Malignant neoplasm of spinal meninges

This code signifies a primary cancerous tumor originating from the meningeal layers that surround the spinal cord. These layers, the dura mater, arachnoid mater, and pia mater, provide protection to the central nervous system. The malignancy involves the cells of these protective membranes within the spinal column.

Apply this code when documentation confirms a primary malignant neoplasm of the spinal meninges. This diagnosis is typically established through imaging studies (MRI, CT) and confirmed by biopsy or surgical pathology reports. It is used for cases where the tumor originates in the spinal meninges, not for metastatic disease to this site.

• Differentiate from secondary malignant neoplasms (metastatic disease) to the spinal meninges, which would be coded with C79.49.
• Ensure the documentation specifies "primary" or "of spinal meninges" to avoid confusion with brain meninges (C70.0).
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated neurological deficits or complications.