Many doctors are already sending us electronic sick notes. If this is the case, we will need no other proof from you. If there is a technical problem or your doctor's surgery is not yet using the electronic procedure, please send us the certificate for the health insurance provider as soon as possible, either online via Meine TK ("Krankmeldung online einreichen", only available in German language), the TK-App or by post to:
Techniker Krankenkasse
20902 Hamburg