This study examines racial/ethnic disparities in the upper qualties of total health care expenditure finding that Blacks and Hispanics receive disparate care at high expenditure levels, suggesting prioritization of improved access  among minorities with critical health issues.

Lê Cook, B. & Manning, W. G. (2009). Measuring racial/ethnic disparities across the distribution of health care expenditures. Health Services Research, 44(5), 1603-1621. DOI: 10.1111/j.1475-6773.2009.01004.x http://www.hsr.org/hsr/abstract.jsp?aid=44765784392 

Authors: Benjamin Lê Cook, Willard G. Manning.