SUMMARY: This brief details changes in insurance coverage and access to care under the Affordable Care Act. About 20 million individuals gained coverage under the law and access to care improved. Despite these gains, more than 27 million individuals are still uninsured, and many others face barriers in accessing care. As a result of the 2016 elections, the future of the ACA is uncertain. As the next Administration and policymakers debate further health system reforms, they should consider the scope of the ACA’s effects on their constituents.