An insurance contract dispute could mean that thousands of people won't be able to use Atlanta-based Grady Hospital for medical treatment in a few weeks. Grady Health System, which runs the hospital, will no longer participate in the Peach State Health Plan Network. Officials said while the contract between the state and Grady ends, patients can continue to receive services at Grady Hospital until the end of the year. Officials said they've been in talks for months, but no agreement was reached.