In Germany it is obligatory for students of all nationalities to be member of a health insurance company. Without proof of membership, you will neither be allowed to enrol nor obtain your residence permit!
https://www.fau.tv/series/welcome-day-s25/6-health-insurance-s25?
a) Students from countries which have an agreement on social insurance with Germany,
e.g. the EU countries, Bosnia and Herzegovina, Serbia, Montenegro, Croatia, Turkey, Macedonia and Tunisia will be exempted from joining a German health insurance company, since their insurance coverage from their home country is accepted. However, in order to profit legally from this exemption, you have to go to the
Allgemeine Ortskrankenkasse (AOK)
Studentengeschäftsstelle
Keßlerplatz 16
90489 Nürnberg
phone: +49 (0)911 / 58 68 50 0
or the
Techniker Krankenkasse (TK)
Südwestpark 65
90449 Nürnberg
phone: +49 (0)911 / 24 25 623
or
DAK Nuremberg
Spittlertorgraben 13
90429 Nuremberg
phone: +49 (0)911 / 93 777 80
Please note: a travel insurance is not sufficient – it only covers emergency cases/ accidents!!!!!