Legacy Health is entering the health insurance market with Springfield-based PacificSource Health Plans. Legacy is purchasing a 50 percent stake in PacificSource for $100 million. PacificSource will set up a new nonprofit organization that will own the other 50 percent interest in the current health insurance company. The partnership with Legacy will give PacificSource a provider network to support its growth and will allow Legacy to continue a focus on health care transformation and population health. More information.