ICD-10 Diagnosis Code B00.4

Herpesviral encephalitis

Diagnosis Code B00.4

ICD-10: B00.4
Short Description: Herpesviral encephalitis
Long Description: Herpesviral encephalitis
This is the 2017 version of the ICD-10-CM diagnosis code B00.4

Code Classification
  • Certain infectious and parasitic diseases
    • Viral infections characterized by skin and mucous membrane lesions (B00-B09)
      • Herpesviral [herpes simplex] infections (B00)

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.

  • Acute necrotizing encephalitis
  • Acute viral encephalitis
  • Encephalitis caused by Herpesvirus
  • Encephalitis caused by human herpes simplex virus
  • Herpes simiae encephalitis
  • Herpetic acute necrotizing encephalitis
  • Herpetic meningoencephalitis
  • Simian B disease
  • Simian B encephalomyelitis
  • Viral meningoencephalitis

Index of Diseases and Injuries
References found for the code B00.4 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
  • CSF analysis
  • Encephalitis
  • Japanese Encephalitis Vaccine: What You Need to Know (Centers for Disease Control and Prevention)
  • Subacute sclerosing panencephalitis

[Read More]

Herpes Simplex

Also called: HSV

Herpes is an infection that is caused by a herpes simplex virus (HSV). Oral herpes causes cold sores around the mouth or face. Genital herpes affects the genitals, buttocks or anal area. Genital herpes is a sexually transmitted disease (STD). It affects the genitals, buttocks or anal area. Other herpes infections can affect the eyes, skin, or other parts of the body. The virus can be dangerous in newborn babies or in people with weak immune systems.

There are two types of HSV:

  • HSV type 1 most commonly causes cold sores. It can also cause genital herpes.
  • HSV type 2 is the usual cause of genital herpes, but it also can infect the mouth.

HSV spreads through direct contact. Some people have no symptoms. Others get sores near the area where the virus has entered the body. They turn into blisters, become itchy and painful, and then heal.

Most people have outbreaks several times a year. Over time, you get them less often. Medicines to help your body fight the virus can help lessen symptoms and decrease outbreaks.

  • Esophagitis - infectious
  • Herpes viral culture of lesion
  • Serum herpes simplex antibodies

[Read More]
Previous Code
Previous Code B00.3
Next Code
B00.5 Next Code