Medicaid expansion and opioid overdose mortality among socioeconomically disadvantaged populations in the US: A difference in differences analysis

• Published in: Drug and alcohol dependence 2022-04, Vol.233, p.109381-109381, Article 109381
• Main Authors: Ibragimov, Umedjon, Mansfield, Russell W., Yarbrough, Courtney R., Cummings, Janet R., Livingston, Melvin D., Haardörfer, Regine, Beane, Stephanie, Fadanelli, Monica M., Haley, Danielle F., Cooper, Hannah L.F.
• Format: Article
• Language: English
• Subjects: Adult; Adults; Analgesics, Opioid - therapeutic use; At risk populations; Averages; Difference-in-difference modeling; Disadvantaged; Drug overdose; Education; Educational attainment; Government programs; Humans; Medicaid; Medicaid expansion; Mortality; Multivariable control; Narcotics; Opiate Overdose; Opioid epidemic; Opioid overdose-related mortality rates; Opioids; Overdose; Overdoses; Patient Protection and Affordable Care Act; Population studies; Quasi-experimental methods; Sociodemographics; Socioeconomic status; Socioeconomics; Statistical analysis; Underreporting; United States - epidemiology; Vulnerable Populations
• ISSN: 0376-8716; 1879-0046
• DOI: 10.1016/j.drugalcdep.2022.109381

Opioid-related overdoses are a major cause of mortality in the US. Medicaid Expansion is posited to reduce opioid overdose-related mortality (OORM), and may have a particularly strong effect among people of lower socioeconomic status. This study assessed the association between state Medicaid Expansion and county-level OORM rates among individuals with low educational attainment. This quasi-experimental study used lagged multilevel difference-in-difference models to test the relationship of state Medicaid Expansion to county-level OORM rates among people with a high-school diploma or less. Longitudinal (2008–2018) OORM data on 2978 counties nested in 48 states and the District of Columbia (DC) were drawn from the National Center for Health Statistics. The state-level exposure was a time-varying binary-coded variable capturing pre- and post-Medicaid Expansion under the Affordable Care Act (an “on switch”-type variable). The main outcome was annual county-level OORM rates among low-education adults adjusted for potential underreporting of OORM. The adjusted county-level OORM rates per 100,000 among the study population rose on average from 10.26 (SD = 13.56) in 2008–14.51 (SD = 18.20) in 2018. In the 1-year lagged multivariable model that controlled for policy and sociodemographic covariates, the association between state Medicaid Expansion and county-level OORM rates was statistically insignificant. We found no evidence that expanding Medicaid eligibility reduced OORM rates among adults with lower educational attainment. Future work should seek to corroborate our findings and also identify – and repair – breakdowns in mechanisms that should link Medicaid Expansion to reduced overdoses. •Compared opioid deaths among less educated people by state’s Medicaid expansion.•States that expanded Medicaid had higher adjusted rates of opioid deaths.•No evidence that Medicaid expansion influences opioid death rates in less educated.