Its kind of hard to "negotiate" before hand if its an accident.Or acute onset 'suspected' as (fill in the blank)/.Not to mention in that case refusing medical test(diagnostic) can be "called" AMA.Or(against medical advice) in which your insurance has the right to cover none of the bill.IOW if they decide to run a 15,000 scan on you refusing to let them?The entire visit is not covered by your insurance.
That has happened to me before with one of my children.An infant.I felt the test was intrusive under the circumtances.And the fact he had greatly improved since arrival.They threatened that if I didn't allow the test they would report AMA and I would have no insurance coverage for the visit.I told the pediatrician to go stick a cathader up her hole and suck on it...I won.