How to change one old and one small medical insurance designated hospital?

According to the relevant policies and regulations of urban residents' medical insurance (one old and one small), the change of designated medical institutions requires the child himself or his guardian to go to his insured unit with his social security card or valid ID card or household registration book, and there is no time limit. If the child is insured at school, his guardian needs to go to school to handle it. If you are insured at the social security office where your account is located, you need to go through the formalities for change at the social security office.