ICD-10-CM
ICD-10 code for Ulcerative colitis: K51.90
The closest CDC title for "Ulcerative colitis" is K51.90, Ulcerative colitis, unspecified, without complications. K51.90 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under K51, then other CDC titles that name ulcerative colitis, unspecified, without complications
A header groups codes and is not billed. A billable code is one you can report.
- K51Ulcerative colitisHeader
- K51.0Ulcerative (chronic) pancolitisHeader
- K51.00Ulcerative (chronic) pancolitis without complicationsBillable
- K51.01Ulcerative (chronic) pancolitis with complicationsHeader
- K51.011Ulcerative (chronic) pancolitis with rectal bleedingBillable
- K51.012Ulcerative (chronic) pancolitis with intestinal obstructionBillable
- K51.013Ulcerative (chronic) pancolitis with fistulaBillable
- K51.014Ulcerative (chronic) pancolitis with abscessBillable
- K51.018Ulcerative (chronic) pancolitis with other complicationBillable
- K51.019Ulcerative (chronic) pancolitis with unspecified complicationsBillable
- K51.2Ulcerative (chronic) proctitisHeader
- K51.20Ulcerative (chronic) proctitis without complicationsBillable
- K51.21Ulcerative (chronic) proctitis with complicationsHeader
- K51.211Ulcerative (chronic) proctitis with rectal bleedingBillable
- K51.212Ulcerative (chronic) proctitis with intestinal obstructionBillable
- K51.213Ulcerative (chronic) proctitis with fistulaBillable
- K51.214Ulcerative (chronic) proctitis with abscessBillable
- K51.218Ulcerative (chronic) proctitis with other complicationBillable
- K51.219Ulcerative (chronic) proctitis with unspecified complicationsBillable
- K51.3Ulcerative (chronic) rectosigmoiditisHeader
- K51.30Ulcerative (chronic) rectosigmoiditis without complicationsBillable
- K51.31Ulcerative (chronic) rectosigmoiditis with complicationsHeader
- K51.311Ulcerative (chronic) rectosigmoiditis with rectal bleedingBillable
- K51.312Ulcerative (chronic) rectosigmoiditis with intestinal obstructionBillable
- K51.313Ulcerative (chronic) rectosigmoiditis with fistulaBillable
- K51.314Ulcerative (chronic) rectosigmoiditis with abscessBillable
- K51.318Ulcerative (chronic) rectosigmoiditis with other complicationBillable
- K51.319Ulcerative (chronic) rectosigmoiditis with unspecified complicationsBillable
- K51.4Inflammatory polyps of colonHeader
- K51.40Inflammatory polyps of colon without complicationsBillable
- K51.41Inflammatory polyps of colon with complicationsHeader
- K51.411Inflammatory polyps of colon with rectal bleedingBillable
- K51.412Inflammatory polyps of colon with intestinal obstructionBillable
- K51.413Inflammatory polyps of colon with fistulaBillable
- K51.414Inflammatory polyps of colon with abscessBillable
- K51.418Inflammatory polyps of colon with other complicationBillable
- K51.419Inflammatory polyps of colon with unspecified complicationsBillable
- K51.5Left sided colitisHeader
- K51.50Left sided colitis without complicationsBillable
- K51.51Left sided colitis with complicationsHeader
- K51.511Left sided colitis with rectal bleedingBillable
- K51.512Left sided colitis with intestinal obstructionBillable
- K51.513Left sided colitis with fistulaBillable
- K51.514Left sided colitis with abscessBillable
- K51.518Left sided colitis with other complicationBillable
- K51.519Left sided colitis with unspecified complicationsBillable
- K51.8Other ulcerative colitisHeader
- K51.80Other ulcerative colitis without complicationsBillable
- K51.81Other ulcerative colitis with complicationsHeader
- K51.811Other ulcerative colitis with rectal bleedingBillable
- K51.812Other ulcerative colitis with intestinal obstructionBillable
- K51.813Other ulcerative colitis with fistulaBillable
- K51.814Other ulcerative colitis with abscessBillable
- K51.818Other ulcerative colitis with other complicationBillable
- K51.819Other ulcerative colitis with unspecified complicationsBillable
- K51.9Ulcerative colitis, unspecifiedHeader
- K51.90Ulcerative colitis, unspecified, without complicationsBillable
- K51.91Ulcerative colitis, unspecified, with complicationsHeader
- K51.911Ulcerative colitis, unspecified with rectal bleedingBillable
- K51.912Ulcerative colitis, unspecified with intestinal obstructionBillable
- K51.913Ulcerative colitis, unspecified with fistulaBillable
- K51.914Ulcerative colitis, unspecified with abscessBillable
- K51.918Ulcerative colitis, unspecified with other complicationBillable
- K51.919Ulcerative colitis, unspecified with unspecified complicationsBillable
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From K51. A note on a category applies to every code under it.
Use additional code to identify any associated fistulas, if applicable:
- K60.3-Anal fistula
- K60.5-Anorectal fistula
- K60.4-Rectal fistula
- code to identify manifestations, such as:
- L88Pyoderma gangrenosum
Excludes1
Excludes1 means these codes are not reported together.
From K51. A note on a category applies to every code under it.
Related conditions
Related pages
- K51.90 code detailsNotes, nearby codes, CMS-HCC group
- Category K51Every code under it
- Chapter 11Diseases of the digestive system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Ulcerative colitis?
The closest CDC title for "Ulcerative colitis" is K51.90, Ulcerative colitis, unspecified, without complications. K51.90 is a billable code.
Is K51.90 billable?
Yes. K51.90 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to K51.90?
The CDC tabular list gives 1 Excludes1 note (not coded together), 6 "use additional code" notes for K51.90 and the categories above it. They are listed on this page.
What chapter is K51.90 in?
Chapter 11. Diseases of the digestive system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.