ICD 10 Coding for Loose Bowel Movements Melanosis Coli El Atlas Gastrointestinal gastrointestinalatlas.com This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions “Melanosis” in the small and large intestine Melanosis coli is dark brown black pigmentation of colorectal mucosa associated with chronic use of laxatives containing anthraquinone. Examples of such laxatives include senna and rhubarb derivatives. Clinical Importance: There is no association Endoscopic Imaging of Melanosis Coli