Thousands of nurses could appeal against their new pay banding under the Agenda for Change (AfC) system, according to the Amicus union which represents many nurses.
The union estimates that between 10%-20% of nurses are expected to appeal against the initial decision, but the actual figure may be a lot higher.
Neither the government nor the health service unions are keeping a tally of reviews nationally.
NHS Employers, the pay and conditions negotiating body, predicted that about 5% of staff would go to the evaluation panel stage which follows an unresolved review.
City Hospitals Sunderland NHS Trust, one of the early adopted of AfC, has had 1,800 out of a total of 5,000 staff seeking a review.
NHS Employers described this as “unusual”.