IDEAS home Printed from https://ideas.repec.org/p/nbr/nberwo/25153.html
   My bibliography  Save this paper

The Impact of Insurance Expansions on the Already Insured: The Affordable Care Act and Medicare

Author

Listed:
  • Colleen M. Carey
  • Sarah Miller
  • Laura R. Wherry

Abstract

Some states have not adopted the Affordable Care Act (ACA) Medicaid expansions due to concerns that the expansions may impair access to care and utilization for those who are already insured. We investigate such negative spillovers using a large panel of Medicare beneficiaries. Across many subgroups and outcomes, we find no evidence that the expansions reduced utilization among Medicare beneficiaries, and can rule out all but very small changes in utilization or spending. These results indicate that the expansions in Medicaid did not impair access to care or utilization for the Medicare population.

Suggested Citation

  • Colleen M. Carey & Sarah Miller & Laura R. Wherry, 2018. "The Impact of Insurance Expansions on the Already Insured: The Affordable Care Act and Medicare," NBER Working Papers 25153, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:25153
    Note: EH
    as

    Download full text from publisher

    File URL: http://www.nber.org/papers/w25153.pdf
    Download Restriction: no
    ---><---

    Other versions of this item:

    References listed on IDEAS

    as
    1. Thomas C. Buchmueller & Sarah Miller & Marko Vujicic, 2014. "How Do Providers Respond to Public Health Insurance Expansions? Evidence from Adult Medicaid Dental Benefits," NBER Working Papers 20053, National Bureau of Economic Research, Inc.
    2. Bladimir Carrillo & Jose Feres, 2019. "Provider Supply, Utilization, and Infant Health: Evidence from a Physician Distribution Policy," American Economic Journal: Economic Policy, American Economic Association, vol. 11(3), pages 156-196, August.
    3. Laurence C. Baker & Anne Beeson Royalty, 2000. "Medicaid Policy, Physician Behavior, and Health Care for the Low-Income Population," Journal of Human Resources, University of Wisconsin Press, vol. 35(3), pages 480-502.
    4. Hahn, Youjin, 2013. "The effect of Medicaid physician fees on take-up of public health insurance among children in poverty," Journal of Health Economics, Elsevier, vol. 32(2), pages 452-462.
    5. Kosali Simon & Aparna Soni & John Cawley, 2017. "The Impact of Health Insurance on Preventive Care and Health Behaviors: Evidence from the First Two Years of the ACA Medicaid Expansions," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 36(2), pages 390-417, March.
    6. Melissa McInerney & Jennifer M. Mellor & Lindsay M. Sabik, 2017. "The Effects of State Medicaid Expansions for Working-Age Adults on Senior Medicare Beneficiaries," American Economic Journal: Economic Policy, American Economic Association, vol. 9(3), pages 408-438, August.
    7. Abadie, Alberto & Diamond, Alexis & Hainmueller, Jens, 2010. "Synthetic Control Methods for Comparative Case Studies: Estimating the Effect of California’s Tobacco Control Program," Journal of the American Statistical Association, American Statistical Association, vol. 105(490), pages 493-505.
    8. He, Daifeng & McInerney, Melissa & Mellor, Jennifer, 2015. "Physician responses to rising local unemployment rates: Healthcare provision to Medicare and privately insured patients," Journal of Health Economics, Elsevier, vol. 40(C), pages 97-108.
    9. Frank Sloan & Janet Mitchell & Jerry Cromwell, 1978. "Physician Participation in State Medicaid Programs," NBER Chapters, in: The Economics of Physician and Patient Behavior, pages 211-245, National Bureau of Economic Research, Inc.
    10. Craig L. Garthwaite, 2012. "The Doctor Might See You Now: The Supply Side Effects of Public Health Insurance Expansions," American Economic Journal: Economic Policy, American Economic Association, vol. 4(3), pages 190-215, August.
    11. Diane Alexander & Molly Schnell, 2017. "Closing the Gap: The Impact of the Medicaid Primary Care Rate Increase on Access and Health," Working Paper Series WP-2017-10, Federal Reserve Bank of Chicago.
    12. Hu, Luojia & Kaestner, Robert & Mazumder, Bhashkar & Miller, Sarah & Wong, Ashley, 2018. "The effect of the affordable care act Medicaid expansions on financial wellbeing," Journal of Public Economics, Elsevier, vol. 163(C), pages 99-112.
    13. 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.
    14. Glied, Sherry & Hong, Kai, 2018. "Health care in a multi-payer system: Spillovers of health care service demand among adults under 65 on utilization and outcomes in medicare," Journal of Health Economics, Elsevier, vol. 60(C), pages 165-176.
    15. Thomas Buchmueller & Sarah Miller & Marko Vujicic, 2016. "How Do Providers Respond to Changes in Public Health Insurance Coverage? Evidence from Adult Medicaid Dental Benefits," American Economic Journal: Economic Policy, American Economic Association, vol. 8(4), pages 70-102, November.
    Full references (including those not matched with items on IDEAS)

