Is there a Dental Financing Aid that can help me pay for my 3 yr old Dental Surgery?

My 3 year old son had dental surgery. I owe money to the Dental Surgery Center. Is there a program that can help me pay this bill, or financial aid, healthcare financing plan. We are not low income. I have insurance, but unfortunally only covered less than half of the amount owed. Right now I'm on disability and can't afford to pay for this bill. I called the surgery center the payment plan they have is $627.50 a mo. for four months. I still can't affort it. I have good credit and don't want this bill to go to collections. Can someone please help me giving me advise. Thanks,
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