Hello friends, I am opening a practice as of July first. A couple of questions: 1. I don't want to buy an A-scan right of the bet and getting an IOL Master is quite expensive at first. What are the options for getting IOL calc in this situation? Send them to ASC or local ophthalmologists for these tests? Any other suggestions? 2. Billing . What's an acceptable rate for an outside billing company? I heard everything from 6 to 10% of collections. 3. Maybe this is a silly question, but what do people do before you get all the provider #? See pts for free? As far as I know you can only retrobill Medicare? Any info on that? Thanks a lot.