This article analyzes some recent results of the regulation of supplementary care, particularly in the period 2000-2006. Three analytical axes were defined: the structure and operation of the sector, the economic regulation and the care model regulation. Indicators were used to analyze the evolution of these three aspects. We come to the conclusion that the adopted regulatory measures brought important advancements in the analyzed dimensions, markedly a greater solidity of the health plan operators and the growth of the sector over the period with an increase of about 30% in the number of beneficiaries. The regulatory measures regarding the care model were innovative and revealed appropriate for inducing new care practices focused on health promotion and disease prevention as well as the introduction of quality assessment mechanisms (Qualification Project). However there is still ground for improvement: in the discussions about the public-private relation; in changes in the care model in the sense of reducing fragmentation of services and assuring integrated care, health promotion and disease prevention; and with respect to competition in the sector.