Ulcerative (chronic) pancolitis with fistula

This code describes a severe, chronic inflammatory bowel disease affecting the entire colon (pancolitis) that has led to the formation of a fistula. A fistula is an abnormal connection between two epithelialized surfaces, often between the colon and another organ or the skin. This condition is characterized by continuous inflammation and ulceration throughout the large intestine, complicated by this specific anatomical defect.

Use this code when documentation clearly indicates a diagnosis of ulcerative pancolitis and explicitly states the presence of a fistula. This typically occurs in patients with long-standing or severe ulcerative colitis where the inflammatory process has eroded through the bowel wall. Supporting documentation should include endoscopy reports, surgical notes, or imaging studies confirming both pancolitis and the fistula.

• Ensure the documentation specifies "pancolitis" and not just "colitis" or "proctitis" to accurately reflect the extent of involvement.
• Verify that the fistula is a complication of the ulcerative colitis; if the fistula is unrelated, a different code may be more appropriate.
• Always look for documentation of the specific location or type of fistula if available, though this code does not require it.