2021 ICD-10-CM Diagnosis Code B02.0

Zoster encephalitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • B02.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM B02.0 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of B02.0 - other international versions of ICD-10 B02.0 may differ.
Applicable To
  • Zoster meningoencephalitis
The following code(s) above B02.0 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 B02.0:
  • A00-B99
    2021 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • carrier or suspected carrier of infectious disease (Z22.-)
    • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
    • infectious and parasitic diseases specific to the perinatal period (P35-P39)
    • influenza and other acute respiratory infections (J00-J22)
    Use Additional
    • code to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
  • B02
    ICD-10-CM Diagnosis Code B02

    Zoster [herpes zoster]

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    • shingles
    • zona
    Zoster [herpes zoster]
Approximate Synonyms
  • Herpes zoster encephalitis
Clinical Information
  • 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)
ICD-10-CM B02.0 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 073 Cranial and peripheral nerve disorders with mcc
  • 074 Cranial and peripheral nerve disorders without mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert B02.0 to ICD-9-CM

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 B02.0:
  • Type 1 Excludes: A85
    , G05
    ICD-10-CM Diagnosis Code A85

    Other viral encephalitis, not elsewhere classified

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    • specified viral encephalomyelitis NEC
    • specified viral meningoencephalitis NEC
    Type 1 Excludes
    • benign myalgic encephalomyelitis (G93.3)
    • encephalitis due to cytomegalovirus (B25.8)
    • encephalitis due to herpesvirus NEC (B10.0-)
    • encephalitis due to herpesvirus [herpes simplex] (B00.4)
    • encephalitis due to measles virus (B05.0)
    • encephalitis due to mumps virus (B26.2)
    • encephalitis due to poliomyelitis virus (A80.-)
    • encephalitis due to zoster (B02.0)
    • lymphocytic choriomeningitis (A87.2)
    ICD-10-CM Diagnosis Code G05

    Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 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)

Diagnosis Index entries containing back-references to B02.0:
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) G04.90
    ICD-10-CM Diagnosis Code G04.90

    Encephalitis and encephalomyelitis, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Ventriculitis (cerebral) NOS
    • in (due to)
      • zoster B02.0
    • herpes zoster B02.0
  • Herpes, herpesvirus, herpetic B00.9
    ICD-10-CM Diagnosis Code B00.9

    Herpesviral infection, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Herpes simplex infection NOS
    • zoster B02.9
      - see also condition
      ICD-10-CM Diagnosis Code B02.9

      Zoster without complications

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      Applicable To
      • Zoster NOS
      • encephalitis B02.0

ICD-10-CM Codes Adjacent To B02.0
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
B02 Zoster [herpes zoster]
B02.0 Zoster encephalitis
B02.1 Zoster meningitis
B02.2 Zoster with other nervous system involvement
B02.21 Postherpetic geniculate ganglionitis
B02.22 Postherpetic trigeminal neuralgia
B02.23 Postherpetic polyneuropathy
B02.24 Postherpetic myelitis
B02.29 Other postherpetic nervous system involvement
B02.3 Zoster ocular disease
B02.30 …… unspecified
B02.31 Zoster conjunctivitis

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