| 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 |
