Can my insurance company force me to pay a disputed amount before appeal

My insurance co. only paid a portion of my surgical bill. I told the clinic that I am appealing the partial payment. They want me to pay the rest of the bill now and wait for the insurance co. to pay me back if the appeal is upheld. Can they force me to pay the disputed amount before the appeal
has been answered?

If the answer is yes, what is the minimum amount that can be sent? - Is this your question? Add additional information