Here are some good UK references if you are working in the UK:-
The Good Practice Guidelines for GP electronic patient records v4 (2011) Department of Health (DH)/Royal College of General Practitioners (RCGP)/British Medical Association (BMA).
Joint Guidance on Protecting Electronic Patient Information British Medical Association / NHS Connecting for Health.
Records Management: NHS Code of Practice (2nd Edition) DH/Digital Information Policy.
Electronic Health Records (EHR): Guidance for Community Pharmacists and Pharmacy Technicians November 2012.