High health care spending is a top concern for policymakers, advocates and consumers alike. But what is driving our ever-increasing spending? New research provides details about the relative importance of various cost drivers (e.g., unit prices, disease prevalence and intensity, obesity, etc.), both overall and within patient diagnoses groups (e.g., diabetes or heart disease). This research identifies the cost drivers that matter most and actionable information we can use to tackle our high health care spending trend.