Zirui Song, MD, PhD


Changes in Use of Low-Value Services During the COVID-19 Pandemic

April 22, 2022

Use of low-value care services during COVID-19 exhibits substantial heterogeneity but, on average, shows declines similar to the use of high-value services; low-value care use lags behind high-value care use in the rebound phase.

Gatekeeping and Patterns of Outpatient Care Post Healthcare Reform

October 01, 2018

Is specialist “gatekeeping” in modern health maintenance organization (HMO) insurance associated with differences in outpatient care? The study finds that HMO gatekeeping may meaningfully reduce specialist utilization.