The Unite ballot, which could lead to strike action, will begin on 28 October and closes on 12 November.
Following the ballot's closure, and if members are in agreement, the union will have 28 days to take action.
According to Unite, 95% of its members reject the government’s pay deal which is worth a 7.9% rise over three years, from this April.
Dave Fleming Unite’s national officer for health, said: ‘We are confident of a decisive ‘Yes’ vote for industrial action.
‘There is a real danger that this government policy of falsely depressing public sector pay could continue for many years to come – we can’t allow this to happen.’