You can choose to have your information not included, it's an opt out system.
Form is here:
http://www.connectingforhealth.nhs.uk/systemsandservices/scr...
Form is here:
http://www.connectingforhealth.nhs.uk/systemsandservices/scr...
Read about the correct opt-out form here: http://optout.care-data.info/
And not to mention that you need to know about it in the first place.