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What is the difference between the first, second and third grades of Shenzhen social security?

It is suggested to choose comprehensive medical insurance, although the proportion and cost of advance payment are higher, because it has advantages in hospital selection, reimbursement scope, outpatient and inpatient treatment. According to Article 7 of the Measures of Shenzhen Municipality on Social Medical Insurance, the employing unit shall participate in the first file of basic medical insurance for its employees registered in this city, and choose one of the first, second and third files of basic medical insurance for its unregistered employees.