Table 1.

Demographic Values and Rates for All Herpes Simplex Encephalitis (HSE) (Primary Diagnosis Only) Hospitalizations in the United States per Year

	All Hospitalizationsa			HSE Primary Diagnosis b			Rate of HSE Cases per 100 000
	Total n	Weighted n	%	HSE n	Weighted n	%
	95 068 178	207 468 667	100	4577	10 272	100	4.95
Gender
Male	39374914	85 922 943	41.4	2230	5032	49.0	5.86
Female	55 693 264	121 545 724	58.6	2347	5242	51.0	4.31
Age (continuous)
Age, mean	56.0	…	…	59.9	…	…	…
Age (categorical)
1–17	3 034 721	9 174 432	4.4	139	421	4.1	4.59
18–44	26 462 071	57 808 211	27.9	736	1576	15.3	2.73
45–64	26 777 643	57 777 828	27.8	1569	3598	35.0	6.23
≥65	38 793 743	82 708 199	39.9	2133	4677	45.5	5.65
Primary payorc
Medicare/Medicaid	61 289 069	132 303 789	63.8	2741	6034	58.7	4.56
Private	26 105 284	58 053 657	28.0	1453	3369	32.8	5.80
Uninsured/other	76 58 215	17 081 738	8.2	383	871	8.5	5.10
Discharge dispositiond
Home or self care	64 324 591	141 658 473	68.3	1572	3488	34.0	2.46
Transfer, home health	27 215 115	58 469 192	28.2	2616	5883	57.3	10.06
Against medical advice	1 318 245	2 652 412	1.3	45	85	0.8	3.20
Other	40 752	74 241	0.0	4	7	0.1	9.43
Death	2 120 875	4 513 341	2.2	337	804	7.8	17.81
Hospitalization
Length of stay, mean	4.9	…	…	13.5	…	…	…

^aHospitalizations and HSE cases exclude the last 60 days of each data set and are ≥1 year of age.

^bHSE as primary diagnosis indicated by the first listed diagnosis, either “543” for International Classification Diagnosis Code, ninth edition or “B004,” “B100*” for the tenth edition. HSE cases in this table are not the same as index cases.

^cPayor groups: Medicare/Medicaid = includes both fee-for-service and managed care patients; private = includes commercial carriers and private health maintenance organizations (HMOs)/preferred provider organizations (PPOs); uninsured/other = includes worker’s compensation, CHAMPUS, CHAMPVA, Title V, and other government programs.

^dTransfer includes short-term hospitals, skilled nursing facility, or intermediate care facility.