Malignant neoplasm of brain stem

This code signifies a primary cancerous tumor originating within the brainstem, which includes the midbrain, pons, and medulla oblongata. These neoplasms are characterized by uncontrolled cell growth and can significantly impair vital neurological functions due to their critical location.

Apply this code when documentation explicitly states a primary malignant neoplasm of the brainstem. This diagnosis is typically supported by imaging studies (MRI, CT) confirming a mass in the brainstem, often with biopsy results or pathology reports indicating malignancy.

• Differentiate from secondary (metastatic) brainstem tumors; this code is for primary malignancy only.
• Ensure the documentation specifies "brainstem" and not a more general brain region.
• Review pathology reports carefully for definitive diagnosis of malignancy and primary site.