Malignant neoplasm of cerebral meninges

This code signifies a primary cancerous tumor originating in the protective membranes (dura mater, arachnoid mater, pia mater) that surround the brain. This malignancy arises directly within the cerebral meninges, as opposed to a tumor that has spread to this location from another primary site.

Utilize this code when documentation explicitly states a primary malignant neoplasm of the cerebral meninges. This diagnosis is typically confirmed through imaging studies (e.g., MRI, CT scan) and often a biopsy or surgical pathology report. It is appropriate for initial diagnosis, treatment, and follow-up of this specific primary cancer.

• Distinguish carefully between primary (C70.0) and secondary (C79.31) malignant neoplasms of the brain and cerebral meninges.
• Ensure documentation specifies "cerebral" meninges; other meningeal sites have different codes (e.g., C70.1 for spinal meninges).
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless another condition is clearly driving the visit.