 Still, it turns out that conserving these medications for the people they were approved to treat is challenging. CVS Caremark's solution involves looking at a patient's history to see whether there's any prior evidence of them having diabetes. 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.