I also don’t have Advantage - just A, B, & D. plus gap supplemental
Coverage through Aetna. I had already met My less than $200 deductible and had no out of pocket costs.

I might ask for detail on why a diagnostic study is more than expensive than a screening study - if that turns out to be the case. And I would ask registration at the hospital why they didn’t notify you of the cost when you registered.

Calling you after the fact for a scheduled study is not typical my experience.