Malignant melanoma of overlapping sites of skin

This code signifies a malignant melanoma that spans across two or more contiguous or overlapping anatomical sites of the skin. This includes cases where the primary tumor cannot be definitively assigned to a single specific skin site.

Use this code when documentation clearly indicates a malignant melanoma involving multiple adjacent skin sites, such as a lesion extending from the trunk to an upper limb, or from the face to the neck. Supporting documentation should specify the involvement of overlapping or contiguous skin regions.

• Do not use this code if the melanoma is confined to a single, well-defined anatomical site, even if it's large.
• Ensure the medical record explicitly states "overlapping sites" or describes the tumor's extension across multiple contiguous skin areas.
• Consider laterality (e.g., right vs. left) if specified, though this code does not differentiate laterality.