Growth in Medicare Advantage has become increasingly difficult to sustain. Acquisition costs are rising, competition is intensifying, and members are more willing than ever to switch plans in search of better value. A study found that 15.6% of Medicare Advantage members changed plans within one year after enrollment, and 49.2% changed plans after five years.   For many organizations, the traditional growth model of driving enrollment while offsetting ongoing member losses is no longer sustainable.  Retention is the missing…