CPT® Code 21931

The procedure described by CPT® Code 21931 involves the excision of a tumor located in the soft tissue of the back or flank, specifically when the tumor measures 3 cm or greater. 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 found within 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 surgical approach begins with making a skin incision directly over the tumor or creating and elevating a skin flap. 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. For tumors that are less than 3 cm in size, CPT® Code 21930 is applicable, while for tumors located below the fascia, CPT® Codes 21932 and 21933 are used for masses less than 5 cm and 5 cm or greater, respectively. It is important to note that subfascial soft tissue tumors are those found within muscle tissue.