As federal lawmakers continue to debate whether to repeal, and perhaps eventually replace, the Affordable Care Act (ACA), it is clear that Republican health care proposals would significantly scale back a key feature of the ACA: allowing states to expand Medicaid for adults up to 138 percent of the federal poverty line. This policy decision should be informed by a thorough accounting of the ACA’s Medicaid expansion’s effects. In this post, we present new evidence that the ACA