Pathology Outlines Melanosis coli Melanosis coli and colorectal cancer: Coincidence or correlated? ScienceDirect Frontiers Case report: Melanosis coli combined with colon cancer, causality or coincidence? Z86.010 Personal history of colonic polyps 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 ulcerative colitis with rectal bleeding ICD 10 code difference