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Melanoma of the rectum-extremely rare - I work for a large cancer

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Hello, I work for a large cancer center and we have a new case that is extremely rare in a patient with melanoma of the rectum to the anal verge path. I need some clarification as to how to code this since it is not "skin" related and it is the primary site. Is it coded c21.8 Malignant neoplasm of overlapping sites of rectum, anus and anal canal? or is there a specific "Melanoma" code for this? Melanoma is not listed on the Table of Neoplasms it is indexed on its own... any guidance with this would be greatly appreciated. Thank you in advance. DBeckley


True Blue
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Id go with the C21.8 as well. I know there is no code for primary internal malignant melanoma. I compare it to Melanoma of connective tissue, which in my index leads to see Neoplasm, connective tissue, malignant. Then I would apply the same logic to Internal Melanoma and code one of the neoplasm codes.