ICD-9 Diagnosis Code 323.51

Enceph/myel folwg immune

Diagnosis Code 323.51

ICD-9: 323.51
Short Description: Enceph/myel folwg immune
Long Description: Encephalitis and encephalomyelitis following immunization procedures
This is the 2014 version of the ICD-9-CM diagnosis code 323.51

Code Classification
  • Diseases of the nervous system (320–359)
    • 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.

  • Post cholera vaccination encephalitis
  • Post diphtheria vaccination encephalitis
  • Post hepatitis A vaccination encephalitis
  • Post hepatitis B vaccination encephalitis
  • Post influenza vaccination encephalitis
  • Post measles vaccination encephalitis
  • Post mixed vaccination encephalitis
  • Post mumps vaccination encephalitis
  • Post paratyphoid vaccination encephalitis
  • Post pertussis vaccination encephalitis
  • Post plague vaccination encephalitis
  • Post polio vaccination encephalitis
  • Post rabies vaccination encephalitis
  • Post rubella vaccination encephalitis
  • Post smallpox vaccination encephalitis
  • Post tetanus vaccination encephalitis
  • Post typhoid vaccination encephalitis
  • Post typhus vaccination encephalitis
  • Post yellow fever vaccination encephalitis
  • Post-bacillus Calmette-Guerin vaccination encephalitis
  • Post-immunization encephalitis
  • Postvaccinal encephalomyelitis

Index of Diseases and Injuries
References found for the code 323.51 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

[Read More]


Also called: Vaccination

Shots may hurt a little, but the diseases they can prevent are a lot worse. Some are even life-threatening. Immunization shots, or vaccinations, are essential. They protect against things like measles, mumps, rubella, hepatitis B, polio, diphtheria, tetanus, and pertussis (whooping cough). Immunizations are important for adults as well as children.

Your immune system helps your body fight germs by producing substances to combat them. Once it does, the immune system "remembers" the germ and can fight it again. Vaccines contain germs that have been killed or weakened. When given to a healthy person, the vaccine triggers the immune system to respond and thus build immunity.

Before vaccines, people became immune only by actually getting a disease and surviving it. Immunizations are an easier and less risky way to become immune.

NIH: National Institute of Allergy and Infectious Diseases

  • Immunizations - diabetes

[Read More]
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