JM Lim, Hummy Song, Julius Yang. 2024.
Published in Management Science.
Second Place, POMS CHOM Best Paper Competition, 2022.
Selected for presentation at MSOM Healthcare SIG, 2021.
We examine how hospitals' use of off-service placement (placing patients in units designated for another specialty) affects not only those placed off service themselves but also patients who are placed on service. Using an estimation strategy that combines the Heckman correction procedure and a heteroskedasticity-based identification approach, we find that a 10-percentage-point increase in the level of off-service placement during a patient's hospitalization leads to a 10.9% increase in length of stay. Through a series of counterfactual analyses, we propose alternate routing and capacity-planning policies.
JM Lim, Ken Moon, Sergei Savin. 2023.
Published in Management Science.
Winner, MSOM Student Paper Competition, 2021.
Selected for presentation at the Wharton Workshop on Empirical Research in OM, 2021.
Using a dynamic equilibrium model and structural estimation methods, we quantify how hospitals invest in quality improvements under CMS's Hospital Value-Based Purchasing (VBP) Program. Our counterfactual analyses show that increasing the size of the incentives from 2% to 4% would have generated an additional US$1.2B in quality investments from 2011 to 2018, leading to a 3.3% reduction in the average rate of central-line associated bloodstream infections (CLABSI). We also show that applying the yardstick incentives to tailored hospital peer groups, even without changing the size of the incentives, can reduce the rate of CLABSI by 1.4% among hospitals facing the highest costs of quality investment.