Carcinoma in situ of skin of lower limb, including hip

This code signifies the presence of non-invasive malignant cells confined to the epidermis (carcinoma in situ) of the skin located anywhere on the lower extremity, including the hip region. These abnormal cells have not penetrated the basement membrane and are therefore considered pre-invasive.

This code is appropriate for documented cases of squamous cell carcinoma in situ (Bowen's disease) or melanoma in situ affecting the skin of the thigh, leg, ankle, foot, or hip. Use when pathology reports confirm carcinoma in situ without evidence of invasion.

• Differentiate from invasive squamous cell carcinoma or melanoma, which require different codes.
• Ensure the documentation specifies "in situ" and the anatomical site is clearly within the lower limb or hip.
• Do not use for benign lesions or dysplastic nevi, even if atypical.