If I was in your shoes, I'd utilize a mood tracker, (the on PC was very comprehensive last I checked it out)... Anyway I'd chart my moods for a month or more, depending on my symptomatic patterns, and then present them to my service provider and ask for an honest opinion.

I'd even make notes stating how every "hypo" is triggered and short lived... A large part of being dxd BP is due to suffering from random episodes and mood shifts, although triggered episodes do count, as a trigger is more often than not a big thing, for example, my personal ones are death in my family, extreme overwhelm, feeling trapped, and stressed.
Any episodes unrelated to those things are completely random, nothing happens to set them off...

Anyway, my point is, if you go in there with evidence, asking for a clear discussion on what your DX is and why it is, and checking to see if it matches your Mood Tracker, then you might just get some more informative answers.

Maybe it's as simple as the above members have suggested and it's just for billing purposes... But it's a discussion I think that needs to happen, to give you peace of mind.