Ulcerative (chronic) rectosigmoiditis with abscess

This code describes a chronic inflammatory condition affecting the rectum and sigmoid colon, characterized by ulceration and the formation of an abscess. It represents a severe manifestation of ulcerative colitis localized to the rectosigmoid region.

Use this code when documentation specifies ulcerative rectosigmoiditis with an associated abscess. This diagnosis typically requires endoscopic findings of ulceration and inflammation in the rectosigmoid, along with imaging or surgical confirmation of an abscess.

• Ensure documentation explicitly states "abscess" in conjunction with ulcerative rectosigmoiditis.
• Distinguish from Crohn's disease affecting the rectosigmoid, which has different coding pathways.
• Code any associated complications, such as fistula or stricture, separately if documented.