Health insurance exchanges created to help millions of people find coverage are turning into money-losing ventures for many insurers.
The nation's largest, UnitedHealth Group Inc., could lose as much as $475 million on its exchange business this year and may not participate in 2017. Another major insurer, Aetna, has questioned the viability of the exchanges. And a dozen nonprofit insurance cooperatives created by the law have already closed, forcing around 750,000 people to find new plans.