At least that’s the conventional wisdom.
But while observers assume that ACA will improve the health of the uninsured, the link between health insurance and health is not as clear as one may think. Partly because other factors have a bigger impact on health than does health care and partly because the uninsured can rely on the health care safety net, ACA’s impact on the health of the previously uninsured may be less than expected.
To be sure, the insured are healthier than the uninsured. According to one study, the uninsured have a mortality rate 40% higher than that of the insured. However, there are other differences between the insured and the uninsured besides their insurance status, including education, wealth, and other measures of socioeconomic status.
How much does health insurance improve the health of the uninsured? The empirical literature sends a mixed message. On one hand is an important Medicaid study. Researchers compared three states that had expanded their Medicaid programs to include childless adults with neighboring states that were similar demographically but had not undertaken similar expansions of their Medicaid programs.
In the aggregate, the states with the expansions saw significant reductions in mortality rates compared to the neighboring states.
On the other hand is another important Medicaid study. After Oregon added a limited number of slots to its Medicaid program and assigned the new slots by lottery, it effectively created a randomized controlled study of the benefits of Medicaid coverage. When researchers analyzed data from the first two years of the expansion, they found that the coverage resulted in greater utilization of the health care system.
However, coverage did not lead to a reduction in levels of hypertension, high cholesterol or diabetes.