Squamous cell carcinoma of skin of scalp and neck

This code signifies a malignant neoplasm originating from the squamous cells of the epidermis, specifically located on the scalp or neck. This aggressive form of skin cancer is characterized by uncontrolled growth of abnormal squamous cells.

Apply this code when documentation confirms a pathological diagnosis of squamous cell carcinoma affecting the skin of the scalp or neck. This is appropriate for both primary diagnoses and secondary diagnoses when the malignancy is being treated or monitored.

• Ensure the pathology report explicitly states "squamous cell carcinoma" and specifies the scalp or neck as the primary site.
• Distinguish from basal cell carcinoma (C44.41-) or melanoma (C43.4) of the same anatomical sites.
• Code any associated metastases separately, following the primary malignancy.