(Reuters) - The hack at UnitedHealth's tech unit has led to uncertainty around when high medical costs for health insurers will subside as the cyberattack leads to prolonged delays processing insurance claims, Wall Street analysts said.

While UnitedHealth said most of its pharmacy services operations, which were also taken down in the Feb. 21 attack, are expected to come back online as early as Thursday, the company has said its medical claims network will take longer to be restored.