K51 Ulcerative colitis

⚠ Non-Billable ICD-10-CM 2026
Create your free account → Open K51 in the app →

Get what a quick lookup can't: the AI assistant for official-guideline questions, HCC risk-adjustment mappings (CMS-HCC V24/V28, RxHCC), FDA drug indications, and AHA Coding Clinic references for K51.

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

Cite This Page

Reference K51 with the canonical source and edition:

K51 — Ulcerative colitis. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/K51

Canonical URL: https://icd10codingpro.com/codes/K51

Related Codes

More Specific Codes

K51.0 Ulcerative (chronic) pancolitis K51.2 Ulcerative (chronic) proctitis K51.3 Ulcerative (chronic) rectosigmoiditis K51.4 Inflammatory polyps of colon K51.5 Left sided colitis K51.8 Other ulcerative colitis K51.9 Ulcerative colitis, unspecified

All Codes in K51

Every most-specific code under K51 Ulcerative colitis (49 codes):

Show the complete K51 code list
K51.00 Ulcerative (chronic) pancolitis without 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 K51.20 Ulcerative (chronic) proctitis without 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 K51.30 Ulcerative (chronic) rectosigmoiditis without 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 K51.40 Inflammatory polyps of colon without complications K51.411 Inflammatory polyps of colon with rectal bleeding K51.412 Inflammatory polyps of colon with intestinal obstruction K51.413 Inflammatory polyps of colon with fistula K51.414 Inflammatory polyps of colon with abscess K51.418 Inflammatory polyps of colon with other complication K51.419 Inflammatory polyps of colon with unspecified complications K51.50 Left sided colitis without complications K51.511 Left sided colitis with rectal bleeding K51.512 Left sided colitis with intestinal obstruction K51.513 Left sided colitis with fistula K51.514 Left sided colitis with abscess K51.518 Left sided colitis with other complication K51.519 Left sided colitis with unspecified complications K51.80 Other ulcerative colitis without complications K51.811 Other ulcerative colitis with rectal bleeding K51.812 Other ulcerative colitis with intestinal obstruction K51.813 Other ulcerative colitis with fistula K51.814 Other ulcerative colitis with abscess K51.818 Other ulcerative colitis with other complication K51.819 Other ulcerative colitis with unspecified complications K51.90 Ulcerative colitis, unspecified, without complications K51.911 Ulcerative colitis, unspecified with rectal bleeding K51.912 Ulcerative colitis, unspecified with intestinal obstruction K51.913 Ulcerative colitis, unspecified with fistula K51.914 Ulcerative colitis, unspecified with abscess K51.918 Ulcerative colitis, unspecified with other complication K51.919 Ulcerative colitis, unspecified with unspecified complications
Search all 70,000+ ICD-10-CM codes →
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

Get HCC Mappings, Clinical Summaries, and More

Access premium features including HCC risk adjustment, FDA drug indications, AI coding assistant, and comprehensive clinical context.

Start Free Trial