RAND, 1200 South Hayes St., Arlington, VA 22202-5050. Recent data suggest that 75% of workers in the United States are offered health insurance through their place of employment, and that more than half these workers are offered a choice of two or more insurance plans (McLaughlin 1999). Choosing a plan is obviously an important personal decision for consumers and their families. In addition, many health policy experts have argued that competition among health plans for subscribers may help contain rising health care costs and promote quality of care (e.g., Enthoven 1978;Dowd, Feldman, and Christianson 1996). Indeed, employers increasingly are demanding that employees take responsibility for their health insurance choices, for instance, by providing financial incentives to choose low-cost plans (Maxwell et al. 1998). Yet efficient competition requires not only that consumers are offered choices among competing plans, but also that they have the skills and information necessary for making informed choices (e.g., Dranove 1993; Scanlon, Chernew, and Lave 1997).To this end, considerable effort has been invested in providing consumers with information on health plan quality. Prominent efforts to collect and disseminate such data include the National Committee on Quality Asssurance's Health Plan Employer Data and Information Set (HEDIS), and the Consumer Assessment of Health Plan Satisfaction (CAHPS ) program sponsored by the Agency for Health Care Policy and Research (now the Agency for Healthcare Research and Quality) (McGee et al. 1999). In addition, several states have published report cards that compare health plans on the results of member surveys or HEDIS measures, and the Federal Employees Health Benefits Program provides HEDIS and CAHPS information on participating health plans.In contrast, with a few notable exceptions, rela-
Inquiry/Volume 38, Spring 200136 tively little attention has been paid to enhancing consumers' ability to understand the potential cost implications of choosing alternative health plans. Each year during open enrollment period, consumers generally receive tables for available plans that list plan characteristics such as premium, deductible, copayments, benefit limits, stop-loss provisions, and rules for out-of-network coverage. However, research confirms that consumers have difficulty integrating these and other health plan characteristics in a way that facilitates meaningful comparisons across plans (e.g., Gibbs, Sangl, and Burrus 1996; Lubalin and HarrisKojetin 1999). This, in turn, limits consumers' ability to assess health plan value (Mechanic 1989).In this paper, we present the results of a study to develop and test the effects of decision-support materials to inform consumers about expected health plan costs. Specifically, we identified two cost presentation strategies outlined in previous research, and we developed decision-support materials based on these two strategies. We then assessed the effects of the decision-support materials on plan choice in a lab experiment, in whi...