There are undoubted benefits to all the e-health systems our governments are proposing and/or have implemented and there are documented cases of deaths that could have been prevented if doctors and surgeons and nurses had quick, easy access to this information. But, those benefits do not come without risk and the biggest risk is that the information will be stolen. Indeed it's a near-certainty that it will get out.
So, keep as little as possible and encrypt EVERYTHING as much as feasible. And store stuff separately - bank details should never be anywhere near medical claims records.
* - In the context.