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ICD-10-CM Codes
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A00-B99
Certain infectious and parasitic diseases
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B00-B09
Viral infections characterized by skin and mucous membrane lesions
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B01-
Varicella [chickenpox]
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2021 ICD-10-CM Diagnosis Code B01.1
2021 ICD-10-CM Diagnosis Code B01.1
Varicella encephalitis, myelitis and encephalomyelitis
2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM B01.1 became effective on October 1, 2020.
- This is the American ICD-10-CM version of B01.1 - other international versions of ICD-10 B01.1 may differ.
Applicable To- Postchickenpox encephalitis, myelitis and encephalomyelitis
The following code(s) above
B01.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
B01.1:
- 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)
Code History
- 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
- 2021 (effective 10/1/2020): No change
Code annotations containing back-references to B01.1:
ICD-10-CM Codes Adjacent To B01.1
B00.53 Herpesviral conjunctivitis
B00.59 Other herpesviral disease of eye
B00.7 Disseminated herpesviral disease
B00.8 Other forms of herpesviral infections
B00.82 Herpes simplex myelitis
B00.89 Other herpesviral infection
B00.9 Herpesviral infection, unspecified
B01 Varicella [chickenpox]
B01.0 Varicella meningitis
B01.1
Varicella encephalitis, myelitis and encephalomyelitis
B01.11 Varicella encephalitis and encephalomyelitis
B01.2 Varicella pneumonia
B01.8 Varicella with other complications
B01.89 Other varicella complications
B01.9 Varicella without complication
B02 Zoster [herpes zoster]
B02.0 Zoster encephalitis
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
