“Management fashion” is a term used to describe the study of how certain management concepts became popular and adopted by organizations. The research aims to evaluate why JCI accreditation is seen as a fashion in the health sector in Turkey and to understand how it is adopted by organizations in response to institutional pressures. The research combines in-depth interviews, content analysis and analysis of certification indicators. The findings of the research show that JCI has become a management fashion in Turkey, and this is the first study to address the issue of JCI as a management fashion from the perspective of institutional theory and is one of the first studies to show that managerial fashion can be studied through certifications.