Reduce drug spend using medical claims analytics
Things depend upon the dataset we have on hand here. See what observations you can grab from them using combination of different features. 

If i were to approach this problem, first i would find what kind of patients go to their physicians (Age, area of living, insurance plan, previous diseases, previous admissions, income zone etc). Then would analyse which outpatients facilities serves in which area, their average charges &amp; other features you can find.

After the above analysis i would go with prediction algorithm so to make a theory that an particular set of groups will visit that facility. And using that deduction along with clustering (what i have in mind is 2 clusters 1 going to physicians &amp; other with outpatient facilities) i will select the overlapping clients (I mean the ones who have features similar to lower cost going site but prefer higher cost sites) of insurance company to move towards lower cost site. 

Reason behind using predictive model is because it will help you in predicting the future customers, just normal clustering will just work with the current data. So to make it effective for future i would go with predictive model -> clustering model.