I just got my BFP today with #3 and have not posted an intro yet, but was lurking and wanted to comment on this. If you can call the office where you will be having this done and ask them if they will provide you with the actual procedure codes they will bill, you can call your insurance with this information and they should be able to pull up the actual codes and let you know if it is covered, at what rate and will you require pre-authorization.
I have had a NT done with each of my pregnancies after having a friend opt to not have one and suffer a tragic situation. It's noninvasive, since its just taking in some of your personal factors and then taking measurements via ultra/sound of the baby. For us, it was not done to determine if we would terminate if there were concerns, it was more about being prepared.