Medicare Providers: Deadlines for Joining an Accountable Care Organization

To participate in an Accountable Care Organization (ACO) for performance year 2025, work with an ACO to join their participant list. ACOs must submit their lists to the Centers for Medicare & Medicaid Services (CMS) by August 1 at:

• Noon ET for the Medicare Shared Savings Program
• 11:59 PM ET for the ACO Realizing Equity, Access, and Community Health Model (ACO REACH)

Participant taxpayer-identification numbers can only appear on one ACO participant list. Resolve any overlaps by September 5.

More information:

• Application Types & Timeline webpage
• Email questions to SharedSavingsProgram@cms.hhs.gov or ACOREACH@cms.hhs.gov