ICD-10 Code C70 – Malignant neoplasm of meninges (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C70 – Malignant neoplasm of meninges
What it is
C70 identifies a malignant tumor arising from the meninges, the membranes that cover the brain and spinal cord. Use it when the documentation specifies a cancer of these coverings rather than a brain or spinal cord tumor.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include neurologic symptoms related to mass effect or meningeal involvement, but the diagnosis must be supported by the provider’s record.
When to use this code
Use C70 when the record clearly states malignant neoplasm of the meninges, including primary or site-specific meningeal cancer. It may also apply when the provider documents a malignant meningeal tumor without naming a more specific site. If the site is uncertain, check documentation.
Do not use for
Do not use this code for benign meningioma, metastatic disease to the meninges, or malignant tumors of the brain or spinal cord. If the documentation does not clearly identify the meninges, check documentation.
Coding tip
Confirm the exact anatomic site in the pathology or provider note before assigning C70.