There is only a way to check the Medicare allowance for Physician's services. It is a program called the Medicare Physician's Fee Schedule and can be downloaded.
Here is a link to the CMS.gov website. CMS is the Centers for Medicare and Medicaid Services.

https://www.cms.gov/apps/physician-fee-schedule/

Unfortunately, there is not a way to check facility fees, because they are based on diagnosis and location and other criteria. However, you can negotiate with the hospital for deductibles. I once had a $500 deductible due on a $65,000 hospital bill. I saved for it before the procedure I had done, and when the bill arrived, I called and asked if they would take 50%. Without batting an eye, they accepted my offer and I saved $250.

I hope this helps!