How many types of medical devices do antigens belong to-can they be invoiced in a small range?

Antigens belong to three types of medical devices. Antigen is a test method, and you can test it at home. The antigen is mainly used to detect novel coronavirus, and it can be quickly judged whether you are infected with novel coronavirus through detection, and it belongs to one of the three types of medical devices, so the antigen belongs to the three types of medical devices. Can make out an invoice