As reported here:
In a recent report to Congress, the Centers for Medicare and Medicaid Services said the cost of expansion was $6,366 per person for 2015, about 49 percent higher than previously estimated. ... An estimated 9 million to 10 million people are covered by the Medicaid expansion, and many of the remaining uninsured are likely to be eligible if their states accept. Most of the new Medicaid recipients are low-income adults.