Mixed Bag for Health Co-Ops

Many of the nonprofit health-insurance cooperatives created by the Affordable Care Act have enrolled far fewer people than they had hoped, according to figures obtained by a Republican-led House committee, calling into question their viability.

Fourteen of the 23 co-ops reported to the panel that, as of April 1 or later, they had enrolled significantly fewer people than they had projected for 2014 when they obtained $2 billion in federal loans from a fund created under the health law. The shortfalls create steeper obstacles for the plans to succeed and...