CPT® Code 11640

A malignant lesion refers to an abnormal growth of cells that can invade surrounding tissues and potentially spread to other parts of the body. In the context of CPT® Code 11640, this procedure specifically involves the excision of such lesions located on the face, ears, eyelids, nose, lips, or mucous membranes. The excision is performed with the intent to remove not only the malignant tissue but also a margin of healthy tissue surrounding the lesion to ensure complete removal and minimize the risk of recurrence. Common types of malignant lesions that may be excised include basal cell carcinoma, squamous cell carcinoma, verrucous carcinoma, and melanoma. Prior to the excision, the area is thoroughly cleansed, and a local anesthetic is administered to ensure patient comfort during the procedure. The surgeon identifies a margin of healthy tissue around the lesion and makes a full-thickness incision through the dermis, which is the layer of skin beneath the epidermis. The incision is carefully made around the lesion, allowing for the complete excision of the malignant tissue. In some cases, a frozen section may be performed during the excision to evaluate the margins of the excised tissue in real-time. This is a critical step to confirm that no malignant cells are present at the edges of the excised tissue. If malignant cells are detected at the margins, additional tissue will be excised until clear margins are achieved. The excised lesion is then sent to a laboratory for histologic evaluation, which is a separate reportable service. To control any bleeding that may occur during the procedure, electrocautery or chemical cautery techniques are employed. After the excision, the surgical wound may be closed using a simple single-layer suture technique. However, depending on the complexity of the wound, other closure methods such as intermediate (layer) closure, complex repair, skin grafts, or pedicle flaps may also be utilized. This procedure is specifically coded as 11640 for lesions with an excised diameter of 0.5 cm or less, with additional codes available for larger excised diameters.