ICD-10 Code D33.1 – Benign neoplasm of brain, infratentorial (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D33.1 – Benign neoplasm of brain, infratentorial
What it is
This code identifies a noncancerous tumor located in the infratentorial portion of the brain, which includes the cerebellum and brainstem region. It is used when the lesion is documented as benign and intracranial.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include headaches, gait disturbance, dizziness, nausea, or cranial nerve-related deficits depending on the tumor’s size and location.
When to use this code
Use D33.1 when the provider documents a benign neoplasm arising in the infratentorial brain, such as the cerebellum or brainstem area. This code fits imaging, pathology, or specialist notes that clearly identify the lesion as benign. Check documentation if the record only says “brain tumor” or does not specify location.
Do not use for
Do not use this code for malignant brain tumors, metastatic disease, or neoplasms outside the infratentorial region. If the diagnosis is uncertain or not confirmed as benign, check documentation.
Coding tip
Confirm both the benign nature and the infratentorial site before assigning D33.1.