CPT® Code 21555

The procedure described by CPT® Code 21555 involves the excision of a tumor located in the soft tissue of the neck or anterior thorax, specifically targeting subcutaneous tissues. 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 approach to excising the tumor depends on its specific location within the soft tissue. This may involve making an incision in the skin over the tumor, creating and elevating a skin flap, or making a series of incisions along natural skin creases to facilitate exposure of the tumor. Once the overlying tissue is dissected, the soft tissue mass is exposed, allowing for the excision of the tumor 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 separately reportable procedure. After the tumor is excised, drains may be placed as necessary, and the surgical wound is typically closed in layers. For coding purposes, CPT® Code 21555 is specifically used for tumors in the subcutaneous fat or connective tissue that measure less than 3 cm, while other codes are designated for larger tumors or those located deeper within the fascia.