G04.01
Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
Clinical Classification Guidelines
Excludes Type 1
- post chickenpox encephalitis (B01.1)
- post measles encephalitis (B05.0)
- post measles myelitis (B05.1)
Medical Intelligence & Overview
Postinfectious acute disseminated encephalomyelitis (ADEM) is a rare neurological condition that affects the brain and spinal cord. Often triggered by an infection, ADEM causes inflammation and damage to the protective covering of nerve fibers, leading to a quick onset of neurological symptoms. While it can develop after various infections, most cases are linked to recent illnesses. Recognizing and understanding this condition is important for early intervention and management.
Causes & Symptoms
Clinical Causes: Viral infections, such as measles, mumps, rubella, herpes simplex, and influenza. Bacterial infections, including certain types of pneumonia or meningitis. Recent vaccination, particularly with vaccines for measles or influenza, although this is rare. Immune system response to infection that mistakenly attacks the brain and spinal cord tissues. Other autoimmune conditions that may predispose to inflammation of the central nervous system.
Key Symptoms: Rapid onset of neurological changes that may develop over hours to days. Fever and fatigue often accompany neurological deficits. Weakness or paralysis in limbs or facial muscles. Loss of coordination, balance issues, and difficulty walking. Headache, confusion, and altered mental status. Seizures in some cases. Visual disturbances or blurred vision.
Diagnostic & Treatment
Diagnosis Path: Diagnosis involves a comprehensive medical evaluation including a detailed history and neurological exam. Doctors may employ various tests such as:
Treatment Protocols: Treatment typically focuses on reducing inflammation and managing symptoms. Common approaches include:
Clinical Advice & FAQs
Billing Guidance
Is G04.01 a billable ICD-10 code?
Yes, G04.01 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report G04.01?
Clinical documentation must specify the nature of Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) and any associated comorbidities for accurate reporting.
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