Inflammatory diseases of the central nervous system (G00-G09)

G00Bacterial meningitis, not elsewhere classified
Includes: bacterial arachnoiditis
› bacterial leptomeningitis
› bacterial meningitis
› bacterial pachymeningitis
Excludes 1: bacterial meningoencephalitis (G04.2)
› bacterial meningomyelitis (G04.2)

G00.0Hemophilus meningitis
› Meningitis due to Hemophilus influenzae

G00.1Pneumococcal meningitis
› Meningtitis due to Streptococcal pneumoniae

G00.2Streptococcal meningitis
Use Additional Code: code to further identify organism (B95.0-B95.5)

G00.3Staphylococcal meningitis
Use Additional Code: code to further identify organism (B95.61-B95.8)

G00.8Other bacterial meningitis
› Meningitis due to Escherichia coli
› Meningitis due to Friedländer's bacillus
› Meningitis due to Klebsiella
Use Additional Code: code to further identify organism (B96.-)

G00.9Bacterial meningitis, unspecified
› Meningitis due to gram-negative bacteria, unspecified
› Purulent meningitis NOS
› Pyogenic meningitis NOS
› Suppurative meningitis NOS

G01Meningitis in bacterial diseases classified elsewhere
Code First: underlying disease
Excludes 1: meningitis (in):
› gonococcal (A54.81)
› leptospirosis (A27.81)
› listeriosis (A32.11)
› Lyme disease (A69.21)
› meningococcal (A39.0)
› neurosyphilis (A52.13)
› tuberculosis (A17.0)
› meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere (G05)

G02Meningitis in other infectious and parasitic diseases classified elsewhere
Code First: underlying disease, such as:
› African trypanosomiasis (B56.-)
› poliovirus infection (A80.-)
Excludes 1: candidal meningitis (B37.5)
› coccidioidomycosis meningitis (B38.4)
› cryptococcal meningitis (B45.1)
› herpesviral [herpes simplex] meningitis (B00.3)
› infectious mononucleosis complicated by meningitis (B27.- with fifth character 2)
› measles complicated by meningitis (B05.1)
› meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere (G05)
› mumps meningitis (B26.1)
› rubella meningitis (B06.02)
› varicella [chickenpox] meningitis (B01.0)
› zoster meningitis (B02.1)

G03Meningitis due to other and unspecified causes
Includes: arachnoiditis NOS
› leptomeningitis NOS
› meningitis NOS
› pachymeningitis NOS
Excludes 1: meningoencephalitis (G04.-)
› meningomyelitis (G04.-)

G03.0Nonpyogenic meningitis
› Aseptic meningitis
› Nonbacterial meningitis

G03.1Chronic meningitis

G03.2Benign recurrent meningitis [Mollaret]

G03.8Meningitis due to other specified causes

G03.9Meningitis, unspecified
› Arachnoiditis (spinal) NOS

G04Encephalitis, myelitis and encephalomyelitis
Includes: acute ascending myelitis
› meningoencephalitis
› meningomyelitis
Excludes 1: encephalopathy NOS (G93.40)
Excludes 2: acute transverse myelitis (G37.3)
› alcoholic encephalopathy (G31.2)
› multiple sclerosis (G35)
› myalgic encephalomyelitis (G93.32)
› subacute necrotizing myelitis (G37.4)
› toxic encephalitis (G92.8)
› toxic encephalopathy (G92.8)

G04.0Acute disseminated encephalitis and encephalomyelitis (ADEM)
Excludes 1: acute necrotizing hemorrhagic encephalopathy (G04.3-)
› other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)

G04.00Acute disseminated encephalitis and encephalomyelitis, unspecified

G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
Excludes 1: post chickenpox encephalitis (B01.1)
› post measles encephalitis (B05.0)
› post measles myelitis (B05.1)

G04.02Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
› Encephalitis, post immunization
› Encephalomyelitis, post immunization
Use Additional Code: code to identify the vaccine (T50.A-, T50.B-, T50.Z-)

