What happened when Tianshui First Hospital went through the discharge formalities and asked for the ICBC card number?

The reasons for asking the ICBC card number when going through the discharge formalities are as follows:

Because you have been hospitalized, because hospitalization may cost more money, and there are expenses such as eating at your own expense. It is more convenient to pay the bill when going through the discharge formalities with the bank card, otherwise it is inconvenient to bring a lot of cash, and it will be troublesome to lose it.