Melanoma in situ of other sites

This code represents melanoma that is confined to the epidermis (in situ) and has not invaded the dermis, occurring in anatomical sites not specifically classified elsewhere. It signifies the earliest stage of melanoma, where abnormal melanocytes are present but have not spread beyond the top layer of skin.

Assign this code when documentation clearly states a diagnosis of melanoma in situ located on a site other than the face, scalp, eyelid, ear, trunk, upper limb, lower limb, or foot. This diagnosis is typically confirmed by biopsy and histopathological examination.

• Ensure the pathology report explicitly states "melanoma in situ" and specifies a non-listed anatomical site.
• Do not code with D07.61 (carcinoma in situ of scrotum) as per the Excludes1 note.
• If the specific site is known and has a more precise D03 subcategory, use that code instead.