Manx Care said it was contacting GP practices to verify permanent addresses to all of those affected by the error and had reiterated “the importance of not replacing records” to UK health providers.
Meanwhile, the health body has urged anyone who has been treated in the UK and expected correspondence from Manx Care, to get in touch with their GP practice to “review your records”.
Potential impacts on care could mean people miss or have delayed invitations for routine screenings or appointments at Noble’s Hospital.
Manx Care said that despite the error, patients would not lose their places at their Manx GP practice.
The healthcare body apologised for “any confusion or disruption” and said people’s “health and peace of mind [were] top priorities”.