CPT® Code 21930

The CPT® Code 21930 refers to the excision of a tumor located in the soft tissue of the back or flank, specifically when the tumor is subcutaneous and measures less than 3 cm in size. Soft tissues encompass a variety of structures, including subcutaneous fat, connective tissue, fascia, muscles, tendons, blood vessels, lymph vessels, nerves, and the tissues surrounding joints. Tumors that arise in these soft tissues can be either benign or malignant. Typically, benign tumors are treated through excision, while small malignant or indeterminate tumors may also be excised if they have well-defined margins. The procedure begins with the creation of a skin incision directly over the tumor, or alternatively, a skin flap may be elevated to access the tumor. The surgeon then dissects the overlying tissue to expose the soft tissue mass. Following this, the tumor is excised along with a margin of healthy tissue to ensure complete removal. In some cases, a frozen section may be performed to verify that all margins are free of tumor cells, which is a separate reportable procedure. After the excision, drains may be placed as necessary, and the surgical wound is closed in layers to promote proper healing. For coding purposes, CPT® Code 21930 is specifically designated for tumors in the subcutaneous fat or connective tissue that are less than 3 cm in size, while other codes are available for larger tumors or those located deeper within the fascia.