Affirmative action is under increasing scrutiny. In medicine, the obse
rvation that minority physicians disproportionately serve minority pat
ients has been one rationale for affirmative action. Using two large p
hysician surveys, we find that minority and women physicians are much
more likely to serve minority, poor, and Medicaid populations. Weaker,
but significant association exists between physician and patient soci
oeconomic background. Service patterns are sustained over time and are
generally consistent with physician career preferences. Ending affirm
ative action in medicine may imperil access to care. Results do not su
pport affirmative action based on economic disadvantage instead of rac
e, ethnicity, and sex.