Volume 10, Number 8—August 2004
Research
Acute Encephalitis Hospitalizations, California, 1990–1999: Unrecognized Arboviral Encephalitis?
Rosalie T. Trevejo*
Table 1
Diagnoses for acute infectious or unspecified encephalitis among hospitalized patients in California, 1990–1999a
| Diagnosis (ICD-9-CMb) | No. of encephalitis diagnoses (%)c |
|---|---|
| Encephalitis of unspecified cause |
|
| Unspecified cause of encephalitis (323.9) |
4,841 (34.7) |
| Unspecified non-arthropod-borne viral diseases of CNS (049.9) |
2,932 (21.0) |
| Viral encephalitis with specified cause, not arboviral |
|
| Acute paralytic poliomyelitis specified as bulbar (045.0) |
44 (0.3) |
| Other specified nonarthropodborne viral diseases of central nervous system (049.8) |
288 (2.1) |
| Herpetic meningoencephalitis (054.3) |
2,007 (14.4) |
| Encephalomyelitis due to rubella (056.01) |
6 (0.04) |
| Rabies (071) |
13 (0.1) |
| Mumps encephalitis (072.2) |
14 (0.1) |
| Encephalitis in viral diseases classified elsewhere (323.0) |
76 (0.5) |
| Other causes of encephalitis |
|
| Other encephalitis due to infection classified elsewhere (323.4) |
117 (0.8) |
| Other causes of encephalitis (323.8) |
2,196 (15.8) |
| Postinfectious causes of encephalitis |
|
| Postvaricella encephalitis (052.0) |
421 (3.0) |
| Post measles encephalitis (055.0) |
41 (0.3) |
| Postinfectious encephalitis (323.6) |
595 (4.3) |
| Bacterial/rickettsial causes of encephalitis |
|
| Tuberculous encephalitis or myelitis (013.6) |
30 (0.2) |
| Meningococcal encephalitis (036.1) |
128 (0.9) |
| Syphilitic encephalitis (094.81) |
11 (0.1) |
| Encephalitis in rickettsial diseases classified elsewhere (323.1) |
0 (0) |
| Parasitic/protozoal causes of encephalitis |
|
| Meningoencephalitis attributable to toxoplasmosis (130.0) |
82 (0.6) |
| Meningoencephalitis attributable to Naegleria (136.2) |
10 (0.1) |
| Encephalitis in protozoal diseases classified elsewhere (323.2) |
4 (0.03) |
| Arthropodborne viral encephalitis |
|
| Mosquitoborne viral encephalitis (062.0–062.9) |
63 (0.5) |
| Tickborne viral encephalitis (063.0–063.9) |
6 (0.04) |
| Viral encephalitis transmitted by other and unspecified arthropods (064) |
14 (0.1) |
| Total no. of encephalitis diagnosesd | 13,939 |
aPatients with a concurrent diagnosis of AIDS are excluded.
bInternational Classification of Diseases, 9th Revision, Clinical Modification.
cSource: Office of Statewide Health Planning and Development, Patient Discharge Data, Public Version A.
dTotal number of encephalitis diagnoses is greater than the number of encephalitis patients (n = 13,807) because some patients had two or more encephalitis diagnoses.
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Page updated: March 01, 2011
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