Tuberculous meningitis

This code represents an infection of the meninges (the membranes surrounding the brain and spinal cord) caused by Mycobacterium tuberculosis. It is a severe form of extrapulmonary tuberculosis that can lead to significant neurological complications if not promptly treated.

Use this code when documentation clearly states a diagnosis of tuberculous meningitis, often confirmed by cerebrospinal fluid (CSF) analysis showing acid-fast bacilli or positive M. tuberculosis culture. This diagnosis is typically made in patients presenting with fever, headache, neck stiffness, and altered mental status, with a history of tuberculosis exposure or active disease.

• Do not code this with tuberculous meningoencephalitis (A17.82) as per the Excludes1 note; these are distinct conditions.
• Always look for documentation of the causative organism (Mycobacterium tuberculosis) to support this specific diagnosis.
• Consider sequencing this code as the primary diagnosis if it is the reason for the patient's admission or encounter.