A Northampton care home is among four to stop taking new admissions after concerns about "wider health support" being provided at the centres.
It is understood GP services at all four Shaw Healthcare homes, including Turn Furlong in Rookery Lane, Spring Park, have been withdrawn.
While the authority's specific reasons for taking the decision are still not known, Shaw Healthcare has now chosen to stop taking in any new residents while a deal is hammered out.
A spokeswoman for Northamptonshire County Council, said: “As the result of some recent concerns about wider health support services being provided to these centres, Shaw Healthcare took the decision to suspend new admissions.
"While this is regrettable the council and health partners are in ongoing discussions about the concerns raised and we are actively seeking a resolution to the situation.
“We remain committed to the use of these centres and we recognise the important contribution they play in relation to caring for some of the most vulnerable and frail residents and especially in supporting discharges from hospitals.
"We are hopeful therefore that this matter can be quickly resolved and we can ensure that we are using this key resource effectively.”
Nene Clinical Commisioning Group is the body that commissions GPs in the county.
Alongside Turn Furlong Shaw Healthcare provides respite care to elderly and and vulnerable people at Thackley Green, Corby; Lancum House, Wellingborough and Longlands Specialist Care Centre in Daventry.
Shaw is contracted to provide a range of services at the four centres under a 25-year PFI contract signed in 2003, including respite care for those just discharged from hospital.
A spokeswoman for the company, said: “Shaw has been in positive discussions with Northampton County Council and its health partners and we expect that admissions will be reinstated as soon as possible.”