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Major problems within the U.S. healthcare system have been reported including the inability to deliver continuing and coordinated services. Several primary care models have been proposed as a solution to these system failures and many studies have been conducted to investigate their effectiveness. Findings are inconclusive. Using the Medical Expenditures Panel Survey, we investigate the effect of primary care models on healthcare services utilization and costs. Rather than investigating the effect of systems as whole as in previous studies, we focus on the main systems components. This paper presents the initial findings.