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 malignant growths can disrupt vital neurological functions controlled by this critical part of the central nervous system.

Apply this code when documentation explicitly states a primary malignant neoplasm located in the brainstem. This diagnosis is typically supported by imaging studies (e.g., MRI, CT) and often confirmed by biopsy or surgical pathology reports.

• Ensure the documentation specifies "malignant" and "primary" to differentiate from benign tumors or metastatic disease.
• Do not use for secondary (metastatic) brainstem tumors; refer to codes in category C79.
• Sequence as the primary diagnosis when the brainstem neoplasm is the reason for the encounter or treatment.