What isCpt code 21813?

CPT code 21813 refers to the excision of a tumor from the thoracic wall, specifically for a tumor that is deeper than the subcutaneous tissue but not involving the rib or sternum. This procedure typically includes the removal of the tumor along with a margin of surrounding tissue and is often performed for diagnostic or therapeutic purposes. It is important for healthcare providers to document the specifics of the procedure to ensure appropriate coding and billing.