Malignant neoplasm of thymus

This code signifies a primary cancerous tumor originating in the thymus gland. This rare malignancy, often referred to as thymic carcinoma, involves abnormal cell growth within the thymic tissue, which plays a role in the immune system.

Apply this code when documentation clearly indicates a primary malignant neoplasm of the thymus. This diagnosis is typically confirmed through biopsy and histopathological examination. Use this code for the initial diagnosis and subsequent treatment of thymic carcinoma.

• Differentiate from benign thymoma (212.6) and metastatic disease to the thymus, which would require a secondary malignancy code.
• Ensure the pathology report explicitly states "malignant neoplasm" or "carcinoma" of the thymus.
• Do not use for thymic hyperplasia or other non-neoplastic thymic conditions.