    Citations

    Blog mentions

    As found by EconAcademics.org, the blog aggregator for Economics research:
    1. Chris Sampson’s journal round-up for 19th October 2020
      by Chris Sampson in The Academic Health Economists' Blog on 2020-10-19 11:00:05

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Barkowski, Scott & Jun, Dajung & Zhang, Yuting, 2022. "Medicaid Expansion Spillover Effects on Health Care Consumption and Coverage: Evidence from Medicare Administrative Data," MPRA Paper 112178, University Library of Munich, Germany.
    2. Kole Reddig, 2024. "Spillover between Medicare and Medicaid: Evidence from decreasing physician reimbursements," Contemporary Economic Policy, Western Economic Association International, vol. 42(2), pages 223-236, April.
    3. Borgschulte, Mark & Vogler, Jacob, 2020. "Did the ACA Medicaid expansion save lives?," Journal of Health Economics, Elsevier, vol. 72(C).
    4. Shyam Raman & Johanna Catherine Maclean & W. David Bradford & Coleman Drake, 2023. "Recreational cannabis and opioid distribution," Health Economics, John Wiley & Sons, Ltd., vol. 32(4), pages 747-754, April.
    5. Geruso, Michael & Richards, Michael R., 2022. "Trading spaces: Medicare's regulatory spillovers on treatment setting for non-Medicare patients," Journal of Health Economics, Elsevier, vol. 84(C).
    6. Guihua Wang, 2022. "The Effect of Medicaid Expansion on Wait Time in the Emergency Department," Management Science, INFORMS, vol. 68(9), pages 6648-6665, September.
    7. Dillender, Marcus & Jinks, Lu & Lo Sasso, Anthony T., 2023. "When (and why) providers do not respond to changes in reimbursement rates," Journal of Public Economics, Elsevier, vol. 217(C).
    8. Denis Agniel & Jonathan H. Cantor & Johanna Catherine Maclean & Kosali I. Simon & Erin Taylor, 2023. "Insurance Coverage and Provision of Opioid Treatment: Evidence from Medicare," NBER Working Papers 31884, National Bureau of Economic Research, Inc.
    9. Sarah Miller & Norman Johnson & Laura R Wherry, 2021. "Medicaid and Mortality: New Evidence From Linked Survey and Administrative Data," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 136(3), pages 1783-1829.
    10. Dunn, Abe & Knepper, Matthew & Dauda, Seidu, 2021. "Insurance expansions and hospital utilization: Relabeling and reabling?," Journal of Health Economics, Elsevier, vol. 78(C).
    11. Neprash, Hannah T. & Zink, Anna & Sheridan, Bethany & Hempstead, Katherine, 2021. "The effect of Medicaid expansion on Medicaid participation, payer mix, and labor supply in primary care," Journal of Health Economics, Elsevier, vol. 80(C).
    12. Dillender, Marcus & Friedson, Andrew & Gian, Cong & Simon, Kosali, 2019. "Does the healthcare educational market respond to short-run local demand?," Economics of Education Review, Elsevier, vol. 73(C).
    13. Moiz Bhai & Danny Hughes, 2024. "Estimating Self-Selection in Medicare Advantage," Working Papers 2024-009, Human Capital and Economic Opportunity Working Group.
    14. Bjoerkheim, Markus & Sigaud, Liam & Ampaabeng, Kofi, 2023. "The Effect of the Affordable Care Act's Medicaid Expansion on the Mental Health Of Already-Enrolled Medicaid Beneficiaries," Working Papers 12430, George Mason University, Mercatus Center.
    15. Liam Sigaud & Markus Bjoerkheim & Vitor Melo, 2024. "The Hidden Subsidy of the Affordable Care Act," Papers 2407.07217, arXiv.org.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Neprash, Hannah T. & Zink, Anna & Sheridan, Bethany & Hempstead, Katherine, 2021. "The effect of Medicaid expansion on Medicaid participation, payer mix, and labor supply in primary care," Journal of Health Economics, Elsevier, vol. 80(C).
    2. Thomas Buchmueller & John C. Ham & Lara D. Shore-Sheppard, 2015. "The Medicaid Program," NBER Chapters, in: Economics of Means-Tested Transfer Programs in the United States, Volume 1, pages 21-136, National Bureau of Economic Research, Inc.
    3. Johanna Catherine Maclean & Ioana Popovici & Elisheva Stern, 2015. "Health Insurance Expansions and Provider Behavior: Evidence from Substance Use Disorder Providers," DETU Working Papers 1510, Department of Economics, Temple University.
