Index to Diseases and Injuries

Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)

Index code:G04.90

acute A86 — see also Encephalitis, viral
disseminated G04.00
infectious G04.01
noninfectious G04.81
postimmunization (postvaccination) G04.02
postinfectious G04.01
inclusion body A85.8
necrotizing hemorrhagic G04.30
postimmunization G04.32
postinfectious G04.31
specified NEC G04.39
arboviral, arbovirus NEC A85.2
arthropod-borne NEC (viral) A85.2
Australian A83.4
California (virus) A83.5
Central European (tick-borne) A84.1
Czechoslovakian A84.1
Dawson's (inclusion body) A81.1
diffuse sclerosing A81.1
disseminated, acute G04.00
due to
cat scratch disease A28.1
human immunodeficiency virus (HIV) disease B20 [G05.3]
malaria — see Malaria
rickettsiosis — see Rickettsiosis
smallpox inoculation G04.02
typhus — see Typhus
Eastern equine A83.2
endemic (viral) A86
epidemic NEC (viral) A86
equine (acute) (infectious) (viral) A83.9
Eastern A83.2
Venezuelan A92.2
Western A83.1
Far Eastern (tick-borne) A84.0
following vaccination or other immunization procedure G04.02
herpes zoster B02.0
herpesviral B00.4
due to herpesvirus 6 B10.01
due to herpesvirus 7 B10.09
specified NEC B10.09
Ilheus (virus) A83.8
inclusion body A81.1
in (due to)
actinomycosis A42.82
adenovirus A85.1
African trypanosomiasis B56.9 [G05.3]
Chagas' disease (chronic) B57.42
cytomegalovirus B25.8
enterovirus A85.0
herpes (simplex) virus B00.4
due to herpesvirus 6 B10.01
due to herpesvirus 7 B10.09
specified NEC B10.09
infectious disease NEC B99 [G05.3]
influenza — see Influenza, with, encephalopathy
listeriosis A32.12
measles B05.0
mumps B26.2
naegleriasis B60.2
parasitic disease NEC B89 [G05.3]
poliovirus A80.9 [G05.3]
rubella B06.01
syphilis
congenital A50.42
late A52.14
systemic lupus erythematosus M32.19 [G05.3]
toxoplasmosis (acquired) B58.2
congenital P37.1
tuberculosis A17.82
zoster B02.0
infectious (acute) (virus) NEC A86
Japanese (B type) A83.0
La Crosse A83.5
lead — see Poisoning, lead
lethargica (acute) (infectious) A85.8
louping ill A84.89
lupus erythematosus, systemic M32.19 [G05.3]
lymphatica A87.2
Mengo A85.8
meningococcal A39.81
Murray Valley A83.4
otitic NEC H66.40 [G05.3]
parasitic NOS B71.9
periaxial G37.0
periaxialis (concentrica) (diffuse) G37.5
postchickenpox B01.11
postexanthematous NEC B09
postimmunization G04.02
postinfectious NEC G04.01
postmeasles B05.0
postvaccinal G04.02
postvaricella B01.11
postviral NEC A86
Powassan A84.81
Rasmussen G04.81
Rio Bravo A85.8
Russian
autumnal A83.0
spring-summer (taiga) A84.0
saturnine — see Poisoning, lead
specified NEC G04.81
St. Louis A83.3
subacute sclerosing A81.1
summer A83.0
suppurative G04.81
tick-borne A84.9
Torula, torular (cryptococcal) B45.1
toxic NEC G92.8
trichinosis B75 [G05.3]
type
B A83.0
C A83.3
van Bogaert's A81.1
Venezuelan equine A92.2
Vienna A85.8
viral, virus A86
arthropod-borne NEC A85.2
mosquito-borne A83.9
Australian X disease A83.4
California virus A83.5
Eastern equine A83.2
Japanese (B type) A83.0
Murray Valley A83.4
specified NEC A83.8
St. Louis A83.3
type B A83.0
type C A83.3
Western equine A83.1
tick-borne A84.9
biundulant A84.1
central European A84.1
Czechoslovakian A84.1
diphasic meningoencephalitis A84.1
Far Eastern A84.0
Russian spring-summer (taiga) A84.0
specified NEC A84.89
specified type NEC A85.8
tick-borne, specified NEC A84.89
Western equine A83.1

Use the index to find a code, then confirm it in the Tabular List before assigning it. A code ending in a dash is incomplete, and a code in [brackets] is a manifestation code reported after the underlying condition. Search the whole index.

Frequently asked questions

What is the ICD-10-CM code for Encephalitis?

The ICD-10-CM Alphabetic Index directs "Encephalitis" to G04.90. Subterms below it may lead to a more specific code. Always confirm the code in the Tabular List before assigning it.

ICD-10-CM Index to Diseases and Injuries maintained by CDC/NCHS (public domain), from the CMS FY2027 release.