ICD-10 Code C79.32 – Secondary malignant neoplasm of cerebral meninges (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.32 – Secondary malignant neoplasm of cerebral meninges
What it is
This code identifies metastatic cancer involving the cerebral meninges, the protective membranes covering the brain. Use it when a primary malignancy has spread to these membranes.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic symptoms such as headache, cranial nerve deficits, seizures, or altered mental status when meningeal involvement is confirmed.
When to use this code
Use C79.32 when the record clearly documents secondary malignant involvement of the cerebral meninges, such as imaging, pathology, or specialist assessment. It applies when the metastasis is to the meninges of the brain, not simply to the brain parenchyma. Code the primary cancer separately when documented.
Do not use for
Do not use this code for primary meningeal tumors, unspecified intracranial metastasis, or metastases limited to the brain substance. Check documentation if the site is described only as “CNS” or “brain metastasis.”
Coding tip
Confirm the exact anatomic site in the note, because “meningeal” and “brain” metastases are coded differently.