In a PPO you get most of your health care from a network of providers, just as you do in an HMO. But you can choose to go outside of the network and pay more. Some Medicare Advantage plans are PPOs, for people with Medicare. There are also Medicare Advantage HMOs.
Primary care doctor: You can have a primary care doctor in a PPO, and it is often advisable to have one, but you do not have to. You can go to a specialist and get other services without seeing a primary care doctor first.
Networks and medical groups: Like HMOs, PPOs have a network of doctors and other providers. However, you can choose to see providers who are not in the network. You usually pay a higher cost to see these providers.