What do you mean by social security?

The concepts of internal social security and external social security are mainly related to the reimbursement scope of national medical insurance. Social security refers to the expenses in the three major catalogues of medical insurance, including the expenses in the drug catalogue, the diagnosis and treatment project catalogue and the medical service facilities project catalogue. These expenses can be reimbursed through medical insurance. Besides social security, it refers to the expenses that are not in the three major catalogues of medical insurance. This part of the cost of medical insurance will not be reimbursed, and patients need to bear it in full. Specifically, the medical insurance catalogue includes Class A expenses, Class B expenses and Class C expenses. Class A expenses are fully reimbursed by the medical insurance fund, class B expenses are partially reimbursed, and patients have to pay part of them themselves, and class C expenses are completely self-funded. Therefore, the expenses in social security are the part that medical insurance can reimburse, and the expenses outside social security are the part that medical insurance cannot reimburse.