Discovery Health
3 Pvt hospitals in area not 1 on Discovery network

I stay in the Pretoria East area, within a 5-7km radius we have 3 excellent private hospitals namely, Die Wilgers (1km from me), Pretoria East (6km from me) and Faerie Glen (4km from me). A question for Discovery, I am on a fairly good medical plan (Classic Delta Saver) why are none of these hospitals on the Discovery Network? The closet on the network is the Little Company of Marie (15kms from me).

So I need to trek from the East to fairly close to the Pretoria CBD.