ICD-10 Code A27.81 – Aseptic meningitis in leptospirosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A27.81 – Aseptic meningitis in leptospirosis
What it is
A27.81 identifies aseptic meningitis caused by leptospirosis, a leptospiral infection affecting the meninges without typical bacterial growth in cerebrospinal fluid. Use it when the chart clearly links meningitis to leptospirosis.
Clinical signs
Patients may have headache, neck stiffness, fever, and other meningeal irritation findings. Clinical features vary; refer to documentation for evidence of leptospiral infection and meningitis.
When to use this code
Use this code when the provider documents aseptic meningitis due to leptospirosis or records leptospiral meningitis. It may also apply when the final diagnosis states leptospirosis with meningeal involvement. If the cause is not specified, check documentation.
Do not use for
Do not use this code for meningitis from other infectious or noninfectious causes. Do not assign it when leptospirosis is present without documented meningitis.
Coding tip
Code the confirmed causal relationship only when the record supports leptospirosis as the cause of meningitis.