Around a fifth of England's GP surgeries are under threat of closure, according to the Conservative party.
The Tories claim that Labour's plans for a "national network of polyclinics" will see over 1,000 GP surgeries close in London, and another 600 surgeries across the rest of the country.
In a speech on the future of the GP to the King's Fund, leader David Cameron attacked Labour for "imposing new polyclinics on local communities despite opposition from doctors”.
He said Prime Minister Gordon Brown was "trying to abolish the family doctor".
Figures show that there are currently 8,261 GP practices in England, of which 1,546 are in London.
Labour wants to introduce at least 150 new polyclinics across the capital.
Polyclinics will combine GPs, dentists, podiatrists and other specialists under one roof.
They will be equipped with x-rays, ultrasound etc and will carry out as much as 50 per cent of the outpatients clinics done at the hospital.
In his speech on Monday, Mr Cameron said: "Communities which have lost their Post Office, their local shops and their local police station, are now going to lose their doctor.
"Of course there are circumstances where GPs coming together in larger practices or larger premises, and offering new services, are entirely welcome.
"What I object to is the Government's policy of imposing polyclinics on local communities without public support and in the face of opposition from doctors."
However, Heath Secretary Alan Johnson has attacked Mr Cameron, saying that he is trying to mislead the public.
Mr Johnson insists that GP services will not be cut.
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