What is it and when to act?
Every employee in Germany must have health insurance. Most are covered by the GKV (statutory system). Tell your employer the name of your chosen insurer before your first day — otherwise you’ll be enrolled automatically.
Common mistakes
I didn't choose and was automatically enrolled with AOK. Not a disaster, but TK has a better app and English-language support. I had to wait a year before I could switch. Check the Zusatzleistungen before you start.
I assumed DAK and TK were the same. TK offers a free online interpreter at the doctor and support in English — crucial for newcomers in the first few months. Compare the service, not just the premium.