A majority of the variation seen in U.S. hospitals' readmission rates for heart attack, heart failure, and pneumonia can be explained by where hospitals are located, a new Commonwealth Fund–supported study finds. Writing in Health Services Research, researchers led by Jeph Herrin at the Health Research and Educational Trust find that a number of community factors—especially a greater number of general practitioners per capita relative to specialists, and the availability of high-quality nursing home care—are most strongly associated with lower rates of readmission within 30 days of discharge.