If enrollment on the exchanges is set at about six million beneficiaries, which is the enrollment figure predicted by the Congressional Budget Office in February, Tomczyk said the prospects for stability in the new exchanges could be good. "The bigger the pool, the higher the probability that you will have younger and healthier people coming in," she said, adding data from the exchanges over the next few weeks will make the picture clearer. "The big question, if it really is six million, is what do they really look like? How old are they, for example?"
At the Centers for Medicare & Medicaid Services, the federal agency working to launch and stabilize the exchanges, officials reacted gleefully Friday to government data showing individual enrollment in the exchanges had crossed the 6 million mark. "The Affordable Care Act is working," a CMS spokeswoman said. "More than six million Americans have signed up for private insurance through the Marketplace, and we're continuing to see a nationwide consumer surge in demand for Marketplace coverage. We only expect this demand to increase in the coming years."