CPT® Code 11604

The CPT® Code 11604 refers to the excision of a malignant lesion located on the trunk, arms, or legs, specifically when the excised diameter of the lesion measures between 3.1 to 4.0 centimeters. This procedure involves the surgical removal of the malignant tissue along with a margin of healthy tissue to ensure complete excision and minimize the risk of recurrence. Common types of malignant lesions that may be excised using this code include basal cell carcinoma, squamous cell carcinoma, verrucous carcinoma, and melanoma. The procedure begins with the cleansing of the area and the administration of a local anesthetic to ensure patient comfort. A full-thickness incision is made through the dermis, encircling the lesion to facilitate its complete removal. In some cases, a frozen section may be performed during the excision to verify that the margins are free of malignant cells. If any malignant tissue is detected at the margins, additional tissue will be excised until clear margins are achieved. The excised lesion is then sent for histologic evaluation to confirm the diagnosis and assess the margins. To control any bleeding that may occur during the procedure, electrocautery or chemical cautery is utilized. After the excision, the wound may be closed using a simple single-layer suture technique, although more complex closure methods such as intermediate (layer) closure, complex repair, skin grafts, or pedicle flaps may also be employed depending on the specific circumstances of the excision and the size of the wound.