Sorry if this is off topic but you might find it useful.
We may be talking about different schemes, I found this from google.

1. The Universal coverage scheme (also called the gold card scheme) is overseen by the National Health Security Office and was formerly known as the 30 baht project. Care is now free for a patient registered with his/her local health service. Both public and some private hospitals participate in the scheme, and receive an annual capitation payment from the NHSO for each enrolled member. The house registration document is used to establish eligibility.
http://www.nhso.go.t.../index_main.jsp


2. The Social Security Scheme (in Thai bpragan sangkhom) covers people who pay employment-based contributions and is administered by the Social Security Department of the Ministry of Labour. Many westerners join this scheme, and coverage can be maintained after employment has ended by paying a modest monthly contribution. A member normally has a choice from a short list of local public and private hospitals Coverage is fairly comprehensive, but a private hospital may have different tracks for SSS and private patients.

http://www.sso.go.th.../eng/index.html