What does supplementary insurance other than social security mean?

Insurance Bian Xiao helps you answer, and more questions can be answered online.

It is legal for the employer to participate in the five insurances for employees. As for supplementary medical insurance, it is obviously insurance other than social security medical insurance and is not mandatory. Supplementary medical insurance can be commercial medical insurance, or it can be a system of reimbursement by employers at their own expense.