Carcinoma in situ of skin of unspecified part of face

This code signifies the presence of non-invasive squamous cell carcinoma or melanoma confined to the epidermis (carcinoma in situ) located on an unspecified area of the face. It represents a pre-malignant or very early-stage cancer that has not yet invaded deeper tissues.

Apply this code when documentation specifies carcinoma in situ of the skin on the face, but the precise anatomical subsite (e.g., nose, eyelid, lip) is not clearly identified. This diagnosis is typically made following a biopsy and histopathological examination confirming intraepidermal malignancy without dermal invasion.

• Ensure the documentation explicitly states "in situ" and specifies the "face" as the location.
• Avoid using this code if a more specific facial anatomical site is documented (e.g., D04.39 for other specified parts of face).
• Do not use for invasive carcinomas; those would be coded to the C44 series.