How do I know whether I have a refund or balance outstanding after my discharge?

If you have made payment during the stay and your insurer covers the bill in full, any excess amount will be refunded to you when your bill is finalised. On the other hand, if no or partial payment was made during the stay (depending on the eLOG amount), and the claim payout is insufficient to cover the bill in full, you would need to settle the balance outstanding.