United Lincolnshire Hospitals NHS Trust (ULHT) Board have agreed they want to reopen Grantham A&E 24 hours a day over the winter.
But NHS Improvement has asked that the final decision on the opening be deferred by one month, in order to allow for an independent review of staffing to be carried out.
The Trust has recently employed more doctors, increasing numbers to 22, slightly above the minimum of 21 middle grade doctors needed to safely staff the three A&Es.
NHS Improvement has advised that it expects the review of A&E staffing to be completed within a month. Until then the opening hours will remain 8am to 6.30pm.