In my country health insurance will ask about the diagnosis plus want a more in depth report from the therapist after one year of sessions. When my T had to write that he told me about my diagnosis. That was the only time it was mentioned and I don't think we've ever focused on it more. I'm not sure whether my T tells other people earlier and whether he just doesn't like to tell people they have BPD. I think I was mostly told because he wanted to make sure I agree with what he will put in the report.