Health science courses ARE considered all others. They're different than BCPM because they're not bio, chem, physics, or math. It kinda sucks for HS majors (or engineering, etc) because a lot of the classes probably should be included under the BCPM umbrella, in my opinion. Not surprisingly, AO includes, well, all the other classes, and your AO gpa includes everything from art to health science to basketweaving. The course classification shows up on your app, so adcoms will be able to see what types of courses you took.
Classify health science classes as HEAL, i think it's called. If they don't like it, they'll change it. Chances are, though, by the course title it'll be pretty obvious where they fall. "Other" is for weird classes that cover stuff that isn't any of the main categories.
Your AO gpa is all lumped together, so communications, econ, health sci...all in there. That's actually a good thing if you have bad grades in a few HS classes, because it can be balanced by good grades in others.
The online course description should be ok to use to defend your classfication. You have to do that little button thing on the AMCAS site for changing academic something-or-other. Somebody else can talk more about that, because they didn't change anything on mine so I don't know.