After practices on MPIG reported that their correction factors had been cut inexplicably, the GPC said an error had occurred in the Exeter payments system.
But GPC chairman Dr Laurence Buckman last week accepted there had been no error, and said practices had misinterpreted financial statements.
'A large number of practices noticed their correction factor fall. Initially we thought it was an Exeter error. We now know that is not the case,' he said.
GPC deputy chairman Dr Richard Vautrey said: 'When you drill down, it was as the statement of financial entitlements was intended. Some practices may have had a fall in their global sum equivalent, but only due to their list size.'
However, accountants said that some correction factor payments were miscalculated and PCTs have offered refunds.
Laurence Slavin, from medical accountants Ramsay Brown and Partners, said the situation was 'very odd'.
'Brent PCT has admitted a mistake was made and agreed to refund affected practices,' he said.
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