Ulcerative (chronic) pancolitis with rectal bleeding

This code signifies a chronic inflammatory bowel disease affecting the entire colon, including the rectum, characterized by continuous inflammation and ulceration of the colonic mucosa. A key feature is the presence of active rectal bleeding, indicating disease activity and mucosal damage.

Apply this code when documentation confirms ulcerative colitis involving the entire colon (pancolitis) and explicitly states or implies active rectal bleeding. This typically occurs during acute exacerbations or persistent active disease. Supporting documentation includes colonoscopy reports, physician notes detailing symptoms, and pathology findings.

• Ensure documentation specifies "pancolitis" and not just a segment of the colon; otherwise, a more specific code for regional ulcerative colitis should be used.
• The presence of "rectal bleeding" is a mandatory component for this specific code; if bleeding is absent, a different subcategory of K51.0 should be selected.
• Always review for any associated complications, such as toxic megacolon or strictures, which would require additional coding.