There are currently 53 health insurance providers operating in Switzerland (in 2017). That is 4 less than in 2016.
Switzerland has a decentralized health system. Most health insurance companies began as local initiatives designed to suit the needs of specific groups of people, and many Swiss health insurers still operate primarily within certain regions.
In recent years there has been a trend towards consolidation, with many smaller insurance providers being absorbed by larger insurance companies.
More on this topic:
Swiss health insurance comparison