    4. Thomas Buchmueller & Sarah Miller & Marko Vujicic, 2016. "How Do Providers Respond to Changes in Public Health Insurance Coverage? Evidence from Adult Medicaid Dental Benefits," American Economic Journal: Economic Policy, American Economic Association, vol. 8(4), pages 70-102, November.
    5. Dillender, Marcus & Friedson, Andrew & Gian, Cong & Simon, Kosali, 2019. "Does the healthcare educational market respond to short-run local demand?," Economics of Education Review, Elsevier, vol. 73(C).
    6. Hamersma, Sarah & Maclean, Johanna Catherine, 2021. "Do expansions in adolescent access to public insurance affect the decisions of substance use disorder treatment providers?," Journal of Health Economics, Elsevier, vol. 76(C).
    7. Glied, Sherry & Hong, Kai, 2018. "Health care in a multi-payer system: Spillovers of health care service demand among adults under 65 on utilization and outcomes in medicare," Journal of Health Economics, Elsevier, vol. 60(C), pages 165-176.
    8. 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).
    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. Michael DiNardi, 2021. "Affordable Care Act Medicaid expansions and the nurse labor market," Southern Economic Journal, John Wiley & Sons, vol. 88(1), pages 367-398, July.
    11. Dillender, Marcus & Jinks, Lu & Lo Sasso, Anthony T., 2023. "When (and why) providers do not respond to changes in reimbursement rates," Journal of Public Economics, Elsevier, vol. 217(C).
    12. Geruso, Michael & Richards, Michael R., 2022. "Trading spaces: Medicare's regulatory spillovers on treatment setting for non-Medicare patients," Journal of Health Economics, Elsevier, vol. 84(C).
    13. Denis Agniel & Jonathan H. Cantor & Johanna Catherine Maclean & Kosali I. Simon & Erin Taylor, 2023. "Insurance Coverage and Provision of Opioid Treatment: Evidence from Medicare," NBER Working Papers 31884, National Bureau of Economic Research, Inc.
    14. 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.
    15. Sonchak, Lyudmyla, 2015. "Medicaid reimbursement, prenatal care and infant health," Journal of Health Economics, Elsevier, vol. 44(C), pages 10-24.
    16. Kole Reddig, 2024. "Spillover between Medicare and Medicaid: Evidence from decreasing physician reimbursements," Contemporary Economic Policy, Western Economic Association International, vol. 42(2), pages 223-236, April.
    17. Huh, Jason, 2021. "Medicaid and provider supply," Journal of Public Economics, Elsevier, vol. 200(C).
    18. Thomas C. Buchmueller & Sarah Miller & Marko Vujicic, 2014. "How Do Providers Respond to Public Health Insurance Expansions? Evidence from Adult Medicaid Dental Benefits," NBER Working Papers 20053, National Bureau of Economic Research, Inc.
    19. Jeffrey Clemens & Joshua D. Gottlieb & Jeffrey Hicks, 2021. "How Would Medicare for All Affect Health System Capacity? Evidence from Medicare for Some," Tax Policy and the Economy, University of Chicago Press, vol. 35(1), pages 225-262.
    20. Melissa McInerney & Jennifer M. Mellor & Lindsay M. Sabik, 2021. "Welcome Mats and On‐Ramps for Older Adults: The Impact of the Affordable Care Act's Medicaid Expansions on Dual Enrollment in Medicare and Medicaid," Journal of Policy Analysis and Management, John Wiley & Sons, Ltd., vol. 40(1), pages 12-41, January.

    More about this item

    JEL classification:

    • H51 - Public Economics - - National Government Expenditures and Related Policies - - - Government Expenditures and Health
    • I1 - Health, Education, and Welfare - - Health
    • I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets

    NEP fields

    This paper has been announced in the following NEP Reports:

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nbr:nberwo:25153. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: the person in charge (email available below). General contact details of provider: https://edirc.repec.org/data/nberrus.html .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.