[영문]AB Background: Medical Home is an evolving concept of patient-centered care yet little information is available on its effect on health care expenditures for children. Objectives: To quantify differences in patterns of care and costs to the North Carolina (NC) Medicaid program for children with asthma across 3 programs: fee-for-service (FFS), primary care case management (PCCM), and Medical Homes. Research Design: NC Medicaid claims from 1998-2001 for children with asthma were used to examine monthly expenditures and patterns of health care use, including emergency department and hospital use. Children in the FFS program served as controls for trends in asthma care over the study period. Tests examined the potential for selection by program and fixed-effect 2-part model regressions were used to control for differences in program enrollees. Subjects: Children under age 21 with asthma. Measures: Monthly Medicaid expenditures and measures of health service use. Results: We found considerable evidence of quality improvement in patterns of care for children enrolled in both the PCCM and Medical Homes models in NC. After controlling for selection into these programs, use of maintenance as well as rescue medications increased, use of services increased, and emergency department and hospital use went down. Total spending (asthma and nonasthma related) on children in the Medical Homes program was