Other ulcerative colitis with fistula

This code signifies a form of inflammatory bowel disease characterized by chronic inflammation and ulceration of the colon, specifically when a fistula (an abnormal connection between two epithelialized surfaces) has developed as a complication. It encompasses cases of ulcerative colitis that do not fit more specific classifications (e.g., pancolitis, proctosigmoiditis) but are complicated by fistulization.

Apply this code when documentation clearly indicates a diagnosis of ulcerative colitis, not otherwise specified to a particular anatomical extent, that has resulted in the formation of a fistula. This typically includes perianal, enterocutaneous, or other internal fistulas arising from the ulcerative colitis. Ensure the physician's notes explicitly state both "ulcerative colitis" and "fistula."

• Differentiate from Crohn's disease with fistula (K50.- series), as both can present with fistulas but have distinct underlying pathologies.
• Do not use if the documentation specifies a more precise anatomical extent of the ulcerative colitis (e.g., pancolitis, proctosigmoiditis) with fistula; instead, use the appropriate K51.3- or K51.5- code.
• Code any associated complications or manifestations of the fistula (e.g., abscess) separately, if documented.