To enable improved cost control, quality, and access, US health care delivery is moving from fragmented fee-for-service delivery into various innovative integrated models, including accountable care organizations (ACOs), patient-centered medical homes (PCMHs), and bundles, defined as a coordinated group of services for a specific need, administered over a predefined period. These innovations hold promise for patients whose complex care requirements account for the bulk of health care costs and who would reap the most benefit from a coalesced network of care.