The Congressional Budget Office now says that the U.S. will spend less on health care in the coming decade than it predicted before Obamacare became law. That means, even with all the spending that goes with the law—Medicaid expansion and health insurance subsidies—it's driving health care costs down. At the same time, it's insuring a lot of people. Nearly 11.7 million people were enrolled in an Obamacare plan through Feb.