ICD-10-CM Code G04.90

Encephalitis and encephalomyelitis, unspecified

Version 2020 Billable Code

Valid for Submission

G04.90 is a billable code used to specify a medical diagnosis of encephalitis and encephalomyelitis, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code G04.90 might also be used to specify conditions or terms like bacterial ventriculitis, brainstem encephalitis, encephalitis, encephalitis, myelitis and encephalomyelitis, encephalomyelitis, ependymitis, etc

ICD-10:G04.90
Short Description:Encephalitis and encephalomyelitis, unspecified
Long Description:Encephalitis and encephalomyelitis, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code G04.90:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Ventriculitis (cerebral) NOS

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G04.90 are found in the index:


Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Bacterial ventriculitis
  • Brainstem encephalitis
  • Encephalitis
  • Encephalitis, myelitis and encephalomyelitis
  • Encephalomyelitis
  • Ependymitis
  • Focal encephalitis
  • Granular ependymitis
  • Infection causing encephalomyelitis
  • Infection causing myelitis
  • Infection due to Mycoplasma pneumoniae
  • Infectious disease of brain
  • Infective encephalitis
  • Infective ventriculitis
  • Infective ventriculitis
  • Malignant ventriculitis
  • Meningoencephalitis
  • Meningoencephalomyelitis
  • Meningomyelitis
  • Mycoplasma pneumoniae encephalitis
  • Primary encephalitis
  • Seizures complicating infection
  • Situation-related seizures
  • Ventriculitis of the brain
  • Ventriculitis of the brain
  • Ventriculitis of the brain

Convert G04.90 to ICD-9

  • 323.9 - Encephalitis NOS (Approximate Flag)

Code Classification

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

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Encephalitis

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


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Spinal Cord Diseases

Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine. If you have an accident that damages the vertebrae or other parts of the spine, this can also injure the spinal cord. Other spinal cord problems include

  • Tumors
  • Infections such as meningitis and polio
  • Inflammatory diseases
  • Autoimmune diseases
  • Degenerative diseases such as amyotrophic lateral sclerosis and spinal muscular atrophy

Symptoms vary but might include pain, numbness, loss of sensation and muscle weakness. These symptoms can occur around the spinal cord, and also in other areas such as your arms and legs. Treatments often include medicines and surgery.


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