The Medicare Shared Savings Program is the largest Medicare accountable-care model. Provider groups form an Accountable Care Organization, are assigned a panel of Medicare fee-for-service beneficiaries, and are measured against a spending benchmark and a set of quality measures over a performance year.

If the ACO delivers care for less than the benchmark while meeting quality thresholds, it earns a share of the savings. In the two-sided tracks the ACO is also on the hook for a share of any losses, which pushes groups toward proactive prevention, keeping patients healthy and out of the hospital, rather than volume.

Winning under MSSP depends on reaching attributed patients before costs spike: booking wellness visits, closing screening and chronic-care gaps, and following up after discharge. Rivvi runs those programs as conversations that book and confirm at panel scale, so the outreach keeps pace with attribution.