K51 Ulcerative colitis

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Ulcerative colitis is K51 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
K50-K52: Noninfective enteritis and colitis (K50-K52)
Category K51
64 codes (49 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with K51.
  • Crohn's disease [regional enteritis] (K50.-)
Use Additional Code
  • code to identify any associated fistulas, if applicable:
  • anal fistula (K60.3-)
  • anorectal fistula (K60.5-)
  • rectal fistula (K60.4-)
  • code to identify manifestations, such as:
  • pyoderma gangrenosum (L88)

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.11

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

K51.0 Ulcerative (chronic) pancolitis K51.00 Ulcerative (chronic) pancolitis without complications K51.01 Ulcerative (chronic) pancolitis with complications K51.011 Ulcerative (chronic) pancolitis with rectal bleeding K51.012 Ulcerative (chronic) pancolitis with intestinal obstruction K51.013 Ulcerative (chronic) pancolitis with fistula K51.014 Ulcerative (chronic) pancolitis with abscess K51.018 Ulcerative (chronic) pancolitis with other complication K51.019 Ulcerative (chronic) pancolitis with unspecified complications K51.2 Ulcerative (chronic) proctitis K51.20 Ulcerative (chronic) proctitis without complications K51.21 Ulcerative (chronic) proctitis with complications K51.211 Ulcerative (chronic) proctitis with rectal bleeding K51.212 Ulcerative (chronic) proctitis with intestinal obstruction K51.213 Ulcerative (chronic) proctitis with fistula K51.214 Ulcerative (chronic) proctitis with abscess K51.218 Ulcerative (chronic) proctitis with other complication K51.219 Ulcerative (chronic) proctitis with unspecified complications K51.3 Ulcerative (chronic) rectosigmoiditis K51.30 Ulcerative (chronic) rectosigmoiditis without complications K51.31 Ulcerative (chronic) rectosigmoiditis with complications K51.311 Ulcerative (chronic) rectosigmoiditis with rectal bleeding K51.312 Ulcerative (chronic) rectosigmoiditis with intestinal obstruction K51.313 Ulcerative (chronic) rectosigmoiditis with fistula K51.314 Ulcerative (chronic) rectosigmoiditis with abscess K51.318 Ulcerative (chronic) rectosigmoiditis with other complication K51.319 Ulcerative (chronic) rectosigmoiditis with unspecified complications K51.4 Inflammatory polyps of colon K51.40 Inflammatory polyps of colon without complications K51.41 Inflammatory polyps of colon with complications

Related Codes in K51

K51.0 Ulcerative (chronic) pancolitis K51.00 Ulcerative (chronic) pancolitis without complications K51.01 Ulcerative (chronic) pancolitis with complications K51.011 Ulcerative (chronic) pancolitis with rectal bleeding K51.012 Ulcerative (chronic) pancolitis with intestinal obstruction K51.013 Ulcerative (chronic) pancolitis with fistula K51.014 Ulcerative (chronic) pancolitis with abscess K51.018 Ulcerative (chronic) pancolitis with other complication K51.019 Ulcerative (chronic) pancolitis with unspecified complications K51.2 Ulcerative (chronic) proctitis K51.20 Ulcerative (chronic) proctitis without complications K51.21 Ulcerative (chronic) proctitis with complications K51.211 Ulcerative (chronic) proctitis with rectal bleeding K51.212 Ulcerative (chronic) proctitis with intestinal obstruction K51.213 Ulcerative (chronic) proctitis with fistula K51.214 Ulcerative (chronic) proctitis with abscess K51.218 Ulcerative (chronic) proctitis with other complication K51.219 Ulcerative (chronic) proctitis with unspecified complications K51.3 Ulcerative (chronic) rectosigmoiditis K51.30 Ulcerative (chronic) rectosigmoiditis without complications
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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