A total of 7,818 doctors, of which 623 are GPs, have not responded to requests from the GMC to provide information for their revalidation and have been told that their licence is at risk.
These doctors will receive a final notice letter this week, the GMC said, advising that they have 28 days to either confirm their designated body or tell the GMC they do not have one.
If they fail to respond, the GMC will have to take steps to remove their licence to practise, it warned.
GMC chief executive Niall Dickson said: ‘Revalidation has started well. So far we have revalidated more than 18,500 doctors. To help doctors, we are committed to keeping in close contact with them, particularly in these early days.
‘We know that doctors are busy and some may have found it difficult to come back to us with the information we have asked for. We also know that many of the doctors who have not responded are working overseas or have retired so may have chosen not to respond.
‘For those doctors who want to keep practising in the UK, they must get back to us so we can help them with their revalidation. We have a dedicated team ready and waiting to help. All they need to do is call us.’
The GMC said 4,041 of the doctors contacted are overseas and 1,160 are aged 65 or over.