1. Top spenders among commercially-insured: increased spending concentration and consistent turnover from 2013 to 2015 Author(s): Johnson, Bill, authorRodriguez, Sally, author Publication: Washington, DC : Health Care Cost Institute, February 2018 Subject(s): Financing, PersonalHealth Expenditures -- statistics & numerical dataHealth Expenditures -- trendsDrug CostsForecastingInsurance, Health -- economicsInsurance, Pharmaceutical Services -- economicsPrivate SectorHumansUnited States