Carcinoma in situ of skin of left lower limb, including hip

This code signifies the presence of non-invasive squamous cell carcinoma or melanoma confined to the epidermis (carcinoma in situ) on the skin of the patient's left lower limb, encompassing the hip region. It indicates that the abnormal cells have not penetrated the basement membrane and are localized to the outermost layer of the skin.

Use this code when pathology reports confirm carcinoma in situ affecting the skin of the left leg, ankle, foot, or hip. Documentation should clearly specify the "in situ" nature of the lesion and its precise anatomical location on the left lower extremity.

• Ensure the pathology report explicitly states "carcinoma in situ" or "intraepidermal neoplasia" to differentiate from invasive carcinoma.
• Verify laterality (left lower limb) is clearly documented; do not use for unspecified or right-sided lesions.
• Distinguish from benign skin lesions or dysplastic nevi, which have different coding pathways.