G04.0
Acute disseminated encephalitis and encephalomyelitis (ADEM)
Clinical Classification Guidelines
Excludes Type 1
- acute necrotizing hemorrhagic encephalopathy (G04.3-)
- other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)
Medical Intelligence & Overview
Acute disseminated encephalitis and encephalomyelitis, commonly known as ADEM, is a rare neurological condition characterized by sudden inflammation of the brain and spinal cord. This inflammation leads to symptoms that can develop quickly and may affect multiple parts of the central nervous system. Typically, ADEM follows infections or, less commonly, vaccinations, and requires prompt medical attention to manage symptoms and prevent complications.
Causes & Symptoms
Clinical Causes: Recent viral infections, such as measles, chickenpox, mumps, or influenza Recent bacterial infections, including Lyme disease or other bacterial illnesses Recent vaccination, especially certain childhood vaccines Immune system response that mistakenly attacks your brain and spinal cord tissues
Key Symptoms: Sudden onset of fever and headache Weakness or numbness in limbs Altered consciousness or drowsiness Loss of coordination and balance issues Visual disturbances, such as blurred vision or double vision Seizures in some cases Difficulty speaking or understanding speech Behavioral changes or confusion Neck stiffness
Diagnostic & Treatment
Diagnosis Path: Magnetic Resonance Imaging (MRI) of the brain and spinal cord to detect inflammation and lesions Lumbar puncture (spinal tap) to analyze cerebrospinal fluid for inflammation markers and rule out infections Blood tests to identify recent infections or immune responses Electroencephalogram (EEG) if seizure activity is suspected
Treatment Protocols: High-dose corticosteroids, such as methylprednisolone, administered intravenously to decrease brain inflammation Immunoglobulin therapy (IVIG) to modulate immune response Plasmapheresis in severe cases where steroids and IVIG are ineffective Supportive care, including physical therapy to address neurological deficits Symptom management, such as anticonvulsants for seizures or medications for pain
Clinical Advice & FAQs
Billing Guidance
Is G04.0 a billable ICD-10 code?
Yes, G04.0 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report G04.0?
Clinical documentation must specify the nature of Acute disseminated encephalitis and encephalomyelitis (ADEM) and any associated comorbidities for accurate reporting.
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