Preferred Provider Organization plans, commonly known as PPOs, are a popular healthcare plan option. PPO plans have built a network of healthcare providers that accept your insurance. You are still able to visit providers who work outside of the network, but you’ll have less coverage support with them.A noticeable advantage to PPO plans is that you don’t have to be referred to a specialist. As long as the provider is in the network, you can schedule an appointment and be covered.