ObjectiveTo examine the relative influence of hospital and skilled nursing facilities (SNFs) on 30-day rehospitalization. Data Sources/SettingsElderly Medicare beneficiaries newly admitted to a SNF following hospitalization. Study DesignWe ranked hospitals and SNFs into quartiles based on previous years' adjusted rehospitalization rates (ARRs) and examined how rehospitalizations from a given hospital vary depending upon the admitting SNF ARR quartile. We examined whether the availability of SNFs with low rehospitalization rates influenced hospitals' SNF readmission rates and whether changes in a hospital's ARR over 3years is associated with changes in the SNFs to which they discharge. Principal FindingsHospital readmission rates from SNFs varied 5 percentage points between patients discharged to SNFs in the lowest and the highest rehospitalization quartiles. Low rehospitalization rate hospitals sent a larger fraction of their patients to the lowest rehospitalization SNFs available in the area. A 10 percent increase in hospital's share of discharges to the lowest rehospitalization quartile SNFs is associated with a 1 percentage point reduction in hospital's ARR. ConclusionsThe SNF rehospitalization rate has greater influence on patients' risk of rehospitalization than the discharging hospital. Identifying high-performing SNFs may be a powerful strategy for hospitals to reduce rehospitalizations.