ICD-10-CM Code B00.4

Herpesviral encephalitis

Version 2020 Billable Code

Valid for Submission

B00.4 is a billable code used to specify a medical diagnosis of herpesviral encephalitis. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code B00.4 might also be used to specify conditions or terms like acute necrotizing encephalitis, acute viral encephalitis, dementia associated with viral encephalitis, dementia due to herpes encephalitis, dementia due to infectious disease, encephalitis due to herpesviridae, etc

ICD-10:B00.4
Short Description:Herpesviral encephalitis
Long Description:Herpesviral encephalitis

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 B00.4:

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.
  • Herpesviral meningoencephalitis
  • Simian B disease

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • herpesviral encephalitis due to herpesvirus 6 and 7 B10.01 B10.09
  • non-simplex herpesviral encephalitis B10.0

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 B00.4 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:

  • Acute necrotizing encephalitis
  • Acute viral encephalitis
  • Dementia associated with viral encephalitis
  • Dementia due to herpes encephalitis
  • Dementia due to infectious disease
  • Encephalitis due to Herpesviridae
  • Encephalitis due to human herpes simplex virus
  • Herpes simiae encephalitis
  • Herpes simplex meningitis
  • Herpetic acute necrotizing encephalitis
  • Herpetic meningoencephalitis
  • Infection of central nervous system caused by Herpes simplex virus
  • Infection of central nervous system caused by Herpes simplex virus
  • Simian B disease
  • Simian B encephalomyelitis
  • Viral meningoencephalitis

Convert B00.4 to ICD-9

  • 054.3 - Herpetic encephalitis (Approximate Flag)

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Viral infections characterized by skin and mucous membrane lesions (B00-B09)
      • Herpesviral [herpes simplex] infections (B00)

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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Herpes Simplex

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.


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