A social security service in Shenzhen must be bound to social health, and then it is necessary to open a referral procedure before going to other top three hospitals.

No need. Shenzhen's first-class social security needs to be bound to social health and then go to other first-class hospitals. There is no referral procedure. There is no restriction on first-class hospitals, and they can directly register for medical treatment. Referral is a kind of medical insurance reimbursement, which means that after seeing a doctor in a local hospital, it is necessary to transfer to a higher level hospital because of limited conditions and medical level.