Preferred Provider Organizations (PPOs) are a type of managed care organization that provides healthcare services to its members through a network of healthcare providers. PPOs negotiate discounted rates with healthcare providers in exchange for a larger patient pool. Members of a PPO have the flexibility to choose their healthcare providers, including specialists, without needing a referral from a primary care physician. PPOs typically offer a range of healthcare services, including preventative care, diagnostic tests, and treatment for acute and chronic conditions. PPOs are often offered as an employee benefit by employers or purchased by individuals.