My mania was triggered by taking an antidepressant, so I'm not sure I would have been diagnosed otherwise either. I would say I am remission right now since I haven't had an episode in over seven years. But I take meds for bipolar, so I guess I wouldn't say I'm in full remission.
I've never even been told am "in remission," though. My pdoc only has said I have "surprisingly not had any episodes in a long time."
So, I am suspicious of any "bipolar in full remission" diagnosis, but I could be convinced that it does exist, I think.

If I remember, then I'll ask my pdoc the next time I see her.