1. 2023 ICD-10-CM Index
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2. 'M' Terms
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3. Index Terms Starting With 'M' (Meningoencephalitis)

Index Terms Starting With 'M' (Meningoencephalitis)

• Meningoencephalitis G04.90

  - see also Encephalitis

  ICD-10-CM Diagnosis Code G04.90

  Encephalitis and encephalomyelitis, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Applicable To

  • Ventriculitis (cerebral) NOS

  • acute NEC A86
    - see also Encephalitis, viral
    ICD-10-CM Diagnosis Code A86

    Unspecified viral encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Viral encephalomyelitis NOS
    • Viral meningoencephalitis NOS
  • bacterial NEC G04.2
    ICD-10-CM Diagnosis Code G04.2

    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • California A83.5
    ICD-10-CM Diagnosis Code A83.5

    California encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • California meningoencephalitis
    • La Crosse encephalitis
  • diphasic A84.1
    ICD-10-CM Diagnosis Code A84.1

    Central European tick-borne encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • eosinophilic B83.2
    ICD-10-CM Diagnosis Code B83.2

    Angiostrongyliasis due to Parastrongylus cantonensis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Eosinophilic meningoencephalitis due to Parastrongylus cantonensis

    Type 2 Excludes

    • intestinal angiostrongyliasis (B81.3)
  • epidemic A39.81
    ICD-10-CM Diagnosis Code A39.81

    Meningococcal encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • herpesviral, herpetic B00.4
    ICD-10-CM Diagnosis Code B00.4

    Herpesviral encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Herpesviral meningoencephalitis
    • Simian B disease

    Type 1 Excludes

    • herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
    • non-simplex herpesviral encephalitis (B10.0-)
    • due to herpesvirus 6 B10.01
      ICD-10-CM Diagnosis Code B10.01

      Human herpesvirus 6 encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    • due to herpesvirus 7 B10.09
      ICD-10-CM Diagnosis Code B10.09

      Other human herpesvirus encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Human herpesvirus 7 encephalitis
    • specified NEC B10.09
      ICD-10-CM Diagnosis Code B10.09

      Other human herpesvirus encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Human herpesvirus 7 encephalitis
  • in (due to)
    • blastomycosis NEC B40.81
      ICD-10-CM Diagnosis Code B40.81

      Blastomycotic meningoencephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Meningomyelitis due to blastomycosis
    • diseases classified elsewhere G05.3
      ICD-10-CM Diagnosis Code G05.3

      Encephalitis and encephalomyelitis in diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Manifestation Code

      Applicable To

      • Meningoencephalitis in diseases classified elsewhere
    • free-living amebae B60.2
      ICD-10-CM Diagnosis Code B60.2

      Naegleriasis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Primary amebic meningoencephalitis
    • H. influenzae G00.0
      ICD-10-CM Diagnosis Code G00.0

      Hemophilus meningitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Meningitis due to Hemophilus influenzae
    • Hemophilus influenzae G00.0
      (H .influenzae)
      ICD-10-CM Diagnosis Code G00.0

      Hemophilus meningitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Meningitis due to Hemophilus influenzae
    • herpes B00.4
      ICD-10-CM Diagnosis Code B00.4

      Herpesviral encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Herpesviral meningoencephalitis
      • Simian B disease

      Type 1 Excludes

      • herpesviral encephalitis due to herpesvirus 6 and 7 (B10.01, B10.09)
      • non-simplex herpesviral encephalitis (B10.0-)
      • due to herpesvirus 6 B10.01
        ICD-10-CM Diagnosis Code B10.01

        Human herpesvirus 6 encephalitis

        2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
      • due to herpesvirus 7 B10.09
        ICD-10-CM Diagnosis Code B10.09

        Other human herpesvirus encephalitis

        2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

        Applicable To

        • Human herpesvirus 7 encephalitis
      • specified NEC B10.09
        ICD-10-CM Diagnosis Code B10.09

