This is something to be aware of any time you hand over your insurance card or your credit card, or type any information into a computer you do not own. Digital information can be shared easily, with the click of a button. That is what makes it so convenient. The question of how to ensure that your data is safe is complicated, but a few simple principles are usually worth following.
DON'T access your medical information any public Wi-Fi access. Even if you are accessing your information from the doctor's "secure portal". Remember that nothing is "secure" unless your own internet access is secure also. If you're checking the results of your blood tests from a laptop at Starbucks, you might as well post them on your Facebook page.