With the scan place i went to for my NT scan, they bill you $75 on the day, then bill medicare for the rest. I got a cheque in the mail from medicare to my address made out to the scan place that i have to take in there. It is for about $98 or something. Same goes for my next scan at 19 weeks.
My blood test i wasnt billed on the day but got a bill in the mail. That was for about $86 or something, we paid it then got a reciept in the mail which i took to medicare and got about $64 back.
So maybe it depends on where you go?