2011 ICD-9-CM Diagnosis Code 323.9 : Unspecified cause of encephalitis

Home > 2011 ICD-9-CM Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-327 > Encephalitis myelitis and encephalomyelitis 323-

2011 ICD-9-CM Diagnosis Code 323.9

Unspecified cause of encephalitis

Short description: Encephalitis NOS.
ICD-9-CM 323.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 323.9 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
You are viewing the 2011 version of ICD-9-CM 323.9.
More recent version(s) of ICD-9-CM 323.9: 2012 2013 2014 2015.

Convert to ICD-10-CM: 323.9 converts approximately to:

2015/16 ICD-10-CM G04.90 Encephalitis and encephalomyelitis, unspecified
Or:
2015/16 ICD-10-CM G04.91 Myelitis, unspecified

Approximate Synonyms

Acute and subacute hemorrhagic leukoencephalitis [Hurst]
Acute ascending myelitis
Acute hemorrhagic encephalomyelitis
Acute hemorrhagic leukoencephalitis
Acute necrotizing myelitis
Acute non-infective transverse myelitis
Acute transverse myelitis
Acute viral transverse myelitis
Brainstem encephalitis
Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
Cerebral irritation
Encephalitis
Encephalitis associated with AIDS
Encephalitis, limbic
Encephalitis, myelitis and encephalomyelitis
Encephalomyelitis
Encephalomyelitis, hemorrhagic, acute
Focal encephalitis
Fungal infection of brain
Granulomatous meningoencephalitis
Granulomatous meningoencephalomyelitis
Inflammation of spinal cord due to toxin
Leukoencephalopathy
Leukoencephalopathy, subcortical
Limbic encephalitis
Meningoencephalitis
Meningoencephalomyelitis
Meningomyelitis
Myelitis
Myelitis associated with AIDS
Necrotizing myelitis of CNS, subacute
Primary encephalitis
Rasmussen syndrome
Subacute hemorrhagic leukoencephalitis
Subacute necrotizing myelitis
Subacute necrotizing myelitis of CNS
Subcortical leukoencephalopathy
Transverse myelopathy syndrome

ICD-9-CM Volume 2 Index entries containing back-references to 323.9:

Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9
- acute - see also Encephalitis, viral
  - disseminated (postinfectious) NEC 136.9 [323.61]
    - postimmunization or postvaccination 323.51
  - inclusional 049.8
  - inclusion body 049.8
  - necrotizing 049.8
- arboviral, arbovirus NEC 064
- arthropod-borne (see also Encephalitis, viral, arthropod-borne) 064
- Australian X 062.4
- Bwamba fever 066.3
- California (virus) 062.5
- Central European 063.2
- Czechoslovakian 063.2
- Dawson's (inclusion body) 046.2
- diffuse sclerosing 046.2
- due to
  - actinomycosis 039.8 [323.41]
  - cat-scratch disease 078.3 [323.01]
  - human herpesvirus 6 058.21
  - human herpesvirus 7 058.29
  - human herpesvirus NEC 058.29
  - infection classified elsewhere 136.9 [323.41]
  - infectious mononucleosis 075 [323.01]
  - malaria (see also Malaria) 084.6 [323.2]
  - negishi virus 064
  - ornithosis 073.7 [323.01]
  - prophylactic inoculation against smallpox 323.51
  - rickettsiosis (see also Rickettsiosis) 083.9 [323.1]
  - rubella 056.01
  - toxoplasmosis (acquired) 130.0
    - congenital (active) 771.2 [323.41]
  - typhus (fever) (see also Typhus) 081.9 [323.1]
  - vaccination (smallpox) 323.51
- Eastern equine 062.2
- endemic 049.8
- epidemic 049.8
- equine (acute) (infectious) (viral) 062.9
  - eastern 062.2
  - venezuelan 066.2
  - western 062.1
- Far Eastern 063.0
- following vaccination or other immunization procedure 323.51
- herpes 054.3
- human herpesvirus 6 058.21
- human herpesvirus 7 058.29
- human herpesvirus NEC 058.29
- ilheus (virus) 062.8
- inclusion body 046.2
- infectious (acute) (virus) NEC 049.8
- influenzal (see also Influenza) 487.8 [323.41]
  - lethargic 049.8
- Japanese (B type) 062.0
- La Crosse 062.5
- Langat 063.8
- late effect - see Late, effect, encephalitis
- lead 984.9 [323.71]
- lethargic (acute) (infectious) (influenzal) 049.8
- lethargica 049.8
- louping ill 063.1
- lupus 710.0 [323.81]
- lymphatica 049.0
- Mengo 049.8
- meningococcal 036.1
- mumps 072.2
- Murray Valley 062.4
- myoclonic 049.8
- Negishi virus 064
- otitic NEC 382.4 [323.41]
- parasitic NEC 123.9 [323.41]
- periaxialis (concentrica) (diffusa) 341.1
- postchickenpox 052.0
- postexanthematous NEC 057.9 [323.62]
- postimmunization 323.51
- postinfectious NEC 136.9 [323.62]
- postmeasles 055.0
- posttraumatic 323.81
- postvaccinal (smallpox) 323.51
- postvaricella 052.0
- postviral NEC 079.99 [323.62]
  - postexanthematous 057.9 [323.62]
    - specified NEC 057.8 [323.62]
- Powassan 063.8
- progressive subcortical (Binswanger's) 290.12
- Rasmussen 323.81
- Rio Bravo 049.8
- rubella 056.01
- Russian
  - autumnal 062.0
  - spring-summer type (taiga) 063.0
- saturnine 984.9 [323.71]
- Semliki Forest 062.8
- serous 048
- slow-acting virus NEC 046.8
- specified cause NEC 323.81
- St. Louis type 062.3
- subacute sclerosing 046.2
- subcorticalis chronica 290.12
- summer 062.0
- suppurative 324.0
- syphilitic 094.81
  - congenital 090.41
- tick-borne 063.9
- torula, torular 117.5 [323.41]
- toxic NEC 989.9 [323.71]
- toxoplasmic (acquired) 130.0
  - congenital (active) 771.2 [323.41]
- trichinosis 124 [323.41]
- Trypanosomiasis (see also Trypanosomiasis) 086.9 [323.2]
- tuberculous (see also Tuberculosis) 013.6
- type B (Japanese) 062.0
- type C 062.3
- van Bogaert's 046.2
- Venezuelan 066.2
- Vienna type 049.8
- viral, virus 049.9
  - arthropod-borne NEC 064
    - mosquito-borne 062.9
      - Australian X disease 062.4
      - California virus 062.5
      - Eastern equine 062.2
      - Ilheus virus 062.8
      - Japanese (B type) 062.0
      - Murray Valley 062.4
      - specified type NEC 062.8
      - St. Louis 062.3
      - type B 062.0
      - type C 062.3
      - Western equine 062.1
    - tick-borne 063.9
      - biundulant 063.2
      - Central European 063.2
      - Czechoslovakian 063.2
      - diphasic meningoencephalitis 063.2
      - Far Eastern 063.0
      - Langat 063.8
      - louping ill 063.1
      - Powassan 063.8
      - Russian spring-summer (taiga) 063.0
      - specified type NEC 063.8
    - vector unknown 064
  - slow acting NEC 046.8
  - specified type NEC 049.8
  - vaccination, prophylactic (against) V05.0
- von Economo's 049.8
- Western equine 062.1
- West Nile type 066.41
Encephalomyelitis (chronic) (granulomatous) (myalgic, benign) (see also Encephalitis) 323.9
- abortive disseminated 049.8
- acute disseminated (ADEM) (postinfectious) 136.9 [323.61]
  - infectious 136.9 [323.61]
  - noninfectious 323.81
  - postimmunization 323.51
- due to
  - cat-scratch disease 078.3 [323.01]
  - infectious mononucleosis 075 [323.01]
  - ornithosis 073.7 [323.01]
  - vaccination (any) 323.51
- equine (acute) (infectious) 062.9
  - eastern 062.2
  - venezuelan 066.2
  - western 062.1
- funicularis infectiosa 049.8
- late effect - see Late, effect, encephalitis
- Munch-Peterson's 049.8
- postchickenpox 052.0
- postimmunization 323.51
- postmeasles 055.0
- postvaccinal (smallpox) 323.51
- rubella 056.01
- specified cause NEC 323.81
