An EPO is a plan design very similar to a PPO, except that it does not provide out of network benefits. If you see an out of network doctor you will be subject to the entire bill the physician charges with no help from insurance. If you have an EPO plan make sure to check that any doctors you see *participate in your network.
*Participate is the terminology used for doctors that have made contracts within your network. Always know if a doctor participates in your network, and use the exact word PARTICIPATE.