What does "Pflichtversichert" mean?

If you are a freelancer, or if you make over 60 750€, you are compulsorily insured (Pflichtversichert). This means that public health insurance companies must accept you.

When you are not Pflichtversichert, you are voluntarily insured (freiwillig versichert). Public health insurers do not have to accept voluntarily insured people.