ICD-10 · PDGM grouping
K51 Ulcerative colitis
All 49 codes in the K51 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
49
Can lead a claim
42
Cannot lead a claim
7
What CMS assigns to K51
42 of the 49 codes group to MMTA - Gastrointestinal tract and Genitourinary system (36) and MMTA - Other (6); 7 are assigned no clinical group. 42 of the 49 count toward the Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders comorbidity subgroup; 7 are assigned none. 42 of the 49 can lead a claim.
- Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders
Every code in K51
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| K51.0 Ulcerative (chronic) pancolitis | ||||
| K51.00 | Ulcerative (chronic) pancolitis without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.01 Ulcerative (chronic) pancolitis with complications | ||||
| K51.011 | Ulcerative (chronic) pancolitis with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.012 | Ulcerative (chronic) pancolitis with intestinal obstruction | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.013 | Ulcerative (chronic) pancolitis with fistula | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.014 | Ulcerative (chronic) pancolitis with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.018 | Ulcerative (chronic) pancolitis with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.019 | Ulcerative (chronic) pancolitis with unspecified complicationsCMS: Ulcerative (chronic) pancolitis with unsp complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.2 Ulcerative (chronic) proctitis | ||||
| K51.20 | Ulcerative (chronic) proctitis without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.21 Ulcerative (chronic) proctitis with complications | ||||
| K51.211 | Ulcerative (chronic) proctitis with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.212 | Ulcerative (chronic) proctitis with intestinal obstruction | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.213 | Ulcerative (chronic) proctitis with fistula | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.214 | Ulcerative (chronic) proctitis with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.218 | Ulcerative (chronic) proctitis with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.219 | Ulcerative (chronic) proctitis with unspecified complicationsCMS: Ulcerative (chronic) proctitis with unsp complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.3 Ulcerative (chronic) rectosigmoiditis | ||||
| K51.30 | Ulcerative (chronic) rectosigmoiditis without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.31 Ulcerative (chronic) rectosigmoiditis with complications | ||||
| K51.311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstructionCMS: Ulcerative (chronic) rectosigmoiditis w intestinal obst | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.313 | Ulcerative (chronic) rectosigmoiditis with fistula | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.314 | Ulcerative (chronic) rectosigmoiditis with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.318 | Ulcerative (chronic) rectosigmoiditis with other complicationCMS: Ulcerative (chronic) rectosigmoiditis with oth complication | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.319 | Ulcerative (chronic) rectosigmoiditis with unspecified complicationsCMS: Ulcerative (chronic) rectosigmoiditis w unsp complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.4 Inflammatory polyps of colon | ||||
| K51.40 | Inflammatory polyps of colon without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.41 Inflammatory polyps of colon with complications | ||||
| K51.411 | Inflammatory polyps of colon with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.412 | Inflammatory polyps of colon with intestinal obstruction | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.413 | Inflammatory polyps of colon with fistula | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.414 | Inflammatory polyps of colon with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.418 | Inflammatory polyps of colon with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.419 | Inflammatory polyps of colon with unspecified complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.5 Left sided colitis | ||||
| K51.50 | Left sided colitis without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.51 Left sided colitis with complications | ||||
| K51.511 | Left sided colitis with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.512 | Left sided colitis with intestinal obstruction | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.513 | Left sided colitis with fistula | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.514 | Left sided colitis with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.518 | Left sided colitis with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.519 | Left sided colitis with unspecified complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.8 Other ulcerative colitis | ||||
| K51.80 | Other ulcerative colitis without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.81 Other ulcerative colitis with complications | ||||
| K51.811 | Other ulcerative colitis with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.812 | Other ulcerative colitis with intestinal obstruction | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.813 | Other ulcerative colitis with fistula | Can lead a claim | A | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.814 | Other ulcerative colitis with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.818 | Other ulcerative colitis with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.819 | Other ulcerative colitis with unspecified complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| K51.9 Ulcerative colitis, unspecified | ||||
| K51.90 | Ulcerative colitis, unspecified, without complications | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.91 Ulcerative colitis, unspecified, with complications | ||||
| K51.911 | Ulcerative colitis, unspecified with rectal bleeding | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.913 | Ulcerative colitis, unspecified with fistula | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.914 | Ulcerative colitis, unspecified with abscess | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.918 | Ulcerative colitis, unspecified with other complication | Can lead a claim | J | Crohn’s, Ulcerative Colitis, and other Functional Intestinal Disorders |
| K51.919 | Ulcerative colitis, unspecified with unspecified complicationsCMS: Ulcerative colitis, unsp with unspecified complications | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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