ICD-10 Code K51.919 – Ulcerative colitis, unspecified with unspecified complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K51.919 – Ulcerative colitis, unspecified with unspecified complications
What it is
This code identifies ulcerative colitis when the site is not specified and the chart also documents an unspecified complication. Use it when the record confirms ulcerative colitis but does not name a more precise form or complication.
Clinical signs
Clinical features vary; refer to documentation. Common findings in ulcerative colitis include chronic diarrhea, rectal bleeding, abdominal pain, urgency, and mucus in stool, but the complication must also be documented.
When to use this code
Use K51.919 when the provider states ulcerative colitis without identifying the affected segment and notes a complication, but the complication is not further specified. It also fits encounters where the diagnosis is established and the documentation does not support a more detailed ulcerative colitis code.
Do not use for
Do not use this code if the record identifies a specific ulcerative colitis type, such as proctitis or pancolitis, or if no complication is documented. Check documentation when the complication is named more precisely.
Coding tip
Code the most specific ulcerative colitis and complication documented; if either is unclear, query for clarification before assigning K51.919.