New analysis from Avalere finds that while exchanges have succeeded in enrolling very low-income individuals, they continue to struggle to attract middle and higher income enrollees.

Specifically, as of the close of the 2015 open enrollment period, exchanges using HealthCare.gov had enrolled 76 percent of eligible individuals with incomes between 100 and 150 percent of the federal poverty level (FPL) or $11,770 to $17,655. However, participation rates declined dramatically as incomes increase and subsidies decrease. For instance, only 16 percent of those earning 301 to 400 percent FPL picked coverage through an exchange, even though they may be eligible for premium subsidies.

“People receiving more generous subsidies are expected to enroll in the exchanges at higher rates. However, participation levels decline as incomes increase, even among individuals who would be eligible for both premium subsidies and cost-sharing reductions,” said Elizabeth Carpenter, director at Avalere.