This article is the best available discussion of known data available for U.S. tort research. The paper describes the various datasets useful for cross-sectional research, both generally and for specific types of civil litigation, including medical malpractice. The authors also discuss in some detail the limitations of each dataset, and the overall data limitations in this field.
Eric Helland, Jonathan Klick, and Alexander Tabarrok, 19 J. Econ. Perspectives 207-220 (Spring 2005)