When things don't “ad” up

So, a patient comes to you needing whatever. He expects his insurance to cover the treatment, and so does your office. Therefore, you go ahead and treat him. Not too far down the road, everybody realizes that the insurance company will not cover the services rendered. You refuse to give the patient any more appointments until he pays the fee due for services already rendered. He disappears and ultimately reappears after an extended period of time, having dutifully worn whatever you gave him. Bad things have happened because of the unmonitored and unsupervised appliance wear.

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