The national data opt-out is a service that allows patients to opt out of their confidential patient information being used for research and planning.
Please read this link for information regarding the National Data Opt-out:
digital.nhs.uk/services/national-data-opt-out.
Patients can view or change their national data opt-out choice at any time by using the online service at www.nhs.uk/your-nhs-data-matters or by clicking on “Your Health” in the NHS App, and selecting “Choose if data from your health records is shared for research and planning”.