NBER Working Papers by Boris Vabson

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Working Papers

October 2015The Efficiency Consequences of Health Care Privatization: Evidence from Medicare Advantage Exits
with Mark Duggan, Jonathan Gruber: w21650
There is considerable controversy over the use of private insurers to deliver public health insurance benefits. We investigate the efficiency consequences of patients enrolling in Medicare Advantage (MA), private managed care organizations that compete with the traditional fee-for-service Medicare program. We use exogenous shocks to MA enrollment arising from plan exits from New York counties in the early 2000s, and utilize unique data that links hospital inpatient utilization to Medicare enrollment records. We find that individuals who were forced out of MA plans due to plan exit saw very large increases in hospital utilization. These increases appear to arise through plans both limiting access to nearby hospitals and reducing elective admissions, yet they are not associated with any meas...
March 2014Who Benefits when the Government Pays More? Pass-Through in the Medicare Advantage Program
with Mark Duggan, Amanda Starc: w19989
Governments contract with private firms to provide a wide range of services. While a large body of previous work has estimated the effects of that contracting, surprisingly little has investigated how those effects vary with the generosity of the contract. In this paper we examine this issue in the Medicare Advantage (MA) program, through which the federal government contracts with private insurers to coordinate and finance health care for more than 15 million Medicare recipients. To do this, we exploit a substantial policy-induced increase in MA reimbursement in metropolitan areas with a population of 250 thousand or more relative to MSAs just below this threshold. Our results demonstrate that the additional reimbursement leads more private firms to enter this market and to an increase in...

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