They would surely charge a king's ransom because the uninsured include many high-risk people. Insurance is already severely overpriced. This is grossly inefficient. More time overall is spent on collection than on delivering health care. Furthermore, rather than reaping the benefits of competition, our system's purchasing methods actually conflict with standard good business practices.
Capital costs are also uncontrolled, so prices are also higher here for durable medical equipment.
Other countries lower costs by bulk purchasing of goods through a unified purchasing system. In the U.S. there is instead a piecemeal, uncoordinated purchasing system. This allows producers rather than buyers to dictate prices. Individual companies invest in areas they think will be profitable and they don't invest unless they see profits on the horizon. As they compete for markets and profits, instead of cooperating to meet health system needs, there is duplication of services, equipment and construction.