Insurance Claim Denial: surprise medical bill after insurance

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Illustrative scenario prepared by my practice.
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Hypothetical question

EDIT: added more context below. I've been trying to resolve this on my own but I'm stuck.

surprise medical bill after insurance. I've been dealing with this for about 5 weeks now and the situation isn't improving.

I have already tried to resolve this directly but the other party is not cooperating.

What's the typical outcome in situations like this?