ICD-9 Diagnosis Code 323.81

Enceph & encephlalo NEC

Diagnosis Code 323.81

ICD-9: 323.81
Short Description: Enceph & encephlalo NEC
Long Description: Other causes of encephalitis and encephalomyelitis
This is the 2014 version of the ICD-9-CM diagnosis code 323.81

Code Classification
  • Diseases of the nervous system
    • Inflammatory diseases of the central nervous system (320-327)
      • 323 Encephalitis, myelitis, and encephalomyelitis

Information for Medical Professionals

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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 encephalomyelitis
  • Autoimmune encephalitis
  • Bickerstaff's brainstem encephalitis
  • Eosinophilic meningoencephalitis
  • Eosinophilic meningoencephalitis due to Angiostrongylus cantonensis
  • Experimental allergic encephalomyelitis
  • Hereditary diffuse leukoencephalopathy with spheroids
  • Inflammation of brain and spinal cord due to toxic substance
  • Jamestown Canyon virus encephalitis
  • Paraneoplastic encephalitis
  • Paraneoplastic encephalomyelitis
  • Paraneoplastic limbic encephalitis
  • Pyogranulomatous meningoencephalomyelitis
  • Systemic lupus erythematosus encephalitis

Index of Diseases and Injuries
References found for the code 323.81 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 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
  • CSF analysis
  • Encephalitis
  • Japanese Encephalitis Vaccine: What You Need to Know (Centers for Disease Control and Prevention)
  • Subacute sclerosing panencephalitis

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