Hospitals and health systems are rolling out more tools that analyze and crunch data to try to improve patient care--raising questions about when and how it's appropriate to integrate race and ethnicity data. Racial data has grown more complicated as the U.S. becomes increasingly diverse, with a growing number of Americans identifying with more than one race or ethnicity. The number of Americans who identify with at least two races has doubled over the past decade, according to last year's U.S. census, which takes place every 10 years. The Census Bureau started letting people identify as more than one race in 2000, according to the New York Times. That's a demographic shift that executives should keep top-of-mind as the healthcare industry moves toward being more data-driven.