One of the most frustrating pains I have in life is that when I visit the doctor / dentist, even with insurance, it's difficult for me to understand exactly how

One of the most frustrating pains I have in life is that when I visit the doctor / dentist, even with insurance, it's difficult for me to understand exactly how much I'll end up paying and whether or not it's reasonable. It's difficult to comparison shop doctors, since pricing information is not published, and complicated to calculate what is/isn't covered. I'm interested in finding (or building) a platform that can tell me 1) how much a particular procedure would cost me with my insurance plan and 2) whether the price the doctor is going to charge me is reasonable. I think the former could come from publicly available coverage policies of all major payers/plans and the latter could come from user/community input (similar to Glassdoor). Does anyone know if something like this exists?