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meningitis (due to):

candidal (B37.5)
coccidioidomycosis (B38.4)
cryptococcal meningitis (B45.1)
herpesviral [herpes simplex] (B00.3)
infectious mononucleosis (B27.-2)
measles (B05.1)
mumps (B26.1)
rubella (B06.02)
varicella [chickenpox] (B01.0)
zoster (B02.1)
meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere (G05)

G03 Meningitis due to other and unspecified causes

Includes arachnoiditis NOS
leptomeningitis NOS
meningitis NOS
pachymeningitis NOS
Excludes1: meningoencephalitis (G04.-)
meningomyelitis (G04.-)
G03.0 Nonpyogenic meningitis
Aseptic meningitis
Nonbacterial meningitis
G03.1 Chronic meningitis
G03.2 Benign recurrent meningitis [Mollaret]
G03.8 Meningitis due to other specified causes
G03.9 Meningitis, unspecified
Arachnoiditis (spinal) NOS

G04 Encephalitis, myelitis and encephalomyelitis

Includes acute ascending myelitis
meningoencephalitis
meningomyelitis
Excludes1: encephalopathy NOS (G93.40)
Excludes2: acute transverse myelitis (G37.3-)
alcoholic encephalopathy (G31.2)
benign myalgic encephalomyelitis (G93.3)
multiple sclerosis (G35)
subacute necrotizing myelitis (G37.4)
toxic encephalitis (G92)
toxic encephalopathy (G92)
G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)
Excludes1: acute necrotizing hemorrhagic encephalopathy (G04.3-)
G04.