how many citizens use the health insurance marketplace 
as of 2021 more than 13 million citizens are enrolled in coverage offered by the aca s marketplace 13the bottom linethe patient protection and affordable care act aca was passed in 2010 and is commonly known as obamacare it extended healthcare coverage to millions of previously uninsured americans the aca launched the health insurance marketplace through which eligible people may find and buy health insurance policies all aca compliant health insurance plans including those sold through the marketplace must cover several essential health benefits the aca has continued to evolve through three presidencies 