Can I make an appeal to my guaranteed income insurance when I get incapacitated due to corona?

When you fall ill with the known symptoms (fever, muscular pain, shortness of breath) and your waiting period* has expired, then the loss of pay due to your incapacity for work is insured according to the policy conditions of the guaranteed income insurance. 

Then you have to submit your declaration as soon as possible, with the necessary documents (e.g. certificate of your mutuality and/or medical certificate).