Oak Street Health, Inc. is engaged in providing a network of value-based primary care centers for adults on Medicare. The Company operates primary care centers serving Medicare beneficiaries. The Company, through its centers and management services organization, combines a care model with patient experience. The Company invests resources in primary care to prevent unnecessary acute events and manage chronic illnesses. It engages Medicare-eligible patients using a community outreach approach. Once patients are engaged, it integrates population health analytics, social support services, and primary care into the care model. It operates through its direct and indirect subsidiaries, primarily Oak Street Health MSO, LLC (OSH MSO). OSH MSO operates as a management services organization and is in the business of providing management and other administrative services to its affiliated physician practice organizations. It operates approximately 170 centers across 21 states.