G04.1Tropical spastic paraplegia

G04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

G04.3Acute necrotizing hemorrhagic encephalopathy
Excludes 1: acute disseminated encephalitis and encephalomyelitis (G04.0-)

G04.30Acute necrotizing hemorrhagic encephalopathy, unspecified

G04.31Postinfectious acute necrotizing hemorrhagic encephalopathy

G04.32Postimmunization acute necrotizing hemorrhagic encephalopathy
Use Additional Code: code to identify the vaccine (T50.A-, T50.B-, T50.Z-)

G04.39Other acute necrotizing hemorrhagic encephalopathy
Code Also: underlying etiology, if applicable

G04.8Other encephalitis, myelitis and encephalomyelitis
Code Also: any associated seizure (G40.-, R56.9)

G04.81Other encephalitis and encephalomyelitis
› Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)

G04.82Acute flaccid myelitis
Excludes 1: transverse myelitis (G37.3)

G04.89Other myelitis

G04.9Encephalitis, myelitis and encephalomyelitis, unspecified

G04.90Encephalitis and encephalomyelitis, unspecified
› Ventriculitis (cerebral) NOS

G04.91Myelitis, unspecified

G05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
Code First: underlying disease, such as:
› congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
› cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
› encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
› eosinophilic meningoencephalitis (B83.2)
› human immunodeficiency virus [HIV] disease (B20)
› poliovirus (A80.-)
› suppurative otitis media (H66.01-H66.4)
› systemic lupus erythematosus (M32.19)
› trichinellosis (B75)
Excludes 1: adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
› encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
› enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
› 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)

G05.3Encephalitis and encephalomyelitis in diseases classified elsewhere
› Meningoencephalitis in diseases classified elsewhere
Code First: underlying disease

G05.4Myelitis in diseases classified elsewhere
› Meningomyelitis in diseases classified elsewhere

G06Intracranial and intraspinal abscess and granuloma
Use Additional Code: code (B95-B97) to identify infectious agent.

G06.0Intracranial abscess and granuloma
› Brain [any part] abscess (embolic)
› Cerebellar abscess (embolic)
› Cerebral abscess (embolic)
› Intracranial epidural abscess or granuloma
› Intracranial extradural abscess or granuloma
› Intracranial subdural abscess or granuloma
› Otogenic abscess (embolic)
Excludes 1: tuberculous intracranial abscess and granuloma (A17.81)

G06.1Intraspinal abscess and granuloma
› Abscess (embolic) of spinal cord [any part]
› Intraspinal epidural abscess or granuloma
› Intraspinal extradural abscess or granuloma
› Intraspinal subdural abscess or granuloma
Excludes 1: tuberculous intraspinal abscess and granuloma (A17.81)

G06.2Extradural and subdural abscess, unspecified

G07Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
Code First: underlying disease, such as:
› schistosomiasis granuloma of brain (B65.-)
Excludes 1: abscess of brain:
› amebic (A06.6)
› chromomycotic (B43.1)
› gonococcal (A54.82)
› tuberculous (A17.81)
› tuberculoma of meninges (A17.1)

G08Intracranial and intraspinal phlebitis and thrombophlebitis
› Septic embolism of intracranial or intraspinal venous sinuses and veins
› Septic endophlebitis of intracranial or intraspinal venous sinuses and veins
› Septic phlebitis of intracranial or intraspinal venous sinuses and veins
› Septic thrombophlebitis of intracranial or intraspinal venous sinuses and veins
› Septic thrombosis of intracranial or intraspinal venous sinuses and veins
Excludes 1: intracranial phlebitis and thrombophlebitis complicating:
› abortion, ectopic or molar pregnancy (O00-O07, O08.7)
› pregnancy, childbirth and the puerperium (O22.5, O87.3)
› nonpyogenic intracranial phlebitis and thrombophlebitis (I67.6)
Excludes 2: intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)

G09Sequelae of inflammatory diseases of central nervous system

Category G09 is to be used to indicate conditions whose primary classification is to G00-G08 as the cause of sequelae, themselves classifiable elsewhere. The 'sequelae' include conditions specified as residuals.