Consumer directed health plans (CDHPs) aim to lower health care costs by giving members financial incentives to reduce discretionary care and seek lower-cost providers through the use of tax-favored savings accounts. CDHPs typically have high deductibles and out-of-pocket limits but protect against catastrophic costs. Health savings accounts (HSAs) are owned by employees and portable, while health reimbursement arrangements (HRAs) are owned and funded by employers. Research shows CDHP members are more cost-conscious consumers but there is no clear evidence of adverse selection effects on risk pools.