Despite substantial progress in reducing exposures to lead among children, as recently as 1991, 9% of children in the United States had blood lead levels (BLLs) of > or = 10 micrograms/dL (1)--levels that can adversely affect intelligence and behavior. In 1991, CDC recommended screening all children for lead exposure except those residing in communities in which large numbers or percentages previously had been screened and determined not to have lead poisoning (2). Subsequently, the California Department of Health Services (CDHS) issued a directive to all California health-care providers participating in the Child Health and Disability Prevention Program to routinely screen children for lead poisoning in accordance with the 1991 CDC guidelines (3). This report presents finding of BLL testing during 1992-1993 from a managed-care organization that provides primary-care services to Medicaid beneficiaries in several locations in California (i.e., Los Angeles County, Orange County, San Bernardino County, Riverside County, Sacramento, and Placerville).