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Technical issues have seen a major medical practice cut back on services.
St Mary's Island Surgery in Chatham has warned patients it won't be working at full capacity.
And it is advising people with non-urgent problems to call back after next Tuesday.
It has posted a message on its website and sent out texts to patients about appointments.
NHS Kent and Medway Clinical Commissioning Group has apologised for the problem and explained the cause.
A spokesman said: "We are aware of a technical issue at St Mary’s Island Surgery.
"We are sorry for any inconvenience this has caused and would like to reassure all affected patients that most issues are now fixed and services are working as usual."
The surgery is part of St Mary’s Island Group Practices, which also includes Pentagon Surgery in Chatham, Sunlight Surgery, Balmoral Gardens Green Suite and Twydall Green Surgery, all in Gillingham.
In total it has more than 27,000 people on its books.
The spokesman added: "The problems happened during the switch-over to make sure patient records were ready to be securely transferred between the two providers taking over permanent contracts for the five sites; neither are responsible for the issue.
"We are working with the technical provider to get all services up and running as quickly as possible.
"While the difficulty around online repeat prescriptions is still being looked into for patients who will be transferring to Maritime Health, we ask that if a patient’s repeat prescriptions are due, please can they order their repeat via their pharmacist (if that service is available) or by dropping a note into the practice."