Overall spending per-enrollee in private health insurance plans, which includes those sold on government-run Obamacare exchanges, grew by 3.2 percent in 2014. Spending by the federal Medicare program, which covers mostly senior citizens, grew by 2.4 percent on a per-enrollee basis, according to Wednesday's report.
And spending per-enrollee by Medicaid, the joint federal-state program that covers poor people, actually fell in 2014, by 2 percent.
But overall spending by Medicaid grew by 11 percent in 2014, a much bigger increase than either the 5.5-percent overall spending increase by Medicare, or the 4.4-percent overall spending increase for people with private insurance plans.
Medicaid's higher spending rate in 2014 reflects how important the program has been for expanding health coverage under the ACA.
About 6.3 million people who were newly eligible for Medicaid entered the program in 2014. As of that year, 26 states and the District of Columbia had expanded their Medicaid programs as encouraged by the ACA to allow enrollment by nearly all poor adults; the remaining states as of 2014 had tougher restrictions on eligibility for the programs.
Largely because the federal government funded 100 percent of the costs of insuring the newly eligible under Medicaid in 2014, the government's share of overall health spending grew to 28 percent in 2014, up from 26 percent the prior year. The federal government's funding of newly eligible Medicaid enrollees is decreasing over time, but by law will go no lower than 90 percent of total costs.
Federal government health spending also increased in 2014 because the government gives subsidies to most enrollees on Obamacare exchanges in order to help pay their monthly premiums, and also gives many such customers assistance paying their out-of-pocket health expenses.