The collection agency will be no help. They get a cut of whatever they collect.
I want to say seven years is the limit, but I could be wrong.
I would start with the doctor's office. You'll probably need to talk to the old insurance company as well. I'd be tempted to tell them to go take a hike, but I admit I don't know what the possible repercussions could be. If they can't be bothered to send you a single statement in six years, they don't deserve to be paid.
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