The Affordable Care Act’s (ACA) expansion of Medicaid to low-income adults is preventing thousands of premature deaths each year, a landmark study finds.[1] It saved the lives of at least 19,200 adults aged 55 to 64 over the four-year period from 2014 to 2017. Conversely, 15,600 older adults died prematurely because of state decisions not to expand Medicaid. (See Figure 1; see Table 1 for state-by-state estimates.) The lifesaving impacts of Medicaid expansion are large: an estimated 39 to 64 percent reduction in annual mortality rates for older adults gaining coverage.

The new research fills a void, using a novel dataset to document sizable declines in mortality that smaller surveys could not detect. But its findings are consistent with a large body of research that has already documented that Medicaid expansion improves access to care and health outcomes.[2] For example, research shows that Medicaid expansion increased the share of low-income adults using medications to control chronic conditions like heart disease and diabetes. […]

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