After a health care claim, providers routinely send out bills. Your insurer will also send out something called an Explanation of Benefits (EOB).
Before paying, you need to review both carefully.
Did you actually receive the services itemized? Note on the EOB the discounts negotiated by your insurer for In Network services. Have you been given proper credit for the deductible and other out of pocket expenses of your plan?
What your provider bills and what your insurer allows may differ substantially. And providers get cranky when they don’t get paid.
Armed with the information from your EOB, you can make arrangements to settle up with your provider.