ICD-10 Diagnosis Code G04.81

Other encephalitis and encephalomyelitis

Diagnosis Code G04.81

ICD-10: G04.81
Short Description: Other encephalitis and encephalomyelitis
Long Description: Other encephalitis and encephalomyelitis
This is the 2018 version of the ICD-10-CM diagnosis code G04.81

Valid for Submission
The code G04.81 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the nervous system (G00–G99)
    • Inflammatory diseases of the central nervous system (G00-G09)
      • Encephalitis, myelitis and encephalomyelitis (G04)

Information for Medical Professionals

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Allergic encephalitis
  • Allergic encephalitis
  • Allergic encephalomyelitis
  • Autoimmune encephalitis
  • Bickerstaff's brainstem encephalitis
  • Brainstem encephalitis
  • Encephalitis caused by Herpesvirus
  • Experimental allergic encephalomyelitis
  • Focal encephalitis
  • Granulomatous meningoencephalomyelitis
  • Infectious mononucleosis
  • Infectious mononucleosis encephalitis
  • Limbic encephalitis
  • Meningoencephalomyelitis
  • Meningoencephalomyelitis
  • Meningomyelitis
  • Meningomyelitis
  • Pyogranulomatous meningoencephalomyelitis
  • Rasmussen syndrome
  • Rasmussen syndrome, refractory

Index of Diseases and Injuries
References found for the code G04.81 in the Index of Diseases and Injuries:

Information for Patients


Encephalitis is an inflammation of the brain. Usually the cause is a viral infection, but bacteria can also cause it. It can be mild or severe. Most cases are mild. You may have flu-like symptoms. With a mild case, you may just need rest, plenty of fluids, and a pain reliever.

Severe cases need immediate treatment. Symptoms of severe cases include

  • Severe headache
  • Sudden fever
  • Drowsiness
  • Vomiting
  • Confusion
  • Seizures

In babies, additional symptoms may include constant crying, poor feeding, body stiffness, and bulging in the soft spots of the skull.

Severe cases may require a stay in the hospital. Treatments include oral and intravenous (IV) medicines to reduce inflammation and treat infection. Patients with breathing difficulties may need artificial respiration. Some people may need physical, speech, and occupational therapy once the illness is under control.

NIH: National Institute of Neurological Disorders and Stroke

  • Cerebral spinal fluid (CSF) collection (Medical Encyclopedia)
  • CSF analysis (Medical Encyclopedia)
  • Encephalitis (Medical Encyclopedia)
  • Japanese Encephalitis Vaccine: What You Need to Know (Centers for Disease Control and Prevention)
  • Subacute sclerosing panencephalitis (Medical Encyclopedia)

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