Melanoma in situ of right upper limb, including shoulder

This code signifies the presence of melanoma that is confined to the epidermis (in situ) on the right upper limb, which includes the shoulder region. It represents the earliest stage of melanoma, where the malignant cells have not invaded beyond the basement membrane.

Apply this code when documentation clearly states a diagnosis of melanoma in situ specifically located on the right arm or shoulder. This diagnosis is typically confirmed by a pathology report following a biopsy or excision. Ensure the laterality (right) and the "in situ" nature of the lesion are explicitly documented.

• Always verify the pathology report for confirmation of "in situ" and the specific anatomical site.
• Distinguish from invasive melanoma (C43.-) where malignant cells have penetrated the dermis.
• Do not use for melanoma of unspecified laterality or for other types of skin cancer.