| K51 | Ulcerative colitis | NON-BILLABLE CODE |
| K51.0 | Ulcerative (chronic) pancolitis | NON-BILLABLE CODE |
| K51.00 | Ulcerative (chronic) pancolitis without complications | BILLABLE CODE |
| K51.01 | Ulcerative (chronic) pancolitis with complications | NON-BILLABLE CODE |
| K51.011 | Ulcerative (chronic) pancolitis with rectal bleeding | BILLABLE CODE |
| K51.012 | Ulcerative (chronic) pancolitis with intestinal obstruction | BILLABLE CODE |
| K51.013 | Ulcerative (chronic) pancolitis with fistula | BILLABLE CODE |
| K51.014 | Ulcerative (chronic) pancolitis with abscess | BILLABLE CODE |
| K51.018 | Ulcerative (chronic) pancolitis with other complication | BILLABLE CODE |
| K51.019 | Ulcerative (chronic) pancolitis with unspecified complications | BILLABLE CODE |
| K51.2 | Ulcerative (chronic) proctitis | NON-BILLABLE CODE |
| K51.20 | Ulcerative (chronic) proctitis without complications | BILLABLE CODE |
| K51.21 | Ulcerative (chronic) proctitis with complications | NON-BILLABLE CODE |
| K51.211 | Ulcerative (chronic) proctitis with rectal bleeding | BILLABLE CODE |
| K51.212 | Ulcerative (chronic) proctitis with intestinal obstruction | BILLABLE CODE |
| K51.213 | Ulcerative (chronic) proctitis with fistula | BILLABLE CODE |
| K51.214 | Ulcerative (chronic) proctitis with abscess | BILLABLE CODE |
| K51.218 | Ulcerative (chronic) proctitis with other complication | BILLABLE CODE |
| K51.219 | Ulcerative (chronic) proctitis with unspecified complications | BILLABLE CODE |
| K51.3 | Ulcerative (chronic) rectosigmoiditis | NON-BILLABLE CODE |
| K51.30 | Ulcerative (chronic) rectosigmoiditis without complications | BILLABLE CODE |
| K51.31 | Ulcerative (chronic) rectosigmoiditis with complications | NON-BILLABLE CODE |
| K51.311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding | BILLABLE CODE |
| K51.312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstruction | BILLABLE CODE |
| K51.313 | Ulcerative (chronic) rectosigmoiditis with fistula | BILLABLE CODE |
| K51.314 | Ulcerative (chronic) rectosigmoiditis with abscess | BILLABLE CODE |
| K51.318 | Ulcerative (chronic) rectosigmoiditis with other complication | BILLABLE CODE |
| K51.319 | Ulcerative (chronic) rectosigmoiditis with unspecified complications | BILLABLE CODE |
| K51.4 | Inflammatory polyps of colon | NON-BILLABLE CODE |
| K51.40 | Inflammatory polyps of colon without complications | BILLABLE CODE |
| K51.41 | Inflammatory polyps of colon with complications | NON-BILLABLE CODE |
| K51.411 | Inflammatory polyps of colon with rectal bleeding | BILLABLE CODE |
| K51.412 | Inflammatory polyps of colon with intestinal obstruction | BILLABLE CODE |
| K51.413 | Inflammatory polyps of colon with fistula | BILLABLE CODE |
| K51.414 | Inflammatory polyps of colon with abscess | BILLABLE CODE |
| K51.418 | Inflammatory polyps of colon with other complication | BILLABLE CODE |
| K51.419 | Inflammatory polyps of colon with unspecified complications | BILLABLE CODE |
| K51.5 | Left sided colitis | NON-BILLABLE CODE |
| K51.50 | Left sided colitis without complications | BILLABLE CODE |
| K51.51 | Left sided colitis with complications | NON-BILLABLE CODE |
| K51.511 | Left sided colitis with rectal bleeding | BILLABLE CODE |
| K51.512 | Left sided colitis with intestinal obstruction | BILLABLE CODE |
| K51.513 | Left sided colitis with fistula | BILLABLE CODE |
| K51.514 | Left sided colitis with abscess | BILLABLE CODE |
| K51.518 | Left sided colitis with other complication | BILLABLE CODE |
| K51.519 | Left sided colitis with unspecified complications | BILLABLE CODE |
| K51.8 | Other ulcerative colitis | NON-BILLABLE CODE |
| K51.80 | Other ulcerative colitis without complications | BILLABLE CODE |
| K51.81 | Other ulcerative colitis with complications | NON-BILLABLE CODE |
| K51.811 | Other ulcerative colitis with rectal bleeding | BILLABLE CODE |
| K51.812 | Other ulcerative colitis with intestinal obstruction | BILLABLE CODE |
| K51.813 | Other ulcerative colitis with fistula | BILLABLE CODE |
| K51.814 | Other ulcerative colitis with abscess | BILLABLE CODE |
| K51.818 | Other ulcerative colitis with other complication | BILLABLE CODE |
| K51.9 | Ulcerative colitis, unspecified | NON-BILLABLE CODE |
| K51.90 | Ulcerative colitis, unspecified, without complications | BILLABLE CODE |
| K51.91 | Ulcerative colitis, unspecified, with complications | NON-BILLABLE CODE |
| K51.911 | Ulcerative colitis, unspecified with rectal bleeding | BILLABLE CODE |
| K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | BILLABLE CODE |
| K51.913 | Ulcerative colitis, unspecified with fistula | BILLABLE CODE |
| K51.914 | Ulcerative colitis, unspecified with abscess | BILLABLE CODE |
| K51.918 | Ulcerative colitis, unspecified with other complication | BILLABLE CODE |
| K51.919 | Ulcerative colitis, unspecified with unspecified complications | BILLABLE CODE |
