The purpose of the work is to research the marketing aspects of the Croatian Health Insurance Fund in online environment, website satisfaction and possibilities to improve the Croatian Health Insurance Fund website. Moreover, the goal is to explore the adaptation options and usefulness of the public health insurance web system in Croatia, Serbia, Bosnia and Herzegovina and Slovenia, as well as to compare and evaluate their quality parameters. The aim is to compare the websites of public health insurance in Croatia and the surrounding area. When evaluating and asking for opinion of the website users, specific issues were taken, important for obtaining a specific point of view of the respondents. Based on the results of the survey, we can assess the Croatian Health Insurance Fund as successful in maintaining communication, up-to-dateness, quality of information and ease of access. Analyzing the Nibbler tool pages, compared to the surrounding countries, it is at the top, in the second place. The methods of induction, deduction, analysis and synthesis were used. The limitations of the research are the sample size on which the survey result is made and the limited range of indicators on the basis of which the website quality evaluation and individual evaluations of certain indicators are made on the Nibbler search engine. The advantage of research is speed because both the survey and site review work over the Internet. Considering that the amount of content and website up-to-dateness can be considered the most important parameters, the www.hzzo.hr website can be rated very high. Also, taking into consideration that the website has experienced immeasurable growth in popularity in the last three months, we can conclude that the website has recognized the users’ needs and that with minimally invasive corrections it can be repaired and completely improved.