This is an original excerpt written by our team to show structure, depth and referencing. It is modelled on the course named above but is not a university document. Use samples as a study guide and follow your school's academic integrity policy.
The policy question
Does expanding Medicaid eligibility for low-income adults save lives? The question shapes state decisions about expansion and debates over coverage changes. Two influential studies, using different data and methods, address it.
Evidence from earlier state expansions
Sommers et al. (2012) compared three states that substantially expanded adult Medicaid eligibility after 2000 (New York, Maine and Arizona) with neighboring states that did not, examining adults aged 20 to 64 over the five years before and after expansion. Expansions were associated with a reduction in adjusted all-cause mortality of 19.6 deaths per 100,000 adults, a relative reduction of 6.1%. Reductions were largest among older adults, nonwhite adults and residents of poorer counties. Expansions also increased Medicaid coverage, reduced uninsurance, reduced delays in care because of cost, and increased the share of people reporting excellent or very good health.
Evidence from the Affordable Care Act expansions
Miller et al. (2021) linked large-scale federal survey data with administrative death records to compare low-income adults close to retirement age in states that did and did not expand Medicaid under the Affordable Care Act. Expansion was associated with a 0.132 percentage point decline in annual mortality, a 9.4% reduction relative to the sample mean. The effect was driven by fewer disease-related deaths and grew over time.
Appraising the evidence
| Feature | Sommers et al. (2012) | Miller et al. (2021) |
|---|---|---|
| Data | County-level mortality and population surveys | Individual-level survey data linked to death records |
| Population | Adults aged 20 to 64 in three expansion states and neighbors | Low-income adults close to retirement age |
| Design | Difference-in-differences with neighboring comparison states | Difference-in-differences across expansion and non-expansion states |
| Main limitation | County data can't identify who actually gained coverage | Limited to an age group; observational design |
Neither study is randomized, so both rely on the assumption that expansion and comparison states would have followed similar mortality trends without expansion. Their agreement, despite different data sources, time periods and populations, strengthens the conclusion that coverage reduces mortality among low-income adults.
Mechanisms
Plausible pathways include earlier diagnosis and treatment of chronic disease, access to medications for conditions such as hypertension and diabetes, and fewer delays in care because of cost, which Sommers et al. (2012) measured directly. That Miller et al. (2021) found the effect growing over time and concentrated in disease-related deaths fits these chronic-disease pathways.
Implications for nursing advocacy
- Coverage is a population health intervention. Nurses can present this evidence when states consider changes to Medicaid eligibility or enrollment rules.
- Enrollment matters as much as eligibility. Nurses in clinics and hospitals can connect eligible patients to enrollment help.
- Watch for coverage losses. Requirements that make it harder to stay enrolled can undo the gains of expansion, so DNP-prepared nurses can monitor local data on coverage and outcomes.
- Equity. Because benefits were greatest in poorer counties and among nonwhite adults, coverage policy is also health equity policy.
Conclusion
Two strong observational studies, using different methods, link Medicaid expansion with lower adult mortality. For DNP-prepared nurses, the evidence supports advocating for policies that expand and protect coverage for low-income adults.
References
Miller, S., Johnson, N., & Wherry, L. R. (2021). Medicaid and mortality: New evidence from linked survey and administrative data. The Quarterly Journal of Economics, 136(3), 1783–1829. https://doi.org/10.1093/qje/qjab004
Sommers, B. D., Baicker, K., & Epstein, A. M. (2012). Mortality and access to care among adults after state Medicaid expansions. New England Journal of Medicine, 367(11), 1025–1034. https://doi.org/10.1056/NEJMsa1202099
