What you want to ask is "Why does basic medical insurance pay first?" Facilitate the financial management of patients and hospitals. The advance payment of basic medical insurance means that the medical insurance fund can advance eligible medical expenses in advance. Patients need to wait for the process of inspection or audit when they are reimbursed for basic medical insurance. Hospitals can collect medical expenses in advance, and then the medical insurance fund will pay in advance, which is convenient for patients and financial management of hospitals. The implementation of this system is also conducive to protecting the medical rights and interests of patients and promoting the standardized management of basic medical insurance.