I just asked.
Had 5,000$ bill, slowly was paying it down, did about 500$ then quit for 3 years. They never really bother me for it, but i did get a few collection letters from a 3rd party company. I had explained to them WHY i wasn't paying, that i do not believe i owe them a penny since i was lied to.
Anyways, started making some more money, so i gave them a call. They offered to wipe the debt for 2500$ (meaning 2k off total bill). I stated i had 1000$ i could pay now, in full, if that would 100% wipe out the debt. I got put on with a supervisor. He worked out the terms, So 5k down to 1.5k. I requested I get emailed a copy of our agreement before i provided my CC number. That way i wouldn't get called back asking for the rest later. About 6 years later, still not been called back so i guess they held up.
I personally believe anyone who buys a product should pay for it. But in my case the DR office and ins company told me i was covered prior to going in!!! They failed to tell me the 30 blood test wasn't covered. Only the visit. So i had no fuss by not paying up after i KNOW i covered the cost of their lab work.