More than 600 GPs could have their license to practice revoked for failing to provide completed revalidation information.
In April last year the GMC wrote to 54,000 doctors asking them to confirm details on their designated body, as part of the Make your connection campaign.
But 7,818 doctors have not yet responded to the independent regulator, 623 of them general practitioners.
If they fail to respond to the final warning letter this week, the GMC has announced it will “take steps” towards removing their license to practice.
Niall Dickson, GMC chief executive said: “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.”
Over 50% of the doctors written to have overseas addresses, and 15% are over the age of 65 – meaning they may not currently be working in the UK.
Those who have not responded to GMC requests for information need to visit GMC Online to confirm their designated body.