Below is what I saw from Singapore General Hospital's website.
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Referrals
Primary healthcare doctors and those from polyclinics and other hospitals refer patients who require specialist care to our Specialist Outpatient Clinics.
There are two types of referral:
General Referrals
Your would be on a general referral and seen as a subsidised patient if you are a Singapore resident referred by a government doctor/hospital without reference to a specialist by name.
Private Referrals
You would be on a private referral and seen as a private patient if you are referred to a specialist by name by a government doctor/hospital or referred by a private doctor/hospital, or if you are a foreigner.
