To preface, obviously you want to do all your own research to be informed and blah blah blah but...
...will doctors tell you if you're not covered for something (NT Scan for example) or do they just do it and you find out who covers the bill after the fact?
Re: Doctors & Insurance
Nope.
I got billed a $50 copay for my first ultrasound. I didn't know until after the fact. I called my insurance company and they said I did have a copay. I told them I never did before (uh, I was, like JUST pregnant) and they said I did. Well, I DIDN'T!
I had already had my NT Scan and asked her if I'd be billed for that (I wasn't last time). They said they didn't know and wouldn't know until they got the bill.
If I get billed, I'm calling again. Ugh, insurance.
My doctor and her staff have a lot of people with my insurance, so they have a general idea of what is covered/what is not. They told me at my 10w5d appointment that if I wanted the NT scan they would have to get it authorized by insurance or the cost would be over $1,000. Within 20 minutes they had it authorized. I'm not sure what they did, but now it is covered.
That being said, I have visited other doctors before (non-pregnancy related) that didn't say anything at all. I did things during the appointment because they were asking me to, and once I received the bill I thought, "Well, I wish I would have refused that."
I called my insurance company to have a general idea about what is covered and not. They were very helpful and if I have any questions I would call again.
I recommend calling and not counting on the doctor to tell you.