My hubby and I are on Medicare with Ins. backup. I had an MRI 2 months ago for my back and no co-pay. He went yesterday for his MRI as prelim to an upcoming operation and had to pay $175.00 co-pay. Same insurance, different DR. What's up with this? I am waiting for a call back from the Ins. company, see if they can explain this one. However, both DR's. say "you have 15 minutes ask me anything you need to know" and we just pay one co-pay.