I've never really cared about a diagnoses other than for research about it, if it's what the doctor/therapist says I have. I treat all of my illnesses/diagnoses pretty much the same and either work on making myself more comfortable/in better health, or solving the problem completely (mending a broken leg, for example).

I think sometimes the words we use are just shortcuts, to say, "I have bipolar disorder" takes longer to get across than, "I'm bipolar". I'm all one so if my leg is fractured, I am, in fact, that fractured leg to an extent?