PPO USA Medical PPO USA's large and proven medical network offers substantial cost savings and excellent access to medical services from participating providers in hard-to-cover cities and states: If you would like to contact Client Relations call 877-254-5481 or use the web tools below: Find a PPO USA Medical provider by name or provider location and specialty. Print a PPO USA Medical Directory for the state you live in. Nominate a Provider. We will invite your doctor to join our network.