        Other human herpesvirus encephalitis

        2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

        Applicable To

        • Human herpesvirus 7 encephalitis
    • Lyme disease A69.22
      ICD-10-CM Diagnosis Code A69.22

      Other neurologic disorders in Lyme disease

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Cranial neuritis
      • Meningoencephalitis
      • Polyneuropathy
    • mercury T56.1
      ICD-10-CM Diagnosis Code T56.1

      Toxic effects of mercury and its compounds

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    • mumps B26.2
      ICD-10-CM Diagnosis Code B26.2

      Mumps encephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    • Naegleria B60.2
      (amebae) (organisms) (fowleri)
      ICD-10-CM Diagnosis Code B60.2

      Naegleriasis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Primary amebic meningoencephalitis
    • Parastrongylus cantonensis B83.2
      ICD-10-CM Diagnosis Code B83.2

      Angiostrongyliasis due to Parastrongylus cantonensis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Eosinophilic meningoencephalitis due to Parastrongylus cantonensis

      Type 2 Excludes

      • intestinal angiostrongyliasis (B81.3)
    • toxoplasmosis (acquired) B58.2
      ICD-10-CM Diagnosis Code B58.2

      Toxoplasma meningoencephalitis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
      • congenital P37.1
        ICD-10-CM Diagnosis Code P37.1

        Congenital toxoplasmosis

        2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code Code on Newborn Record

        Applicable To

        • Hydrocephalus due to congenital toxoplasmosis
  • infectious A86
    (acute) (viral)
    ICD-10-CM Diagnosis Code A86

    Unspecified viral encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Viral encephalomyelitis NOS
    • Viral meningoencephalitis NOS
  • influenzal G00.0
    (H. influenzae)
    ICD-10-CM Diagnosis Code G00.0

    Hemophilus meningitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Meningitis due to Hemophilus influenzae
  • Listeria monocytogenes A32.12
    ICD-10-CM Diagnosis Code A32.12

    Listerial meningoencephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • lymphocytic A87.2
    (serous)
    ICD-10-CM Diagnosis Code A87.2

    Lymphocytic choriomeningitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Lymphocytic meningoencephalitis
  • mumps B26.2
    ICD-10-CM Diagnosis Code B26.2

    Mumps encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • parasitic NEC B89
    ICD-10-CM Diagnosis Code B89

    Unspecified parasitic disease

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • pneumococcal G04.2
    ICD-10-CM Diagnosis Code G04.2

    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • primary amebic B60.2
    ICD-10-CM Diagnosis Code B60.2

    Naegleriasis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Primary amebic meningoencephalitis
  • specific A52.14
    (syphilitic)
    ICD-10-CM Diagnosis Code A52.14

    Late syphilitic encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • specified organism NEC G04.81
    ICD-10-CM Diagnosis Code G04.81

    Other encephalitis and encephalomyelitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)
  • staphylococcal G04.2
    ICD-10-CM Diagnosis Code G04.2

    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • streptococcal G04.2
    ICD-10-CM Diagnosis Code G04.2

    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • syphilitic A52.14
    ICD-10-CM Diagnosis Code A52.14

    Late syphilitic encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • toxic NEC G92.8
    ICD-10-CM Diagnosis Code G92.8

    Other toxic encephalopathy

    2022 - New Code 2023 Billable/Specific Code

    Applicable To

    • Toxic encephalitis
    • Toxic metabolic encephalopathy

    Code First

    • poisoning due to drug or toxin, if applicable, (T36-T65 with fifth or sixth character 1-4 or 6)

    Use Additional

    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
    • due to mercury T56.1
      ICD-10-CM Diagnosis Code T56.1

      Toxic effects of mercury and its compounds

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • tuberculous A17.82
    ICD-10-CM Diagnosis Code A17.82

    Tuberculous meningoencephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Tuberculous myelitis
  • virus NEC A86
    ICD-10-CM Diagnosis Code A86

    Unspecified viral encephalitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Viral encephalomyelitis NOS
    • Viral meningoencephalitis NOS