My understanding is:<quoted text>
If you lie, lie, lie, can the "private" company throw you off? If they do, who pays your medical bills?
Actually, the first thing that is notified is the IRS. And they don't have to sue. They can attach everything you own without a legal proceeding.
What private insurance company can do that?
If you lie lie lie - YES> Just like in the past. If you purchased a private healthcare policy from United Healthcare and lied on your application. If you go on the exchange now and lie and the Blue Cross insurance company finds out - they can cancel your policy and depending on the lie they can refuse to pay your health care bill.
No they are not going to notify the IRS that they kicked you off. No they are not going to notify the IRS that you lied and they won't pay your health care bill. Its your bill between you and the hospital and or Doctor. The insurance company has no reason to sue you over anything. They are not going to keep track of whether or not you purchase HC insurance from them or someone else. If they find reason to deny your claim based on a lie that is your bill not theirs. The Doctor and the hospital might sue you. But likely they have to have sufficient reason that they would not have provided you that policy for that amount of money had you not lied. Lets say you made a mistake and miss-stated your year of birth by one year. Likely they could not refuse payment.
The IRS has nothing to do with the health care bill you ran up and then walked away from. Just like now you would be responsible for your health care bill.
The IRS comes into play when your file your income tax return. My guess they are going to ask you who your insurance company is and your policy number on form. If you don't have insurance you will get fined for not having any healthcare insurance and the fine likely will be withheld from any refund.