Prime Therapeutics — When members don’t take their medicine as prescribed, it can lead to increased hospitalizations and poor health outcomes. For Medicare plan sponsors, nonadherence drives up unnecessary health care costs. And the financial impact doesn’t end there. Adherence measures account for 28 percent of a Prescription Drug Plan’s (PDP) Star ratings. Encouraging adherence and achieving a high Star rating are top priorities, and for good reason. In 2015, plans with ratings of less than four stars will lose out on an estimated $3.47 billion in bonus payments.