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Health Insurance Reform and HMO Penetration in the Small Group Market

  • Thomas C. Buchmueller

We use data from several national employer surveys conducted between the late 1980s and the mid-1990s to investigate the effect of state-level underwriting reforms on HMO penetration in the small-group health insurance market. We identify reform effects by exploiting cross-state variation in the timing and content of reform legislation and by using mid-sized and large employers, which were not affected by the legislation, as within-state control groups. While it is difficult to disentangle the effect of state reforms from other factors affecting HMO penetration in the small group markets, the results suggest a positive relationship between insurance market regulations and HMO penetration.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 11446.

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Date of creation: Jun 2005
Date of revision:
Publication status: published as Buchmueller, Thomas C. and Su Liu. “Health Insurance Reform and HMO Penetration in the Small Group Market.” Inquiry 42, 4 (Winter 2005/2006).
Handle: RePEc:nbr:nberwo:11446
Note: HC
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  1. Ai, Chunrong & Norton, Edward C., 2003. "Interaction terms in logit and probit models," Economics Letters, Elsevier, vol. 80(1), pages 123-129, July.
  2. Rothschild, Michael & Stiglitz, Joseph E, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, MIT Press, vol. 90(4), pages 630-49, November.
  3. Monheit, Alan C. & Steinberg Schone, Barbara, 2004. "How has small group market reform affected employee health insurance coverage?," Journal of Public Economics, Elsevier, vol. 88(1-2), pages 237-254, January.
  4. David M. Cutler & Sarah J. Reber, 1998. "Paying For Health Insurance: The Trade-Off Between Competition And Adverse Selection," The Quarterly Journal of Economics, MIT Press, vol. 113(2), pages 433-466, May.
  5. Dranove, David & J. Simon, Carol & White, William D., 1998. "Determinants of managed care penetration," Journal of Health Economics, Elsevier, vol. 17(6), pages 729-745, December.
  6. Rhema Vaithianathan, 2004. "A Critique of the Private Health Insurance Regulations," Australian Economic Review, The University of Melbourne, Melbourne Institute of Applied Economic and Social Research, vol. 37(3), pages 257-270, 09.
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