That is an unfortunate situation. I suggest you call and speak to someone in their billing department or go in directly to discuss the situation with them. Do not wait for them to call you back. If your insurance company is willing to take a resubmission, they should handle that for you, or give you the appropriate information so that you can do it yourself. Options beyond that depend on how much time and effort you want to put in to dealing with it. Do a cost-benefit analysis.
Tara provided great guidance. Go in person and discuss with billing/accounting. They should handle the resub or basically do it for you and let you actually send it. Best of luck
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I agree with the previous answers. The only thing I would add is that it might be beneficial to follow up any and all phone calls with a letter documenting your position in the dispute. Keep a copy of any letter(s) that you mail in case the matter ends up in court.
If something isn't in writing -- it probably won't be helpful if the dispute turns into a lawsuit.
Contact your insurer directly and file a grievance. And let them know you will file a complaint with the Department of Managed Health care if they do not resolve the problem promptly.