ICD-10 Code K50.013 – Crohn’s disease of small intestine with fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K50.013 – Crohn’s disease of small intestine with fistula
What it is
This code identifies Crohn’s disease affecting the small intestine when a fistula is present. Use it for documented Crohn’s-related abnormal connection between the bowel and another organ, structure, or skin.
Clinical signs
Findings may include chronic abdominal pain, diarrhea, weight loss, and evidence of fistula formation such as drainage, recurrent infection, or passage between bowel segments. Clinical features vary; refer to documentation.
When to use this code
Use K50.013 when the provider documents Crohn’s disease of the small intestine and confirms a fistula. It applies whether the fistula is internal or external, as long as the record links it to Crohn’s disease. If the site or fistula type is unclear, check documentation.
Do not use for
Do not use this code for Crohn’s disease without fistula, or for fistulas unrelated to Crohn’s disease. Do not assign it if the record only says “possible” fistula or does not specify small intestine involvement.
Coding tip
Confirm both the Crohn’s location and the fistula in the provider note before assigning K50.013.