ICD-10 Code G96.81 – Intracranial hypotension (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G96.81 – Intracranial hypotension
What it is
G96.81 identifies low pressure of the cerebrospinal fluid around the brain and spinal cord. It is used when documentation supports intracranial hypotension, often from a CSF leak or reduced CSF volume.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include an orthostatic headache that worsens upright and improves when lying down, sometimes with nausea, neck pain, or hearing changes.
When to use this code
Use this code when the provider documents intracranial hypotension, low CSF pressure, or a confirmed CSF leak causing the condition. It may appear in postoperative, spontaneous, or trauma-related contexts if the record supports the diagnosis. Code the documented condition, not just headache alone.
Do not use for
Do not use G96.81 for nonspecific headache, migraine, or dizziness without documentation of intracranial hypotension. Check documentation if the chart only mentions suspected low pressure or an unrelated neurologic disorder.
Coding tip
Query for the underlying cause, because the leak or procedure-related source may need separate coding when documented.