ICD-10 Code G04.2 – Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G04.2 – Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
What it is
G04.2 identifies bacterial inflammation affecting both the brain and spinal cord membranes or tissue, without a more specific classified cause. Use it when the record documents bacterial meningoencephalitis, meningomyelitis, or both.
Clinical signs
Typical findings may include fever, headache, neck stiffness, altered mental status, seizures, or focal neurologic deficits. Clinical features vary; refer to documentation and supporting neurologic or infectious disease assessment.
When to use this code
Use this code when the provider clearly documents bacterial meningoencephalitis or bacterial meningomyelitis and no more specific organism or category is available. It may also fit cases described as bacterial involvement of both brain and spinal cord. Check documentation if the condition is only suspected.
Do not use for
Do not use this code for viral, fungal, parasitic, or noninfectious encephalitis or myelitis. Avoid it when the chart identifies a more specific bacterial cause or a different neurologic diagnosis.
Coding tip
Code to the highest documented specificity, and query for the organism or exact syndrome when the note is vague.