The Times explains:
The number of uninsured Americans has fallen by an estimated 15 million since 2013, thanks largely to the Affordable Care Act. But a new survey, the first detailed study of Americans struggling with medical bills, shows that insurance often fails as a safety net. Health plans often require hundreds or thousands of dollars in out-of-pocket payments — sums that can create a cascade of financial troubles for the many households living paycheck to paycheck.
Read more here.