The challenges of transitions among medical care settings and clinicians have received increasing attention. Over the last decade, the Centers for Medicare & Medicaid Services has made minor revisions to hospital reimbursement rules designed to penalize hospitals for discharging patients prematurely to postacute settings. However, the length of hospital stay has continued to decrease, and rehospitalization rates have increased.3 ,5 It is no surprise, then, that the Affordable Care Act has multiple provisions designed to reduce rehospitalization. In the next year, the Centers for Medicare & Medicaid Services is charged with developing penalties for health care organizations whose patients are rehospitalized “too often.” Whether hospitals or the postacute care organizations will be penalized has not yet been specified, but this provision of the law has raised anxiety levels throughout the acute and postacute care sectors. Two strategies are proposed to increase clinical accountability for transitions: one, the creation of accountable care organizations (ACOs), composed of consortia of hospitals, physician groups, and other health care organizations designed to serve populations of patients within a global budget; and the other, “bundling” Medicare acute and postacute payments.7 Regardless of organizational form, how hospitals, their medical staffs, and postacute referral sources will collaborate to share the payment bundle and reduce rehospitalizations is the subject of considerable speculation.