Turning off patient facing services and changing clinical system
Information on helping patients reconnect to App services and error codes following a change in clinical system
Inform us that you are changing clinical system or merging practices in advance.
The App connects to the main prescribing cost centre ODS code of the practice.
It doesn’t connect to branch ODS codes.
When two practices merge, they will move to one main prescribing cost centre ODS code.
Change in clinical system: 3C error code
If the patient doesn’t reconnect to the App, they will see a 3C error code. A 3C error means the user cannot connect their NHS App to the GPs computer system to mirror their online account.
Verification
Route 1 – Video
Route 2 – PIN document
If the user verifies their identity by video, they will reconnect to the new online account created on your system. If no online account is recreated, the user will have nothing to reconnect to.
If the user has manually entered their PIN document into the NHS App, they will need to reconnect to the new system with a new PIN document.
How the NHS App team can help
Inform us that you are changing clinical system or merging practices in advance.
We can prepare a tailored response for if a 3C error is reported to inform the user of potential downtime and what to do in the meantime.
This include asking patients to:
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email the practice directly to order their prescription
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phone directly to book an appointments
The NHS App service desk does not have the authority or ability to view or advise about data migration when changing clinical system or merging practices. Please contact your system supplier.
Last edited: 18 September 2025 2:48 pm