K51
⚠ Non-billable
Ulcerative colitis
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K51
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- 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-)
Frequently asked questions
What is ICD-10 code K51?
ICD-10-CM code K51 represents Ulcerative colitis. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K51 billable?
No. K51 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is K51 in?
K51 belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K51 category
K51.0
Ulcerative (chronic) pancolitis
Non-billable
K51.2
Ulcerative (chronic) proctitis
Non-billable
K51.3
Ulcerative (chronic) rectosigmoiditis
Non-billable
K51.4
Inflammatory polyps of colon
Non-billable
K51.5
Left sided colitis
Non-billable
K51.8
Other ulcerative colitis
Non-billable
K51.00
Ulcerative (chronic) pancolitis without complications
Billable
K51.01
Ulcerative (chronic) pancolitis with complications
Non-billable
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