A series of policy changes in the so-called " big beautiful bill " are undermining the Affordable Care Act marketplace, in ways that may at first seem relatively subtle but which add up to a major change, health policy experts say. That, in turn, has important implications for consumers and the broader health care system for years to come, they said. The law — a multitrillion-dollar package that the Republican-led Congress passed in July — contains a series of administrative measures that make