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.
Page created: March 01, 2011
Page updated: March 01, 2011
Page reviewed: March 01, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.