Enrollment in consumer-directed health plans grew 25% in 2007 to 12.5 million people, according to data reported today by the Blue Cross and Blue Shield Association. CDHPs were defined as high-deductible health plans that include a health reimbursement arrangement or health savings account option. A BCBS survey of adults under age 65 with private health coverage found enrollees with HSA-eligible plans were 30% more likely to track their health expenses than those in more traditional health insurance plans, and 27% more likely to ask their doctors about the cost of treatment. They also were more likely to participate in health or wellness programs, and slightly more likely to have regular check ups and preventive screenings. Collectively, the 39 independent Blue Cross and Blue Shield companies served 4.4 million CDHP members in 2007, up 50% from 2006.