Karen E. Stockley
Department of Economics
NBER Working Papers and Publications
|June 2014||Premium Transparency in the Medicare Advantage Market: Implications for Premiums, Benefits, and Efficiency|
with Thomas McGuire, Christopher Afendulis, Michael E. Chernew: w20208
In the Medicare Advantage (MA) market, private health insurers compete to offer plans with the most attractive premium and benefit package. Medicare provides a subsidy, based on a "benchmark payment rate", for each Medicare beneficiary a plan enrolls. We investigate how this subsidy, the primary policy lever in the market, affects the equilibrium premiums and benefits of MA plans. We exploit variation in benchmark payment rates within plans over time, coming from rebasing years where benchmark changes differed across areas in ways that were plausibly exogenous, to determine empirically how plan premiums and benefit generosity respond to changes in benchmarks. We find that premiums do not respond to changes in the benchmark payment rate on average but that insurers do pass through a portion...