ICD-10 Code A87.1 – Adenoviral meningitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A87.1 – Adenoviral meningitis
What it is
A87.1 identifies meningitis caused by adenovirus. Use it when documentation states adenoviral infection involving the meninges, not a nonspecific viral meningitis.
Clinical signs
Clinical features vary; refer to documentation. Typical meningitis findings may include headache, fever, neck stiffness, photophobia, or altered mental status, with adenovirus confirmed or strongly linked in the record.
When to use this code
Use A87.1 when the provider documents adenoviral meningitis or clearly attributes meningitis to adenovirus. It also fits cases where the diagnosis is confirmed by clinical assessment and supporting testing in the chart. If the organism is not specified, check documentation before assigning this code.
Do not use for
Do not use this code for meningitis due to other viruses, bacteria, fungi, or noninfectious causes. If the record only says “viral meningitis” without adenovirus, code the unspecified viral meningitis instead.
Coding tip
Confirm the causative organism in the provider’s final diagnosis or assessment before coding A87.1.