Health insurance is a special case. Here, as a legally insured person, you can choose from a variety of insurance companies the health insurance company that best suits you. The general contribution rate is the same for all health insurance companies. However, some health insurance companies still require an additional contribution, which is paid in equal parts by the employee’s employer. The average additional contribution was 1. percent in 2018.
Health insurance is another special case in another respect: from a certain annual income, you are not obliged to be a member of a statutory health insurance company. You have to take out insurance, but you can also join a private health insurance company. This is possible in 2019 from an annual income of 60,750 euros gross. However, since a switch from a private back to a statutory health insurance company is not easily possible, this step should be done carefully.
Source: https://www.make-it-in-germany.com/de/jobs/sozialversicherung/deutsche/