Hospitalisation Deposit

My due date is in 3 weeks time. I am a subsidised patient at SGH. I have chosen class B2 upon admission and was told that I need to pay $692 as cash deposit. If i am not able to fork out this sum of money during admission will I be able to seek for financial assistance? I wasn’t aware that subsidised patient still need to pay deposit during admission. I thought only private patient in class A and B1 need to pay. Thats the reason why i change from private patient to subsidised patient.