No, supplementary insurance is generally not compulsory. Unlike basic insurance, which is a legal obligation in some countries, including Switzerland, supplementary insurance is voluntary. It is up to you to decide whether or not to take out supplementary insurance.
Basic insurance covers the fundamental medical services that are considered essential. Supplementary insurance offers additional benefits that go beyond the scope of basic insurance. They enable insurance cover to be extended on an individual basis and adapted to personal requirements. Individuals can decide for themselves whether they wish to cover additional benefits such as private hospital treatment, dental treatment, alternative medicine and other extras with a supplementary insurance policy.
It is worth exploring the various options and factoring personal requirements into the decision.