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The Effect of State Medicaid Expansions on Prescription Drug Use: Evidence from the Affordable Care Act

Author

Listed:
  • Ausmita Ghosh
  • Kosali Simon
  • Benjamin D. Sommers
Abstract
This study provides a national analysis of how the 2014 Affordable Care Act (ACA) Medicaid expansions have affected aggregate prescription drug utilization. Given the prominent role of prescription medications in the management of chronic conditions, as well as the high prevalence of unmet health care needs in the population newly eligible for Medicaid, the use of prescription drugs represents an important measure of the ACA’s policy impact. Prescription drug utilization also provides insights into whether insurance expansions have increased access to physicians, since obtaining these medications requires interaction with a health care provider. We use 2013-2015 data from a large, nationally representative, all-payer pharmacy transactions database to examine effects on overall prescription medication utilization as well as effects within specific drug classes. Using a differences-in-differences (DD) regression framework, we find that within the first 15 months of expansion, Medicaid-paid prescription utilization increased by 19 percent in expansion states relative to states that did not expand; this works out to approximately seven additional prescriptions per year per newly enrolled beneficiary. The greatest increases in Medicaid prescriptions occurred among diabetes medications, which increased by 24 percent. Other classes of medication that experienced relatively large increases include contraceptives (22 percent) and cardiovascular drugs (21 percent), while several classes more consistent with acute conditions such as allergies and infections experienced significantly smaller increases. As a placebo test, we examine Medicare-paid prescriptions and find no evidence of a post-ACA effect. Both expansion and non-expansion states followed statistically similar trends in Medicaid prescription utilization in the pre-policy era, offering support for our DD approach. We did not observe reductions in uninsured or privately insured prescriptions, suggesting that increased utilization under Medicaid did not substitute for other forms of payment. Within expansion states, increases in prescription drug utilization were larger in geographical areas with higher uninsured rates prior to the ACA. Finally, we find some suggestive evidence that increases in prescription drug utilization were greater in areas with larger Hispanic and black populations.

Suggested Citation

  • Ausmita Ghosh & Kosali Simon & Benjamin D. Sommers, 2017. "The Effect of State Medicaid Expansions on Prescription Drug Use: Evidence from the Affordable Care Act," NBER Working Papers 23044, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:23044
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    References listed on IDEAS

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    1. Kurt Lavetti & Kosali Simon, 2018. "Strategic Formulary Design in Medicare Part D Plans," American Economic Journal: Economic Policy, American Economic Association, vol. 10(3), pages 154-192, August.
    2. Buchmueller, T.C. & Levinson, Z.M. & Levy, H.G. & Wolfe, B.L., 2016. "Effect of the affordable care act on racial and ethnic disparities in health insurance coverage," American Journal of Public Health, American Public Health Association, vol. 106(8), pages 1416-1421.
    3. Robert Kaestner & Bowen Garrett & Jiajia Chen & Anuj Gangopadhyaya & Caitlyn Fleming, 2017. "Effects of ACA Medicaid Expansions on Health Insurance Coverage and Labor Supply," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 36(3), pages 608-642, June.
    4. Robert Kaestner & Cuping Schiman & G. Caleb Alexander, 2019. "Effects of Prescription Drug Insurance on Hospitalization and Mortality: Evidence from Medicare Part D," Journal of Risk & Insurance, The American Risk and Insurance Association, vol. 86(3), pages 595-628, September.
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    6. Charles Courtemanche & James Marton & Benjamin Ukert & Aaron Yelowitz & Daniela Zapata, 2016. "Impacts of the Affordable Care Act on Health Insurance Coverage in Medicaid Expansion and Non-Expansion States," NBER Working Papers 22182, National Bureau of Economic Research, Inc.
    7. Frean, Molly & Gruber, Jonathan & Sommers, Benjamin D., 2017. "Premium subsidies, the mandate, and Medicaid expansion: Coverage effects of the Affordable Care Act," Journal of Health Economics, Elsevier, vol. 53(C), pages 72-86.
    8. Borrescio-Higa, Florencia, 2015. "Can Walmart make us healthier? Prescription drug prices and health care utilization," Journal of Health Economics, Elsevier, vol. 44(C), pages 37-53.
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    Cited by:

