Reasonable Cost of Medical Bills

The Mississippi Supreme Court issued the following order on a case last Thursday located here.  The order reversed a circuit court judge's refusal to allow a defendant to depose a hospital regarding their fee schedule to show whether certain charges were reasonable and/or necessary.  This potentially opens Pandora's box on an accident case if a defendant wants to go through the expense.  I would expect there to be a bunch of motions in limine filed by both sides on these type issues.