You can be liable for the "fair market value" of procedures performed out of necessity--such as if you are unconscious and unable to consent. When you checked in you likely signed agreement to their "standard" (and unreasonable) list prices.
$9,000 can be enough of a hole for some people that digging out would never be possible--my rough rule of thumb is that half a year's income in debt is a lost cause, and time for most people to start over in chapter 7.
It may also be possible to negotiate the bill downwards, especially if you are able to make a significant lump sum cash payment.
It is definitely worth consulting with an attorney on this. My assistant can usually get you in within a day or two if you call.
You can dispute any debt, on your credit report or as a defense in Court. Accusations like "misrepresentations" won't get you anywhere, and the reality is that people who have to go to the ER (presumably) come out with big bills, especially when there is no insurance. It isn't like a normal referral from a doctor, when tests can be considered in advance. I can also say from personal experience that sometimes it takes more than one trip in the MRI machine. We don't know what was or was not necessary that day, but it should have been addressed long ago.
I doubt you would get very far with this kind of issue, but if in conjunction with other debts, you feel that bankruptcy may be an option for you, I strongly recommend you consult with a bankruptcy attorney in your area. I am sure that either Mr. Hawkins or another frequent contributor to this forum, Dorothy Bunce, who is also in Las Vegas, could ably assist you.
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If you are already considering bankruptcy for other debt issues, then it may not be worth your while to bother with this debt any more as disputing this will be an uphill battle. If this is in fact your only debt, whether or not you should try to settle it out or file bk is really dependent on your financial circumstances. If you are unemployed or have no income, bk is going to be the easy way to resolve this. The best advice would be to consult in person with a bankruptcy attorney to explore all of your circumstances and options. Good luck.