ICD-10 Code A87.9 – Viral meningitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A87.9 – Viral meningitis, unspecified
What it is
A87.9 identifies viral meningitis when the causative virus is not specified in the record. It means inflammation of the meninges is documented, but the provider has not named a specific viral agent.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include headache, fever, neck stiffness, photophobia, and symptoms of meningeal irritation, but the chart must support a viral cause without naming the organism.
When to use this code
Use A87.9 when the provider diagnoses viral meningitis and does not identify the virus. It also fits when the note states “viral meningitis” or “aseptic meningitis” without a more specific codeable cause. If the organism is named, code the more specific diagnosis instead.
Do not use for
Do not use this code for bacterial, fungal, or parasitic meningitis. Do not use it when documentation supports a specific viral infection or another neurologic condition instead. Check documentation.
Coding tip
Confirm that the record clearly supports meningitis and a viral etiology before assigning A87.9.