Malignant neoplasm of thymus

This code represents a primary cancerous tumor originating in the thymus gland, a small organ located behind the sternum that plays a vital role in the immune system. These malignant neoplasms can include various histological types such as thymomas, thymic carcinomas, and thymic neuroendocrine tumors, excluding carcinoid tumors. The malignancy signifies uncontrolled growth and potential spread to other parts of the body.

Use this code when documentation confirms a primary malignant neoplasm of the thymus gland. This diagnosis is typically established through biopsy and histopathological examination. Supporting documentation will include pathology reports, imaging studies (CT, MRI), and physician notes detailing the tumor's origin and malignant nature.

• Always verify the primary site of the malignancy; ensure the thymus is the origin, not a metastatic site.
• Distinguish between malignant thymoma and thymic carcinoma, as both fall under this code.
• Remember the Excludes1 note: never code with C7A.091 for malignant carcinoid tumor of the thymus.