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Objective: The Affordable Care Act (ACA) introduced reforms to mitigate adverse selection into and within the individual insurance market. We examined the traits and predicted medical spending of enrollees in California post-ACA.Data Sources: Survey of 2,103 enrollees in individual market plans, on- and off-exchange, in 2014.Study Design: We compared actual versus potential participants using data from the 2014 California Health Interview Survey on respondents who were individually insured or uninsured. We predicted annual medical spending for each group using age, sex, self-rated health, body mass index, smoking status, and income.Principal Findings: Average predicted spending was similar for actual ($3,377, 95 percent CI [$3,280-$3,474]) and potential participants ($3,257 [$3,060-$3,454]); however, some vulnerable subgroups were underrepresented. On- versus off-exchange enrollees differed in sociodemographic and health traits with modest differences in spending ($3,448 [$3,330-$3,565] vs. $3,175 [$3,012-$3,338]).Conclusions: We did not find evidence of selection into the overall insurance pool in 2014; however, differences by exchange status reflect the importance of including off-exchange enrollees in analyses and the pool for risk adjustment. California's post-ACA individual market has been a relative success, highlighting the importance of state policies and outreach efforts to encourage participation in the market. [ABSTRACT FROM AUTHOR]

High deductible-based health insurance plans require consumers to pay for care until reaching the deductible amount. However, information is limited on how well consumers understand their benefits and how they respond to these costs. In telephone interviews, we found that consumers had limited knowledge about their deductibles yet frequently reported changingtheir care-seeking behavior because of the cost. Poor knowledge limited the effects of the deductible design, with some consumers avoiding care for services that were exempt from the deductible. Consumers need more information and decision support to understand their benefits and to differentiate when care is necessary, discretionary, or unnecessary. [ABSTRACT FROM AUTHOR]