The first 2 visits, the consultation fee might be slightly expensive but how much, best is ring up NUH and enquire. You can also clarify some doubts and if you have any questions, you can also check with the staff who answer the phone. If they are unable to answer you, they will get someone who knows to call you back.
Consultation fee varies according to the doctor you chose. A consultant will definitely charge less than a Senior Consultant.