A new analysis finds a large drop in enrollment in Affordable Care Act (ACA) health insurance marketplaces, including Healthcare.gov, this year. The study projects that about 5 million people will lose coverage, reflecting a significant decrease in the number of Americans signing up through the marketplaces. The analysis ties the decline to higher costs for consumers who buy plans through the ACA marketplaces. It points to policy changes and affordability pressures after Congress failed to reach an agreement intended to keep coverage more affordable for marketplace customers. As a result, fewer people are expected to enroll or maintain their current coverage during the year. The reporting describes the projected decline in enrollment as substantial and indicates that cost increases are a central factor behind the drop. Together, the sources present the decline as emerging from marketplace affordability challenges and congressional action—or inaction—related to maintaining assistance or funding levels that affect premiums and out-of-pocket costs for enrollees.