HEDIS site

http://www.opm.gov/insure/health/hedis2002/9G.asp

HEDIS (Health Plan Employer Data and Information Set) is developed and maintained by the National Committee for Quality Assurance, a not for profit organization committed to assessing, reporting on, and improving the quality of health care. We present HEDIS results on managed care plans to:
allow consumers to reliably compare health plan performance, and
spur the health plans to make internal efforts at quality improvement.