Unspecified viral infection of central nervous system (A89)

The ICD-10 code A89 is used to classify cases of an unspecified viral infection of the central nervous system (CNS). This code is applied when a viral CNS infection is confirmed but the specific virus has not been identified.

This code covers a broad category often referred to as viral infection of central nervous system, which may include various viral causes that affect the brain and spinal cord. The term "unspecified" indicates that while the infection involves the CNS, the exact viral agent; such as herpesvirus, enterovirus, or others; is not determined. For medical coders and healthcare professionals, using the ICD-10 code A89 ensures accurate documentation when a viral CNS infection is present, but further specificity is unavailable. This code is particularly important for reporting and tracking infections that impact critical neurological functions without an identified viral type.