon | BILLABLE CODE |
| K63.8 | Other specified diseases of intestine | NON-BILLABLE CODE |
| K63.81 | Dieulafoy lesion of intestine | BILLABLE CODE |
| K63.82 | Intestinal microbial overgrowth | NON-BILLABLE CODE |
| K63.821 | Small intestinal bacterial overgrowth | NON-BILLABLE CODE |
| K63.8211 | Small intestinal bacterial overgrowth, hydrogen-subtype | BILLABLE CODE |
| K63.8212 | Small intestinal bacterial overgrowth, hydrogen sulfide-subtype | BILLABLE CODE |
| K63.8219 | Small intestinal bacterial overgrowth, unspecified | BILLABLE CODE |
| K63.822 | Small intestinal fungal overgrowth | BILLABLE CODE |
| K63.829 | Intestinal methanogen overgrowth, unspecified | BILLABLE CODE |
| K63.89 | Other specified diseases of intestine | BILLABLE CODE |
| K63.9 | Disease of intestine, unspecified | BILLABLE CODE |
