Desmoid tumor of head and neck

This code signifies a desmoid tumor, also known as aggressive fibromatosis, specifically located in the head and neck region. These are rare, locally invasive, non-metastasizing soft tissue tumors characterized by uncontrolled proliferation of fibroblasts and myofibroblasts. While benign, they can cause significant morbidity due to their infiltrative growth pattern and potential for recurrence.

Use this code when documentation confirms a diagnosis of a desmoid tumor originating in any part of the head or neck, such as the scalp, face, or cervical region. Supporting documentation should include pathology reports confirming aggressive fibromatosis and imaging studies detailing the tumor's location. This code is appropriate for initial diagnosis, treatment, and follow-up care for this specific tumor type and location.

• Ensure the pathology report explicitly states "desmoid tumor" or "aggressive fibromatosis" and clearly indicates a head and neck primary site.
• Do not confuse this with other benign soft tissue tumors or malignant neoplasms; desmoid tumors have distinct biological behavior.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by any associated symptoms or complications.