PPO's system bills customers directly for its providers--Preferred Health Network.
D003195:Computer Communication Networks; D003199:Computer Systems; D006761:Hospitals; D007341:Insurance / Q000379:methods*; D007344:Insurance Claim Reporting / Q000379:methods*; D007348:Insurance, Health / Q000191:economics*; D015141:Los Angeles; D011243:Preferred Provider Organizations / Q000191:economics*