ICD-10 Code D33.9 – Benign neoplasm of central nervous system, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D33.9 – Benign neoplasm of central nervous system, unspecified
What it is
D33.9 identifies a noncancerous tumor of the central nervous system when the site is not further specified. Use it for benign brain or spinal cord neoplasms documented without a more exact location.
Clinical signs
Clinical features vary; refer to documentation. Patients may have symptoms from mass effect or local neurologic involvement, but the record must support a benign CNS neoplasm and an unspecified site.
When to use this code
Use D33.9 when the provider documents a benign neoplasm of the central nervous system and does not name the exact structure. It is appropriate when imaging, pathology, or operative notes confirm benign behavior but the location remains nonspecific. Check documentation if the lesion is later described more precisely.
Do not use for
Do not use this code for malignant, uncertain, or metastatic tumors. If the documentation identifies a specific CNS site, choose the more specific benign neoplasm code instead.
Coding tip
Query for the exact CNS location whenever possible, because D33.9 is only for unspecified benign central nervous system neoplasms.