1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. B00-B09 Viral infections characterized by skin and mucous membrane lesions
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4. B01- Varicella [chickenpox]
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5. 2020 ICD-10-CM Diagnosis Code B01.1

2020 ICD-10-CM Diagnosis Code B01.1

Varicella encephalitis, myelitis and encephalomyelitis

2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code

• B01.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• The 2020 edition of ICD-10-CM B01.1 became effective on October 1, 2019.
• This is the American ICD-10-CM version of B01.1 - other international versions of ICD-10 B01.1 may differ.

• 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;27(9):927-38)

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change

• Type 1 Excludes: G04.01
  , G05
  ICD-10-CM Diagnosis Code G04.01

  Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

  2016 2017 2018 2019 2020 Billable/Specific Code

  Type 1 Excludes

  • post chickenpox encephalitis (B01.1)
  • post measles encephalitis (B05.0)
  • post measles myelitis (B05.1)
  ICD-10-CM Diagnosis Code G05

  Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

  2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code

  Code First

  • underlying disease, such as:
  • human immunodeficiency virus [HIV] disease (B20)
  • poliovirus (A80.-)
  • suppurative otitis media (H66.01-H66.4)
  • trichinellosis (B75)

  Type 1 Excludes

  • adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
  • congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
  • cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
  • encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
  • encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
  • enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
  • eosinophilic meningoencephalitis (B83.2)
  • herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
  • listerial encephalitis, myelitis and encephalomyelitis (A32.12)
  • meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
  • mumps encephalitis, myelitis and encephalomyelitis (B26.2)
  • postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
  • rubella encephalitis, myelitis and encephalomyelitis (B06.01)
  • toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
  • zoster encephalitis, myelitis and encephalomyelitis (B02.0)

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.