Public reporting of clinical outcomes data is but one response to calls for increasing transparency in health care. Cardiac surgical operations are among the most commonly performed complex operative procedures. Riskadjusted cardiac surgery mortality rate data for individual cardiac surgeons are currently available for -- CORRECTION REQUIRED HERE -- 1;25% of the U.S. population as well as for Great Britain and Ireland. Although cardiologists are the primary source of referral of patients for cardiac surgery, surveys of cardiologists and analysis of market share data indicate this information is not being used to refer to cardiac surgeons with the lowest mortality rates. We review the ethical principles that should obligate cardiologists to discuss and use outcomes data, when available, in selecting cardiac surgeons to whom they refer their patients.