Melanoma in situ of scalp and neck

This code identifies melanoma that is confined to the epidermis (in situ) and has not invaded the dermis or deeper tissues. It specifically refers to such lesions located on the scalp or neck region. This represents the earliest stage of melanoma development.

Apply this code when pathology reports confirm melanoma in situ originating from the scalp or neck. Documentation should clearly state "melanoma in situ" and specify the anatomical site as either the scalp or neck. This code is appropriate for initial diagnosis and subsequent follow-up of this specific condition.

• Ensure the pathology report explicitly states "in situ" and the anatomical site (scalp or neck).
• Do not use this code if the melanoma has invaded the dermis; instead, select a code for invasive melanoma.
• Distinguish carefully between melanoma in situ and dysplastic nevi, which are precancerous but not yet melanoma.