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 Coli: A Case of Mistaken IdentityA Case Report The Permanente Journal 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 ICD 10 Code C18.7: Malignant Neoplasm of Sigmoid Colon Pabau ICD 10 CM Coding of Colorectal Polyps Conquer Colon Polyp Dx Coding for Clean Claims : ICD 10