Meningitis, unspecified

This code represents an inflammatory condition affecting the meninges, the protective membranes surrounding the brain and spinal cord, when the specific cause or type of meningitis has not been identified. It indicates a diagnosis of meningitis without further specification of its etiology (e.g., bacterial, viral, fungal).

Use this code when the medical record clearly documents a diagnosis of meningitis, but the physician has not specified the underlying cause or type. This is often an initial diagnosis when diagnostic workup (e.g., CSF analysis, cultures) is pending or inconclusive, or when the specific pathogen is never identified.

• Avoid using this code if a more specific type of meningitis (e.g., bacterial, viral) is documented; always code to the highest level of specificity.
• Review the entire medical record for any clues regarding the etiology of meningitis, such as positive cultures or specific viral panel results.
• If the cause is later identified, update the diagnosis to the more specific code.