I once used it during a campaign in the following way (4th edition, in case things have changed in 5th):
-I had the basic contract, which I never used.
-I also had a contact in a large docwagon clinic (a doctor)
-when I needed some ware installed, if it wasn't too illegal (anything up to R rating), I could go there and have it done no questions asked. In fact, I used them as a street doc and since they already had a sample on file and my medical files, I didn't have to give them to someone else.
-Also after getting shot up once, I went to that hospital and I was treated at a discount (as I had a contract) and again, without questions asked. Very nice given that you get a full hospital service instead of some street doc where you don't even know if he actually is a doctor.