Medicaid expansion provides more gains in health insurance coverage for married people

New research suggests that, under the United States’ Patient Protection and Affordable Care Act (ACA), expanded Medicaid coverage has provided greater improvements in health insurance coverage for married people, especially women, than for unmarried people. Jim Stimpson of Drexel University, Pennsylvania, and colleagues present these findings in the open-access journal PLOS ONE on October 23, 2019.

Medicaid is a U.S. government program to provide health insurance to people with limited income. The ACA gave U.S. states the option to expand Medicaid coverage for adults, and 25 states implemented expansion by 2014. Since then, health insurance coverage rates have improved more in Medicaid expansion states than in non-expansion states. However, the impact of marital status—a key predictor of other health care access factors—on post-expansion coverage has been unclear.

To help clarify the impact of marital status, Stimpson and colleagues analyzed data on almost 4 million adults who participated in the nationwide American Community Survey from 2010 to 2016. Controlling for various socioeconomic factors, they investigated differences in health insurance coverage according to people’s sex, marital status, and whether they lived in a Medicaid-expansion state.

In general, the data confirmed previous findings that coverage rates overall were higher in Medicaid expansion states. The researchers also found that, after expansion, uninsured rates were 1.6 percentage points lower for married women than for unmarried women (a similar difference was not seen for men). Additionally, Medicaid coverage rates were 2.6 percentage points higher for married versus unmarried women, and 1.8 percentage points higher for married versus unmarried men. Among married people overall, uninsured rates were lower in Medicaid-expansion states than in non-expansion states—unmarried persons have historically been more likely to be uninsured than their married counterparts, and it appears these differences have widened post-ACA.

Since 2014, additional states have expanded Medicaid coverage for adults, and some are still considering expansion. Understanding that Medicaid expansion has appeared to reduce the number of persons, especially married women, with no health insurance could help inform such legislation.

“Gains in health insurance coverage from Medicaid expansion were greater for married persons, especially married women, compared to unmarried persons,” summarizes Stimpson. He notes, in other words, “lack of implementation of Medicaid expansion disproportionately impacted unmarried men and women in states that chose not to expand Medicaid.”

Source:
Journal reference:

Stimpson, J.P., et al. (2019) Association of Medicaid expansion with health insurance coverage by marital status and sex. PLOS ONE. doi.org/10.1371/journal.pone.0223556.

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