As of Wednesday, Northeast Georgia Health System is out-of-network with UnitedHealthcare, leaving thousands in the area concerned about their ability to get affordable local medical care. The two organizations had been in contract negotiations for more than eight months, according to information on the health system’s website www.nghs.com/united. “We are disappointed that we were not able to reach a new contract with Northeast Georgia Health System,” Tracey Lempner, spokeswoman for United, wrote in an email.