Ca in situ skin of left upper eyelid, including canthus

This code identifies a non-invasive malignant epithelial neoplasm originating in the epidermis of the left upper eyelid, including the canthus. It signifies that the abnormal cells are confined to the top layer of skin and have not invaded deeper tissues. This is often referred to as Bowen's disease when affecting the skin.

Use this code for documented cases of carcinoma in situ specifically located on the left upper eyelid, including any involvement of the canthus. Documentation should clearly state "carcinoma in situ," "Bowen's disease," or "intraepidermal carcinoma" and specify the exact anatomical site.

• Ensure the documentation explicitly states "in situ" or "intraepidermal" to differentiate from invasive carcinoma.
• Verify laterality (left) and specific eyelid (upper) are clearly documented; do not assume.
• Distinguish from benign lesions or other malignant skin neoplasms that are not in situ.