Squamous cell carcinoma skin/ left ear and extrn auric canal

This code identifies a malignant neoplasm originating from the squamous cells of the epidermis, specifically located on the left ear or within the external auditory canal. This is a common type of skin cancer, often associated with sun exposure, and can be locally aggressive if not treated.

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

• Ensure laterality is clearly documented as "left" to support this specific code.
• Distinguish from basal cell carcinoma (C44.21-) and melanoma (C43.2-) of the same anatomical site.
• Code any associated metastatic disease separately, following sequencing guidelines for primary and secondary malignancies.