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

This code signifies the presence of non-invasive malignant cells confined to the epidermis (carcinoma in situ) on the skin of any part of the lower limb, including the hip, when the specific location is not documented. It represents the earliest stage of squamous cell carcinoma or basal cell carcinoma, where the abnormal cells have not penetrated the basement membrane.

Apply this code when documentation indicates carcinoma in situ affecting the skin of the lower extremity or hip, and the precise anatomical site (e.g., thigh, calf, foot) is not specified. Supporting documentation typically includes pathology reports confirming in situ carcinoma and clinical notes indicating the general lower limb or hip as the affected area.

• Do not use this code if a more specific anatomical site on the lower limb is documented; instead, choose the appropriate D04.7- subcategory.
• Ensure the pathology report explicitly states "in situ" or "intraepidermal" to differentiate from invasive carcinoma.
• This code is for primary diagnosis when the in situ lesion is the reason for the encounter; otherwise, it may be a secondary diagnosis.