This report examines the use of health care services by children enrolled in Medi-Cal, California's counterpart to Medicaid, and the Child Health and Disability Prevention (CHDP) program. Expenditures related to these services are also examined. Data for the report were derived from utilization and expenditure data from Medi-Cal and CHDP. Analysis of the data revealed that, in comparison to other children, children in foster care: (1) use more Medi-Cal services, which cost more per child; (2) are more likely to use mental health services; (3) are hospitalized longer; and (4) are less likely to receive CHDP services. The following policy implications were drawn from the study: (1) there is a need for early intervention and prevention services for foster care children; (2) CHDP services could be better utilized by foster care children; and (3) there is a need for more information about the health of foster care children. Appendices include a series of 11 figures and 23 tables that present the data discussed in the report; a listing of standards for health care services for children in out-of-home care; a discussion of coordination of health care services for foster care children; and a survey for foster parents. A list of 30 references is provided. (BC)