How do I dispute a hospital bill?

Question Details: I have an outstanding medical bill from a hospital visit. I filled out a workers' compensation form but my boss said there was no proof so he did not sign it and I let it go. The insurance that I had at the time should have picked up the bill but didn't. Now I have to pay the full amount. How do I dispute the letter? I was covered under my insurance so they should pick up the bill, right?

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