ICD-10-CM category
K51: Ulcerative colitis
Codes under K51 (Ulcerative colitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K51.0 | Ulcerative (chronic) pancolitis | — |
| K51.0 | Ulcerative (chronic) pancolitis | — |
| K51.00 | Ulcerative (chronic) pancolitis without complications | ✓ |
| K51.00 | Ulcerative (chronic) pancolitis without complications | ✓ |
| K51.01 | Ulcerative (chronic) pancolitis with complications | — |
| K51.01 | Ulcerative (chronic) pancolitis with complications | — |
| K51.2 | Ulcerative (chronic) proctitis | — |
| K51.2 | Ulcerative (chronic) proctitis | — |
| K51.3 | Ulcerative (chronic) rectosigmoiditis | — |
| K51.3 | Ulcerative (chronic) rectosigmoiditis | — |
| K51.4 | Inflammatory polyps of colon | — |
| K51.4 | Inflammatory polyps of colon | — |
| K51.5 | Left sided colitis | — |
| K51.5 | Left sided colitis | — |
| K51.8 | Other ulcerative colitis | — |
| K51.8 | Other ulcerative colitis | — |
| K51.9 | Ulcerative colitis, unspecified | — |
| K51.9 | Ulcerative colitis, unspecified | — |
| K51.011 | Ulcerative (chronic) pancolitis with rectal bleeding | ✓ |
| K51.011 | Ulcerative (chronic) pancolitis with rectal bleeding | ✓ |
| K51.012 | Ulcerative (chronic) pancolitis with intestinal obstruction | ✓ |
| K51.012 | Ulcerative (chronic) pancolitis with intestinal obstruction | ✓ |
| K51.013 | Ulcerative (chronic) pancolitis with fistula | ✓ |
| K51.013 | Ulcerative (chronic) pancolitis with fistula | ✓ |
| K51.014 | Ulcerative (chronic) pancolitis with abscess | ✓ |
| K51.014 | Ulcerative (chronic) pancolitis with abscess | ✓ |
| K51.018 | Ulcerative (chronic) pancolitis with other complication | ✓ |
| K51.018 | Ulcerative (chronic) pancolitis with other complication | ✓ |
| K51.019 | Ulcerative (chronic) pancolitis with unspecified complications | ✓ |
| K51.019 | Ulcerative (chronic) pancolitis with unspecified complications | ✓ |
| K51.20 | Ulcerative (chronic) proctitis without complications | ✓ |
| K51.20 | Ulcerative (chronic) proctitis without complications | ✓ |
| K51.21 | Ulcerative (chronic) proctitis with complications | — |
| K51.21 | Ulcerative (chronic) proctitis with complications | — |
| K51.30 | Ulcerative (chronic) rectosigmoiditis without complications | ✓ |
| K51.30 | Ulcerative (chronic) rectosigmoiditis without complications | ✓ |
| K51.31 | Ulcerative (chronic) rectosigmoiditis with complications | — |
| K51.31 | Ulcerative (chronic) rectosigmoiditis with complications | — |
| K51.40 | Inflammatory polyps of colon without complications | ✓ |
| K51.40 | Inflammatory polyps of colon without complications | ✓ |
| K51.41 | Inflammatory polyps of colon with complications | — |
| K51.41 | Inflammatory polyps of colon with complications | — |
| K51.50 | Left sided colitis without complications | ✓ |
| K51.50 | Left sided colitis without complications | ✓ |
| K51.51 | Left sided colitis with complications | — |
| K51.51 | Left sided colitis with complications | — |
| K51.80 | Other ulcerative colitis without complications | ✓ |
| K51.80 | Other ulcerative colitis without complications | ✓ |
| K51.81 | Other ulcerative colitis with complications | — |
| K51.81 | Other ulcerative colitis with complications | — |
| K51.90 | Ulcerative colitis, unspecified, without complications | ✓ |
| K51.90 | Ulcerative colitis, unspecified, without complications | ✓ |
| K51.91 | Ulcerative colitis, unspecified, with complications | — |
| K51.91 | Ulcerative colitis, unspecified, with complications | — |
| K51.211 | Ulcerative (chronic) proctitis with rectal bleeding | ✓ |
| K51.211 | Ulcerative (chronic) proctitis with rectal bleeding | ✓ |
| K51.212 | Ulcerative (chronic) proctitis with intestinal obstruction | ✓ |
| K51.212 | Ulcerative (chronic) proctitis with intestinal obstruction | ✓ |
| K51.213 | Ulcerative (chronic) proctitis with fistula | ✓ |
| K51.213 | Ulcerative (chronic) proctitis with fistula | ✓ |
| K51.214 | Ulcerative (chronic) proctitis with abscess | ✓ |
| K51.214 | Ulcerative (chronic) proctitis with abscess | ✓ |
| K51.218 | Ulcerative (chronic) proctitis with other complication | ✓ |
| K51.218 | Ulcerative (chronic) proctitis with other complication | ✓ |
| K51.219 | Ulcerative (chronic) proctitis with unspecified complications | ✓ |
| K51.219 | Ulcerative (chronic) proctitis with unspecified complications | ✓ |
| K51.311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding | ✓ |
| K51.311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding | ✓ |
