Desmoid tumor of back

This code represents a desmoid tumor, also known as an aggressive fibromatosis, specifically located in the back. Desmoid tumors are rare, locally aggressive, non-metastasizing soft tissue tumors that arise from musculoaponeurotic structures. While benign histologically, they can cause significant morbidity due to their infiltrative growth pattern.

Use this code when documentation clearly identifies a desmoid tumor originating in any part of the patient's back (e.g., thoracic, lumbar, sacral regions). This diagnosis is typically confirmed by biopsy and imaging studies such as MRI. Supporting documentation should include pathology reports confirming desmoid tumor and imaging reports specifying the back as the tumor's location.

• Ensure the documentation specifies "desmoid tumor" or "aggressive fibromatosis" and not another type of soft tissue tumor.
• Verify the exact anatomical location; if the tumor is in a different site, a more specific D48.1x code should be used.
• Do not confuse with malignant soft tissue sarcomas; desmoid tumors are classified as tumors of uncertain behavior.