Malignant neoplasm of pituitary gland

This code signifies the presence of a cancerous tumor originating within the pituitary gland. This gland, located at the base of the brain, is crucial for hormone regulation, and its malignancy can lead to various endocrine dysfunctions and neurological symptoms.

Use this code when documentation confirms a primary malignant neoplasm of the pituitary gland, typically identified through imaging (e.g., MRI) and often confirmed by biopsy. This applies to cases where the tumor is definitively diagnosed as cancerous and originated in the pituitary, rather than being a metastasis from another site.

• Differentiate between primary malignant neoplasms and secondary (metastatic) tumors to the pituitary; use C79.31 for secondary malignancies.
• Ensure documentation specifies "malignant" to distinguish from benign pituitary adenomas (D35.2).
• Consider additional codes for specific endocrine disorders or neurological deficits resulting from the pituitary malignancy.