2017/18 ICD-10-CM Diagnosis Code G05

Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • underlying disease, such as:
  • human immunodeficiency virus [HIV] disease (
    ICD-10-CM Diagnosis Code B20

    Human immunodeficiency virus [HIV] disease

      2016 2017 2018 Billable/Specific Code
    Code First
    • Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
    Includes
    • acquired immune deficiency syndrome [AIDS]
    • AIDS-related complex [ARC]
    • HIV infection, symptomatic
    Type 1 Excludes
    • asymptomatic human immunodeficiency virus [HIV] infection status (Z21)
    • exposure to HIV virus (Z20.6)
    • inconclusive serologic evidence of HIV (R75)
    Use Additional
    • code(s) to identify all manifestations of HIV infection
    B20
    )
  • poliovirus (
    ICD-10-CM Diagnosis Code A80
    • A80 Acute poliomyelitis
      • A80.0 Acute paralytic poliomyelitis, vaccine-associ...
      • A80.1 Acute paralytic poliomyelitis, wild virus, im...
      • A80.2 Acute paralytic poliomyelitis, wild virus, in...
      • A80.3 Acute paralytic poliomyelitis, other and unsp...
        • A80.30 Acute paralytic poliomyelitis, unspecified
        • A80.39 Other acute paralytic poliomyelitis
      • A80.4 Acute nonparalytic poliomyelitis
      • A80.9 Acute poliomyelitis, unspecified
    A80.-
    )
  • suppurative otitis media (
    ICD-10-CM Diagnosis Code H66.01

    Acute suppurative otitis media with spontaneous rupture of ear drum

      2016 2017 2018 Non-Billable/Non-Specific Code
    H66.01-
    ICD-10-CM Diagnosis Code H66.4

    Suppurative otitis media, unspecified

      2016 2017 2018 Non-Billable/Non-Specific Code
    Applicable To
    • Purulent otitis media NOS
    Use Additional
    • code for any associated perforated tympanic membrane (H72.-)
    H66.4
    )
  • trichinellosis (
    ICD-10-CM Diagnosis Code B75

    Trichinellosis

      2016 2017 2018 Billable/Specific Code
    Includes
    • infection due to Trichinella species
    • trichiniasis
    B75
    )
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G05. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • adenoviral encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code A85.1

    Adenoviral encephalitis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Adenoviral meningoencephalitis
    A85.1
    )
  • congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code P37.1

    Congenital toxoplasmosis

      2016 2017 2018 Billable/Specific Code Code on Newborn Record
    Applicable To
    • Hydrocephalus due to congenital toxoplasmosis
    P37.1
    )
  • cytomegaloviral encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B25.8

    Other cytomegaloviral diseases

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Cytomegaloviral encephalitis
    B25.8
    )
  • encephalitis, myelitis and encephalomyelitis (in) measles (
    ICD-10-CM Diagnosis Code B05.0

    Measles complicated by encephalitis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Postmeasles encephalitis
    B05.0
    )
  • encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (
    ICD-10-CM Diagnosis Code M32.19

    Other organ or system involvement in systemic lupus erythematosus

      2016 2017 2018 Billable/Specific Code
    M32.19
    )
  • enteroviral encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code A85.0

    Enteroviral encephalitis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Enteroviral encephalomyelitis
    A85.0
    )
  • eosinophilic meningoencephalitis (
    ICD-10-CM Diagnosis Code B83.2

    Angiostrongyliasis due to Parastrongylus cantonensis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Eosinophilic meningoencephalitis due to Parastrongylus cantonensis
    Type 2 Excludes
    • intestinal angiostrongyliasis (B81.3)
    B83.2
    )
  • herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B00.4

    Herpesviral encephalitis

      2016 2017 2018 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-)
    B00.4
    )
  • listerial encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code A32.12

    Listerial meningoencephalitis

      2016 2017 2018 Billable/Specific Code
    A32.12
    )
  • meningococcal encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code A39.81

    Meningococcal encephalitis

      2016 2017 2018 Billable/Specific Code
    A39.81
    )
  • mumps encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B26.2

    Mumps encephalitis

      2016 2017 2018 Billable/Specific Code
    B26.2
    )
  • postchickenpox encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B01.1

    Varicella encephalitis, myelitis and encephalomyelitis

      2016 2017 2018 Non-Billable/Non-Specific Code
    Applicable To
    • Postchickenpox encephalitis, myelitis and encephalomyelitis
    B01.1-
    )
  • rubella encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B06.01

    Rubella encephalitis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Rubella meningoencephalitis
    B06.01
    )
  • toxoplasmosis encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B58.2

    Toxoplasma meningoencephalitis

      2016 2017 2018 Billable/Specific Code
    B58.2
    )
  • zoster encephalitis, myelitis and encephalomyelitis (
    ICD-10-CM Diagnosis Code B02.0

    Zoster encephalitis

      2016 2017 2018 Billable/Specific Code
    Applicable To
    • Zoster meningoencephalitis
    B02.0
    )
The following code(s) above G05 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 G05:
  • G00-G99
    2018 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
Code History
Code annotations containing back-references to G05:
ICD-10-CM Codes Adjacent To G05
G04.30 …… unspecified
G04.31 Postinfectious acute necrotizing hemorrhagic encephalopathy
G04.32 Postimmunization acute necrotizing hemorrhagic encephalopathy
G04.39 Other acute necrotizing hemorrhagic encephalopathy
G04.8 Other encephalitis, myelitis and encephalomyelitis
G04.81 Other encephalitis and encephalomyelitis
G04.89 Other myelitis
G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified
G04.90 Encephalitis and encephalomyelitis, unspecified
G04.91 Myelitis, unspecified
G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
G05.3 Encephalitis and encephalomyelitis in diseases classified elsewhere
G05.4 Myelitis in diseases classified elsewhere
G06 Intracranial and intraspinal abscess and granuloma
G06.0 Intracranial abscess and granuloma
G06.1 Intraspinal abscess and granuloma
G06.2 Extradural and subdural abscess, unspecified
G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
G08 Intracranial and intraspinal phlebitis and thrombophlebitis
G09 Sequelae of inflammatory diseases of central nervous system
G10 Huntington's disease

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