As pointed out here when Obamacare was being debated, a central part of the plan was actually just an expansion of a 1960s program known as Medicaid. It is also turning out to be highly successful.
Vox - Obamacare's Medicaid expansion will cover millions more Americans than initially expected, new Congressional Budget Office projections estimate.
Last year, CBO estimated that an average of 14 million low-income Americans would rely on the Medicaid expansion for coverage over the next decade. Now the forecasting agency expects that the program will have an average enrollment of 18 million.
More Medicaid enrollees means more federal spending; the additional 4 million Medicaid patients are expected to drive up the cost of the insurance expansion by $146 billion.