ICD-10 Code K51.00 – Ulcerative (chronic) pancolitis without complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.00 – Ulcerative (chronic) pancolitis without complications
What it is
K51.00 identifies ulcerative colitis affecting the entire colon, with no documented complications. Use it when the record clearly states pancolitis and does not mention bleeding, obstruction, perforation, or other complications.
Clinical signs
Typical findings include chronic colitis symptoms such as diarrhea, abdominal pain, urgency, and rectal bleeding. Clinical features vary; refer to documentation for extent, severity, and whether complications are present.
When to use this code
Use K51.00 when the provider documents ulcerative pancolitis, chronic ulcerative colitis of the entire colon, or equivalent wording without complications. It is also appropriate when the chart confirms pancolitis and explicitly excludes complication terms. Check documentation if the record is vague or only says ulcerative colitis.
Do not use for
Do not use this code for ulcerative colitis limited to the rectum, sigmoid, or left side of the colon. Also avoid it when complications are documented, or when the type of colitis is uncertain.
Coding tip
Confirm both the extent of disease and the absence of complications before assigning K51.00.