Consumer-driven health plans (CDHPs) are built on the assumption that with increased cost sharing consumers will select cost-effective evidence-based care. In this study, the authors explore whether patterns of utilization change after enrollment in a CDHP and whether the pattern reflects a shift toward evidence-based care. The study population is comprised of 18,025 employees and their adult dependents. The analysis uses a schema for categorizing claims data into high-priority (evidence-based care) and low-priority (limited or no evidence-based care) utilization.