Makes it illegal for the same person or entity to own both a health insurance issuer and certain health care providers or their management services organizations (MSOs). If common ownership already exists, the owner must divest; federal and state officials can sue to force divestment and to recover revenues. The Federal Trade Commission must write rules to implement the prohibition, and the FTC and DOJ must review and report on divestitures. The ban is explicitly extended to Medicare Advantage and Medicare Part D sponsors beginning in 2026.