I'll offer my dissenting opinion--

Yes, it does matter when you're talking about BP vs Sz -- but only to a small degree. BP involves severe mood dysregulation. While Sz can involve mood dysregulation as well (typically depression from what I understand), mood stabilizers aren't a "standard" form of treatment for Sz. However, that doesn't mean someone with Sz can't benefit from a mood stabilizer. Mood stabilizers are used in people with autism to treat aggression, even though mood stabilizers are indicated for bipolar. But symptoms wise, Sz and BP are different and I think they need different methods of treatment in therapy. Medication is another story, but if you've found a cocktail that makes you feel better, then it doesn't matter what your diagnosis is. You want to treat the symptoms, not the label. But therapy speaking, yeah, it does matter. It also may matter for insurance purposes in terms of what medications your insurance will cover for you. For example, they may not cover a mood stabilizer anymore, so keep an eye out for that. You may need to appeal their rejection if they give you a hard time.