According to the insurance inquiry, the large-scale mutual medical insurance for employees, referred to as large-scale medical insurance for short, refers to the system that medical expenses incurred by people participating in large-scale medical insurance for urban employees in their cities in special disease clinics are reimbursed by the basic medical insurance co-ordination fund according to regulations, and the accumulated expenses above the deductible line and within the maximum limit throughout the year are paid by the large-scale medical insurance fund according to regulations, which can effectively reduce the burden of large-scale medical expenses for insured employees.