Two organizational employment models, two different legal employment statuses of physicians engaged in general practice / family medicine (concessionaires or employees of state-owned health centres), along with a dual method of financing of the work performed, within which physicians who are concessionaires receive income based on performance and those who are employees of state-owned health centres receive a fixed salary regardless of the results, affect the efficiency and quality of healthcare services. The aim of this paper is to examine the differences in the level of success in attaining indicators pertaining to healthcare services provided under mandatory health insurance, depending on the organizational employment model of physicians. For the purpose of the research, we used data from the database of the Croatian Health Insurance Fund (HZZO) for contractual teams for general practice / family medicine (parallel data on the performed diagnostic and therapeutic procedures (DTP) and data on the quality and success indicators as defined by HZZO). Results obtained point to a statistically significant difference in the quality indicators of provided healthcare services with respect to the legal employment status of physicians (concessionaires have more success in achieving the targeted standards). These results are influenced by personal satisfaction dependent upon monetary incentives, age and education-related structure of concession teams, and the quality of equipment in the office facilities, all of which points to the conclusion that family medicine urgently needs reorganization, in order to achieve a more harmonized quality level of services on the territory of the whole Republic of Croatia.