GPC Wales has reacted by renewing calls for a 'Welsh factor' to top up quality pay.
The losses have increased from around £4,700 on average in 2005/6, GP leaders say. They are the result of separate calculations for each UK country to weight quality pay for disease prevalence.
Practices have to work harder to achieve an average score because disease prevalence is high in Wales. The effects of high disease prevalence on pay in Wales are greater than in Scotland or Northern Ireland because list sizes are also high.
GP leaders dropped calls for a Welsh factor last year because a directed enhanced service for IT was agreed as a compromise source of additional pay.
But GP leaders say a Welsh factor is now vital after the DES was scrapped for 2007/8.
GPC Wales chairman Dr Andrew Dearden said that provisional national prevalence data for 2006/7 showed that Wales had about 15 per cent more patients on disease registers than England, up from 10 per cent in 2005/6.
'The gap is widening,' Dr Dearden said. 'Whether we have reached the true figure is difficult to know - the gap may continue to grow. It is vital that this is addressed.'
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