    1. Jacqueline Fiore, 2017. "The Impact of the Affordable Care Act's Medicaid Expansion on Medicaid Spending by Health Care Service Category," Working Papers 1706, Tulane University, Department of Economics, revised Mar 2018.
    2. Sarah Miller & Luojia Hu & Robert Kaestner & Bhashkar Mazumder & Ashley Wong, 2021. "The ACA Medicaid Expansion in Michigan and Financial Health," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 40(2), pages 348-375, March.
    3. Johanna Catherine Maclean & Brendan Saloner, 2019. "The Effect of Public Insurance Expansions on Substance Use Disorder Treatment: Evidence from the Affordable Care Act," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 38(2), pages 366-393, March.
    4. Kim, Seonghoon & Koh, Kanghyock, 2019. "The Effects of the Affordable Care Act Medicaid Expansion on Subjective Well-being," IZA Discussion Papers 12636, Institute of Labor Economics (IZA).
    5. Borgschulte, Mark & Vogler, Jacob, 2020. "Did the ACA Medicaid expansion save lives?," Journal of Health Economics, Elsevier, vol. 72(C).
    6. Johanna Catherine Maclean & Michael F. Pesko & Steven C. Hill, 2017. "The Effect of Insurance Expansions on Smoking Cessation Medication Prescriptions: Evidence from ACA Medicaid Expansions," NBER Working Papers 23450, National Bureau of Economic Research, Inc.
    7. Colleen M. Carey & Sarah Miller & Laura R. Wherry, 2020. "The Impact of Insurance Expansions on the Already Insured: The Affordable Care Act and Medicare," American Economic Journal: Applied Economics, American Economic Association, vol. 12(4), pages 288-318, October.
    8. Jeffrey Clemens & Michael Wither, 2024. "When is tinkering with safety net programs harmful to beneficiaries?," Southern Economic Journal, John Wiley & Sons, vol. 91(1), pages 213-256, July.
    9. Lindsey Rose Bullinger, 2021. "Child Support and the Affordable Care Act's Medicaid Expansions," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 40(1), pages 42-77, January.
    10. Mark Duggan & Atul Gupta & Emilie Jackson, 2022. "The Impact of the Affordable Care Act: Evidence from California's Hospital Sector," American Economic Journal: Economic Policy, American Economic Association, vol. 14(1), pages 111-151, February.
    11. Johanna Catherine Maclean & Benjamin L. Cook & Nicholas Carson & Michael F. Pesko, 2017. "Public Insurance and Psychotropic Prescription Medications for Mental Illness," NBER Working Papers 23760, National Bureau of Economic Research, Inc.
    12. Maclean Johanna Catherine & Cook Benjamin & Carson Nicholas & Pesko Michael F, 2019. "Public Health Insurance and Prescription Medications for Mental Illness," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 19(1), pages 1-25, January.
    13. Seonghoon Kim & Kanghyock Koh, 2022. "Health insurance and subjective well‐being: Evidence from two healthcare reforms in the United States," Health Economics, John Wiley & Sons, Ltd., vol. 31(1), pages 233-249, January.
    14. Jacob Vogler, 2020. "Access to Healthcare and Criminal Behavior: Evidence from the ACA Medicaid Expansions," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 39(4), pages 1166-1213, September.
    15. Jeffrey Clemens & Drew McNichols & Joseph J. Sabia, 2020. "The Long-Run Effects of the Affordable Care Act: A Pre-Committed Research Design Over the COVID-19 Recession and Recovery," NBER Working Papers 27999, National Bureau of Economic Research, Inc.

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    JEL classification:

    • I1 - Health, Education, and Welfare - - Health
    • I13 - Health, Education, and Welfare - - Health - - - Health Insurance, Public and Private

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