Managers at The Horton Hospital in Banbury say the Tories were wrong to claim the hospitals's A&E department was under threat of closure.
Conservative leader and Witney MP David Cameron highlighted a number of casualty departments and maternity units, which the Tories suggested could be closed.
But The Horton said its consultation instead recommended "staffing in the emergency department be strengthened, including the appointment of an additional consultant".
The maternity service would be replaced by a midwifery birthing centre, with women expecting high risk deliveries being advised to give birth at the John Radcliffe in Oxford.
West Bromwich Labour MP Tom Watson said: "It seems David Cameron has come back from holiday making accusations before he has checked his facts."
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