Singapore has a world-class healthcare system

In 2000, Singapore’s healthcare system was ranked by the World Health Organization (WHO) as the best in Asia – ahead of Hong Kong and Japan.

In its 2010 report, the World Health Organization ranked Singapore 6th out of the 100 best health systems in the world. Currently, Singapore has 22 hospitals and medical facilities that are accredited by the Joint Commission International (JCI). In general, any type of medical treatment that you may require is available in Singapore at a reasonable cost and high quality of service.
Healthcare infrastruture in Singapore consists of both public and private healthcare facilities with both offering high quality of medical care but generally different level of service and comfort.
Singapore citizens and permanent residents are entitled to subsidized government healthcare services through compulsory national savings scheme whereas foreigners holding various work passes get the health coverage either through their employer or purchase it privately on their own.
Healthcare facilities
Government healthcare facilities are primarily designed to provide subsidised healthcare services to Singaporeans. These facilities consist of a number of government hospitals for inpatient services and numerous polyclinics offering outpatient services.
Charges in public health services are subsidised by the government while in the private hospitals and outpatient clinics, patients pay the amount charged by the hospitals and doctors on a fee-for-service basis.
Private healthcare facilities in Singapore are as good as any in the world with excellent level of medical care and service levels. For non-Singaporeans, the difference in cost between government and private healthcare facilities is negligible.
Private healthcare facilities consist of numerous private clinics offering outpatient services as well as private hospitals. Most of the private hospitals are JCI-accredited.
Healthcare coverage
Singapore citizens and permanent residents are entitled to subsidised healthcare services. The amount of subsidy can range from 50% to 80%. Co-paying the balance of the medical bill is enabled through a compulsory savings scheme called Central Providence Fund (CPF).
If you are a foreigner working in Singapore, you are exempted from CPF contributions. This also means that you do not have access to the government’s subsidised health insurance schemes. 
Despite the day-to-day healthcare services are quite affordable in Singapore even if you don’t have any health insurance. It is still advisable that you consider your health insurance options to safeguard you and your family in the event of any critical illnesses.

Useful link: Singapore Healthcare Schemes and Subsidies