 If not, which happens about a third of the time, CVS Caremark will require a prior authorization, meaning the doctor will have to explain the prescription before it's covered. Here's Dr. Daniel Necht, chief innovation officer at CVS Caremark. For those prescribers that go ahead and fill out that prior authorization, we're actually, we're rejecting about 84%, meaning that most of those patients are not actually diabetic and there's off-label use.