| K51.312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstruction | ✓ |
| K51.312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstruction | ✓ |
| K51.313 | Ulcerative (chronic) rectosigmoiditis with fistula | ✓ |
| K51.313 | Ulcerative (chronic) rectosigmoiditis with fistula | ✓ |
| K51.314 | Ulcerative (chronic) rectosigmoiditis with abscess | ✓ |
| K51.314 | Ulcerative (chronic) rectosigmoiditis with abscess | ✓ |
| K51.318 | Ulcerative (chronic) rectosigmoiditis with other complication | ✓ |
| K51.318 | Ulcerative (chronic) rectosigmoiditis with other complication | ✓ |
| K51.319 | Ulcerative (chronic) rectosigmoiditis with unspecified complications | ✓ |
| K51.319 | Ulcerative (chronic) rectosigmoiditis with unspecified complications | ✓ |
| K51.411 | Inflammatory polyps of colon with rectal bleeding | ✓ |
| K51.411 | Inflammatory polyps of colon with rectal bleeding | ✓ |
| K51.412 | Inflammatory polyps of colon with intestinal obstruction | ✓ |
| K51.412 | Inflammatory polyps of colon with intestinal obstruction | ✓ |
| K51.413 | Inflammatory polyps of colon with fistula | ✓ |
| K51.413 | Inflammatory polyps of colon with fistula | ✓ |
| K51.414 | Inflammatory polyps of colon with abscess | ✓ |
| K51.414 | Inflammatory polyps of colon with abscess | ✓ |
| K51.418 | Inflammatory polyps of colon with other complication | ✓ |
| K51.418 | Inflammatory polyps of colon with other complication | ✓ |
| K51.419 | Inflammatory polyps of colon with unspecified complications | ✓ |
| K51.419 | Inflammatory polyps of colon with unspecified complications | ✓ |
| K51.511 | Left sided colitis with rectal bleeding | ✓ |
| K51.511 | Left sided colitis with rectal bleeding | ✓ |
| K51.512 | Left sided colitis with intestinal obstruction | ✓ |
| K51.512 | Left sided colitis with intestinal obstruction | ✓ |
| K51.513 | Left sided colitis with fistula | ✓ |
| K51.513 | Left sided colitis with fistula | ✓ |
| K51.514 | Left sided colitis with abscess | ✓ |
| K51.514 | Left sided colitis with abscess | ✓ |
| K51.518 | Left sided colitis with other complication | ✓ |
| K51.518 | Left sided colitis with other complication | ✓ |
| K51.519 | Left sided colitis with unspecified complications | ✓ |
| K51.519 | Left sided colitis with unspecified complications | ✓ |
| K51.811 | Other ulcerative colitis with rectal bleeding | ✓ |
| K51.811 | Other ulcerative colitis with rectal bleeding | ✓ |
| K51.812 | Other ulcerative colitis with intestinal obstruction | ✓ |
| K51.812 | Other ulcerative colitis with intestinal obstruction | ✓ |
| K51.813 | Other ulcerative colitis with fistula | ✓ |
| K51.813 | Other ulcerative colitis with fistula | ✓ |
| K51.814 | Other ulcerative colitis with abscess | ✓ |
| K51.814 | Other ulcerative colitis with abscess | ✓ |
| K51.818 | Other ulcerative colitis with other complication | ✓ |
| K51.818 | Other ulcerative colitis with other complication | ✓ |
| K51.819 | Other ulcerative colitis with unspecified complications | ✓ |
| K51.819 | Other ulcerative colitis with unspecified complications | ✓ |
| K51.911 | Ulcerative colitis, unspecified with rectal bleeding | ✓ |
| K51.911 | Ulcerative colitis, unspecified with rectal bleeding | ✓ |
| K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | ✓ |
| K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | ✓ |
| K51.913 | Ulcerative colitis, unspecified with fistula | ✓ |
| K51.913 | Ulcerative colitis, unspecified with fistula | ✓ |
| K51.914 | Ulcerative colitis, unspecified with abscess | ✓ |
| K51.914 | Ulcerative colitis, unspecified with abscess | ✓ |
| K51.918 | Ulcerative colitis, unspecified with other complication | ✓ |
| K51.918 | Ulcerative colitis, unspecified with other complication | ✓ |
| K51.919 | Ulcerative colitis, unspecified with unspecified complications | ✓ |
| K51.919 | Ulcerative colitis, unspecified with unspecified complications | ✓ |
Frequently asked questions
What is ICD-10-CM code K51?
K51 is an ICD-10-CM category covering Ulcerative colitis. It contains 126 more specific diagnosis codes, 98 of which are billable.
Is K51 a billable code?
No — K51 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example K51.0 — Ulcerative (chronic) pancolitis). 98 of the 126 codes under K51 are billable.
What codes fall under K51?
K51 includes K51.0, K51.0, K51.00, K51.00, K51.01, plus 121 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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