You never state what this doctor actually told the other doctor, but doctors may share information with one another, under certain circumstances. For example, you move to a different city, your new doctor may request older files and whatnot on you from your former office. (if you sign the document in the beginning permitting them to do so, which most people do). Sometimes it is frustrating when doctors do this because it is possible (and very common) for doctors to get information wrong about patients. For example, while I was pregnant, my OB got my file mixed up with some else's, and told the hospital that there might be complications with my delivery because I smoked 2 packs of cigarettes a day throughout my pregnancy, which is absolutely untrue! I was so angry, and embarassed when the hospital asked me about this. All I could do was call my first doctor and tell him about the mistake he reported on me, which he refused to alter. Doctors are often like this, IMO. They contact one another and share (often downtight untruw) information about their patients, and theres often nothing the patients can do about it, undortunately. I hope all the best for your friend.