Malignant neoplasm of craniopharyngeal duct

This diagnosis code signifies a primary cancerous tumor originating from the craniopharyngeal duct, also known as Rathke's pouch. These neoplasms are typically found in the sellar or suprasellar region of the brain, often impacting the pituitary gland and surrounding structures. The most common type of malignant tumor arising from this embryonic remnant is craniopharyngioma.

Utilize this code for documented cases of primary malignant craniopharyngioma or other malignant neoplasms definitively identified as arising from the craniopharyngeal duct. Supporting documentation should include pathology reports confirming malignancy and the origin from craniopharyngeal duct remnants, or clear clinical and imaging findings consistent with a primary malignant tumor in this specific anatomical location.

• Differentiate from benign craniopharyngioma, which is coded elsewhere.
• Ensure documentation specifies "malignant" and the primary site as the craniopharyngeal duct.
• Code any associated secondary malignancies or metastases separately.