Usually if you are more than 100-150k away from your hospital/treatment/medical team - you should be elligible. Sometimes it depends on the number of Kms covered within a week .....
You'll need your GP to fill in the initial form - and the surgeon/office to fill in the 2nd form ..... print off a heap of both - and throw them on the desk each time you see them ;). keep copies of each signed one before you send them off, too ;) They can be notorious for 'losing them'! (in NSW anyway!)
good luck - if you don't ask, you don't get xx