Aseptic meningitis in leptospirosis

This code signifies the presence of aseptic meningitis specifically caused by a leptospiral infection. Aseptic meningitis refers to inflammation of the meninges without bacterial growth in cerebrospinal fluid cultures, while leptospirosis is a bacterial zoonotic disease.

Apply this code when documentation confirms a diagnosis of meningitis, characterized by sterile CSF cultures, and laboratory evidence (e.g., serology, PCR) or strong epidemiological links establish leptospirosis as the causative agent. This code is appropriate for patients presenting with meningeal symptoms during the course of a leptospiral infection.

• Always ensure documentation clearly links the aseptic meningitis to leptospirosis; "meningitis due to leptospirosis" or similar phrasing is ideal.
• Do not confuse with bacterial meningitis (G00.-) or other specified nonbacterial meningitis (G03.0).
• Code the underlying leptospirosis (A27.-) as the primary diagnosis if the meningitis is a manifestation of a systemic leptospiral infection.