Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Billions of dollars have been spent on pilot programs searching for ways to reduce health care costs. I study one such program, in which hospitals pay doctors bonuses for reducing the total hospital costs of admitted Medicare patients. Doctors respond to the bonuses by becoming more likely to admit patients whose treatment can generate high bonuses and sorting healthier patients into participating hospitals. Conditional on patient health, however, doctors do not reduce costs or change procedure use. These results highlight the ability of doctors to game incentive schemes and the risks of basing nationwide health care reforms on pilot programs.