Public relations is a form of communication that ensures the long-term goals of creating a positive image that is created on the basis of long-term good relations with different groups of the public: consumers, employees, suppliers, shareholders, government and other formal and informal groups in society. Access to information is a fundamental democratic principle and the right of all citizens in modern democracies, which enables the development of a transparent and open public authority, strengthens public sector accountability, promotes user-oriented public administration, suppresses corruption and increases the legitimacy of institutions and citizens' confidence in government. The right of access to information is a citizen's right guaranteed by international and domestic documents, the realization of which includes the obligation of state bodies to publish information regardless of the submitted request and the possibility of accessing information through the user's request. In addition, it is an extremely important tool for achieving transparency in the work and decision-making of public authorities at all levels, strengthening accountability and fighting corruption. Public authorities are obliged to enable the exercise of the right of access and re-use of information and the fulfillment of other prescribed obligations. The action of a public authority is under the control of the Information Commissioner, and the decisions of the Information Commissioner, as an independent body, are subject to review by the High Administrative Court of the Republic of Croatia. This paper presents the activities of the Public Relations Service of the Croatian Health Insurance Institute during 2012, 2013, 2015 and 2017.