- Prof. Geruso's research focuses on developing country health and the regulation of US health insurance markets. In his work on Medicare, he has used publicly available and large-scale administrative datasets to investigate upcoding by physicians and imperfect competition among private Medicare Advantage insurers. His research on sanitation provides the first evidence that that open defecation, practiced by a billion people worldwide, generates large infant mortality externalities. His work has been featured in the New York Times, Bloomberg, and the Economist magazine. His research has been funded by the National Institutes for Health and the Robert Wood Johnson Foundation.
- Working Papers and Ongoing Research
- "Tradeoffs in the Design of Health Plan Payment Systems: Fit, Power and Balance" with Thomas McGuire. Revision requested, Journal of Health Economics.
- "Upcoding or Selection? Evidence from Medicare on Squishy Risk Adjustment" with Timothy Layton
-     In the News: Bloomberg, NPR
- "Does Privatized Health Insurance Benefit Patients or Producers? Evidence from Medicare Advantage" with Marika Cabral and Neale Mahoney
- "Neighborhood Sanitation and Infant Mortality" with Dean Spears
-     In the News: New York Times, The Economist, Five Thirty Eight
- "Sanitation, Disease, and Anemia: Evidence From Nepal" with Diane Coffey
- "Selection in Employer Health Plans: Homogeneous Prices and Heterogeneous Preferences"
- "The Impact of Education on Fertility: Quasi-Experimental Evidence from the UK" with Heather Royer
- "Insurance Fraud in the Workplace? Evidence from a Dependent Verification Program" forthcoming in The Journal of Risk and Insurance, with Harvey Rosen.
- "Racial Disparities in Life Expectancy: How Much Can the Standard SES Variables Explain?" Demography, Springer, vol. 49(2), pages 553-574. 2012.
- Shorter Papers
- "The Many Definitions of Social Security Privatization," The Economists' Voice: Vol. 3: No. 4, 2006. Reprinted in The Economists' Voice: Top Economists Take On Today's Problems. Eds. Joseph Stiglitz, Aaron Edlin, and J. Bradford DeLong. Columbia University Press, 2007, with Don Fullerton.