No passbook? Without a medical insurance passbook, there is no personal account. Employees who participate in hospitalization medical insurance for serious illness do not have personal accounts. (For example, archivists and rural registered employees only participate in hospitalization medical insurance, because the payment ratio is different from that of other employees, so individual accounts are not established. )
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.