Ca in situ skin of right upper eyelid, including canthus

This code signifies the presence of non-invasive malignant cells confined to the epidermis of the skin on the right upper eyelid, including the inner or outer corner of the eye. This is an early form of cancer that has not spread beyond the top layer of skin.

Use this code when documentation explicitly states "carcinoma in situ" or "Bowen's disease" affecting the skin of the right upper eyelid or its canthus. This diagnosis is typically confirmed by biopsy results.

• Ensure the documentation specifies "in situ" to differentiate from invasive carcinoma.
• Verify laterality (right) and anatomical site (upper eyelid, including canthus) are clearly documented.
• Do not use this code for melanoma in situ; refer to the appropriate D03.- codes for melanoma.