ICD-10-CM Code B01

Varicella [chickenpox]

Version 2021 Non-Billable Code

Not Valid for Submission

B01 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of varicella [chickenpox]. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions.

Short Description:Varicella [chickenpox]
Long Description:Varicella [chickenpox]

Consider the following ICD-10 codes with a higher level of specificity:

  • B01.0 - Varicella meningitis
  • B01.1 - Varicella encephalitis, myelitis and encephalomyelitis
  • B01.11 - Varicella encephalitis and encephalomyelitis
  • B01.12 - Varicella myelitis
  • B01.2 - Varicella pneumonia
  • B01.8 - Varicella with other complications
  • B01.81 - Varicella keratitis
  • B01.89 - Other varicella complications
  • B01.9 - Varicella without complication

Clinical Information

  • VARICELLA ZOSTER VIRUS INFECTION-. infection caused by human herpes virus 3 e.g. chickenpox and herpes zoster.
  • CHICKENPOX-. a highly contagious infectious disease caused by the varicella zoster virus herpesvirus 3 human. it usually affects children is spread by direct contact or respiratory route via droplet nuclei and is characterized by the appearance on the skin and mucous membranes of successive crops of typical pruritic vesicular lesions that are easily broken and become scabbed. chickenpox is relatively benign in children but may be complicated by pneumonia and encephalitis in adults. from dorland 27th ed
  • HERPESVIRUS 3 HUMAN-. the type species of varicellovirus causing chickenpox varicella and herpes zoster shingles in humans.
  • CHICKENPOX VACCINE-. a live attenuated varicella virus vaccine used for immunization against chickenpox. it is recommended for children between the ages of 12 months and 13 years.
  • ENCEPHALITIS VARICELLA ZOSTER-. inflammation of brain tissue caused by infection with the varicella zoster virus herpesvirus 3 human. this condition is associated with immunocompromised states including the acquired immunodeficiency syndrome. pathologically the virus tends to induce a vasculopathy and infect oligodendrocytes and ependymal cells leading to cerebral infarction multifocal regions of demyelination and periventricular necrosis. manifestations of varicella encephalitis usually occur 5 7 days after onset of herpes zoster and include headache; vomiting; lethargy; focal neurologic deficits; fever; and coma. from joynt clinical neurology 1996 ch 26 pp29 32; hum pathol 1996 sep;279:927 38

Code Classification

  • Certain infectious and parasitic diseases (A00–B99)
    • Viral infections characterized by skin and mucous membrane lesions (B00-B09)
      • Varicella [chickenpox] (B01)

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
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Also called: Varicella

Chickenpox is an infection caused by the varicella-zoster virus. Most cases are in children under age 15, but older children and adults can get it. It spreads very easily from one person to another.

The classic symptom of chickenpox is an uncomfortable, itchy rash. The rash turns into fluid-filled blisters and eventually into scabs. It usually shows up on the face, chest, and back and then spreads to the rest of the body. Other symptoms include

  • Fever
  • Headache
  • Tiredness
  • Loss of appetite

Chickenpox is usually mild and lasts 5 to 10 days. Calamine lotions and oatmeal baths can help with itching. Acetaminophen can treat the fever. Do not use aspirin for chickenpox; that combination can cause Reye syndrome.

Chickenpox can sometimes cause serious problems. Adults, babies, teenagers, pregnant women, and those with weak immune systems tend to get sicker from it. They may need to take antiviral medicines.

Once you catch chickenpox, the virus usually stays in your body. You probably will not get chickenpox again, but the virus can cause shingles in adults. A chickenpox vaccine can help prevent most cases of chickenpox, or make it less severe if you do get it.

Centers for Disease Control and Prevention

  • Chickenpox (Medical Encyclopedia)
  • Chickenpox Vaccine: What You Need to Know (Centers for Disease Control and Prevention)
  • MMRV (Measles, Mumps, Rubella, and Varicella) Vaccine: What You Need to Know (Centers for Disease Control and Prevention)

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