The physician, said Henry Sigerist in 1940, has been acquiring an increasingly social role. For centuries, however, codes of medical ethics have concentrated on proper behavior toward individual patients and almost ignored the doctor's responsibilities to society. Major health service reforms have come principally from motivated lay leadership and citizen groups. Private physicians have been largely hostile toward movements to equalize the economic access for people to medical care and improve the supply and distribution of doctors. Medical practice in America and throughout the world has become seriously commercialized. In response, governments have applied various strategies to constrain physicians and induce more socially responsible behavior. But such external pressures should not be necessary if a broad socially oriented code of medical ethics were followed. Health care system changes would be most effective, but medical education could be thoroughly recast to clarify community health problems and policies required to meet them. Sigerist proposed such a new medical curriculum in 1941; if it had been introduced, a social code of medical ethics would not now seem utopian. An international conference might well be convened to consider how physicians should be educated to reach the inspiring goals of the World Health Organization.