LABOR claims St George and Sutherland hospitals would have to cope with more than 31,000 extra patients a year if the proposed $7 GP co-payment was introduced.
But the state government accused the Opposition of a "reckless scare campaign".
Opposition Leader John Robertson and spokesman on health Walt Secord released the figures outside St George Hospital with Labor candidates Chris Minns (Kogarah), Steve Kamper (Rockdale), O'Bray Smith (Oatley) and Greg Holland (Miranda).
They said NSW Health modelling showed the co-payment, which was announced in the federal budget but is stuck in the Senate, would lead to a 27 per cent jump in patients visiting emergency departments. An extra 13,095 patients would attend Sutherland Hospital and 18,271 more would go to St George, they said.
Health Minister Jillian Skinner said a GP co-payment had not been introduced and emergency departments continues to offer free public health care.
She said Labor's claims were based on "rudimentary scenarios" developed by NSW Health after public discussion of a potential recommendation in the National Commission of Audit.
"The NSW Ministry of Health has undertaken no detailed modelling on potential impacts since the federal budget," she said.
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