ICD-10 Code K50.813 – Crohn’s disease of both small and large intestine with fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K50.813 – Crohn’s disease of both small and large intestine with fistula
What it is
This code identifies Crohn’s disease involving both the small and large intestine, with a fistula present. Use it when documentation confirms this specific Crohn’s location and complication.
Clinical signs
Typical findings include chronic inflammatory bowel symptoms with evidence of a fistula, such as an abnormal connection between bowel loops or to another organ. Clinical features vary; refer to documentation.
When to use this code
Use K50.813 when the record clearly states Crohn’s disease affecting both small and large intestine and also documents a fistula. This may appear in operative notes, imaging reports, or specialist assessments. If the site or fistula status is unclear, check documentation.
Do not use for
Do not use this code if Crohn’s disease is limited to only the small intestine or only the large intestine. Also avoid it when a fistula is not documented or when the chart says to check documentation.
Coding tip
Confirm both the bowel location and the fistula complication before assigning K50.813.