- syphilitic 094.81
- West Nile 066.41
Fever 780.60
- brain 323.9
  - late effect - see category 326
- cerebral 323.9
  - late effect - see category 326
Hematomyelitis 323.9
- late effect - see category 326
Infection, infected, infective (opportunistic) 136.9
- brain (see also Encephalitis) 323.9
  - late effect - see category 326
  - membranes - (see also Meningitis) 322.9
  - septic 324.0
    - late effect - see category 326
    - meninges (see also Meningitis) 320.9
- spinal cord NEC (see also Encephalitis) 323.9
  - abscess 324.1
    - late effect - see category 326
  - late effect - see category 326
  - meninges - see Meningitis
  - streptococcal 320.2
Inflammation, inflamed, inflammatory (with exudation)
- brain (see also Encephalitis) 323.9
  - late effect - see category 326
  - membrane - see Meningitis
- cerebral (see also Encephalitis) 323.9
  - late effect - see category 326
  - membrane - see Meningitis
- spinal
  - cord (see also Encephalitis) 323.9
    - late effect - see category 326
  - membrane - see Meningitis
  - nerve - see Disorder, nerve
Leukoencephalopathy (see also Encephalitis) 323.9
- acute necrotizing hemorrhagic (postinfectious) 136.9 [323.61]
  - postimmunization or postvaccinal 323.51
- Binswanger's 290.12
- metachromatic 330.0
- multifocal (progressive) 046.3
- progressive multifocal 046.3
- reversible, posterior 348.5
Meningoencephalitis (see also Encephalitis) 323.9
- acute NEC 048
- bacterial, purulent, pyogenic, or septic - see Meningitis
- chronic NEC 094.1
- diffuse NEC 094.1
- diphasic 063.2
- due to
  - actinomycosis 039.8 [320.7]
  - blastomycosis NEC (see also Blastomycosis) 116.0 [323.41]
  - free-living amebae 136.29
  - Listeria monocytogenes 027.0 [320.7]
  - Lyme disease 088.81 [320.7]
  - mumps 072.2
  - Naegleria (amebae) (gruberi) (organisms) 136.29
  - rubella 056.01
  - sporotrichosis 117.1 [321.1]
  - toxoplasmosis (acquired) 130.0
    - congenital (active) 771.2 [323.41]
  - Trypanosoma 086.1 [323.2]
- epidemic 036.0
- herpes 054.3
- herpetic 054.3
- H. influenzae 320.0
- infectious (acute) 048
- influenzal 320.0
- late effect - see category 326
- Listeria monocytogenes 027.0 [320.7]
- lymphocytic (serous) 049.0
- mumps 072.2
- parasitic NEC 123.9 [323.41]
- pneumococcal 320.1
- primary amebic 136.29
- rubella 056.01
- serous 048
  - lymphocytic 049.0
- specific 094.2
- staphylococcal 320.3
- streptococcal 320.2
- syphilitic 094.2
- toxic NEC 989.9 [323.71]
  - due to
    - carbon tetrachloride (vapor) 987.8 [323.71]
    - hydroxyquinoline derivatives poisoning 961.3 [323.71]
    - lead 984.9 [323.71]
    - mercury 985.0 [323.71]
    - thallium 985.8 [323.71]
- toxoplasmosis (acquired) 130.0
- trypanosomic 086.1 [323.2]
- tuberculous (see also Tuberculosis, meninges) 013.0
- virus NEC 048
Meningoencephalomyelitis (see also Meningoencephalitis) 323.9
- acute NEC 048
  - disseminated (postinfectious) 136.9 [323.61]
    - postimmunization or postvaccination 323.51
- due to
  - actinomycosis 039.8 [320.7]
  - torula 117.5 [323.41]
  - toxoplasma or toxoplasmosis (acquired) 130.0
    - congenital (active) 771.2 [323.41]
- late effect - see category 326
Meningomyelitis (see also Meningoencephalitis) 323.9
- blastomycotic NEC (see also Blastomycosis) 116.0 [323.41]
- due to
  - actinomycosis 039.8 [320.7]
  - blastomycosis (see also Blastomycosis) 116.0 [323.41]
  - Meningococcus 036.0
  - sporotrichosis 117.1 [323.41]
  - torula 117.5 [323.41]
- late effect - see category 326
- lethargic 049.8
- meningococcal 036.0
- syphilitic 094.2
- tuberculous (see also Tuberculosis, meninges) 013.0
Mesencephalitis (see also Encephalitis) 323.9
- late effect - see category 326
Myelitis (ascending) (cerebellar) (childhood) (chronic) (descending) (diffuse) (disseminated) (pressure) (progressive) (spinal cord) (subacute) (see also Encephalitis) 323.9
- acute (transverse) 341.20
  - idiopathic 341.22
  - in conditions classified elsewhere 341.21
- due to
  - infection classified elsewhere 136.9 [323.42]
  - specified cause NEC 323.82
  - vaccination (any) 323.52
  - viral diseases classified elsewhere 323.02
- herpes simplex 054.74
- herpes zoster 053.14
- late effect - see category 326
- optic neuritis in 341.0
- postchickenpox 052.2
- postimmunization 323.52
- postinfectious 136.9 [323.63]
- postvaccinal 323.52
- postvaricella 052.2
- syphilitic (transverse) 094.89
- toxic 989.9 [323.72]
- transverse 323.82
  - acute 341.20
    - idiopathic 341.22
    - in conditions classified elsewhere 341.21
  - idiopathic 341.22
- tuberculous (see also Tuberculosis) 013.6
- virus 049.9
Parencephalitis (see also Encephalitis) 323.9
- late effect - see category 326
Phrenitis 323.9
Syringomyelitis 323.9
- late effect - see category 326

323.82

ICD9Data.com

324

ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 323.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2011 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.

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