ICD-10 Code C79.3 – Secondary malignant neoplasm of brain and cerebral meninges (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.3 – Secondary malignant neoplasm of brain and cerebral meninges
What it is
This code identifies metastatic cancer that has spread to the brain or cerebral meninges from a primary site elsewhere. Use it when the record documents secondary malignant involvement of these intracranial structures.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include neurologic deficits, seizures, headache, confusion, or signs of increased intracranial pressure when brain or meningeal metastases are present.
When to use this code
Use C79.3 when the provider documents metastatic disease to the brain or cerebral meninges, including imaging-supported or pathology-supported secondary involvement. Code it when the note clearly states “secondary,” “metastatic,” or equivalent language for these sites.
If the chart identifies the primary cancer, you may also need the code for that malignancy, as instructed by the record and coding rules. Check documentation for laterality, site detail, and whether the metastasis is confirmed.
Do not use for
Do not use this code for primary brain tumors or benign intracranial lesions. Do not assign it when brain symptoms are present but metastatic disease is not documented; check documentation.
Coding tip
Confirm that the secondary nature and intracranial site are both stated before assigning C79.3.