What do you cover?

I am with Discovery - not of my own choice, but because I have to be through my employer's broker. I pay a small bucket full of money every month to be on this medical aid. My son had to get tested for ADHD - and I was told that this had to come out of my Day to Day section - so in essence, I have to pay this myself. How on earth to you call yourself a Medical Aid, if you are not willing in aiding with the proper diagnosis of a condition. How is getting tested for ADHD considered a daily occurrence? What exactly is the point of your medical aid?