The following list, compiled from WHO sources, shows the start date and type of  system used to implement universal health care in each developed country. Note that universal health care does not imply government-only health care, as many countries implementing a universal health care plan continue to have both public and private insurance and medical providers.

Dates of Implementation
The dates of implementation given are estimates, since universal health care arrived gradually in many countries. In Germany for instance, government insurance programs began in 1883, but did not reach universality until 1941. Typically the date provided is the date of passage or enactment for a national health care Act mandating insurance or establishing universal health insurance.

System Types:
Single Payer: The government provides insurance for all residents (or citizens) and pays all health care expenses except for copays and coinsurance. Providers may be public, private, or a combination of both.

Two-Tier: The government provides or mandates catrastrophic or minimum insurance coverage for all residents (or citizens), while allowing the purchase of additional voluntary insurance or fee-for service care when desired. In Singapore all residents receive a catastrophic policy from the government coupled with a health savings account that they use to pay for routine care. In other countries like Ireland and Israel, the government provides a core policy which the majority of the population supplement with private insurance.

Insurance Mandate: The government mandates that all citizens purchase insurance, whether from private, public, or non-profit insurers. In some cases the insurer list is quite restrictive, while in others a healthy private market for insurance is simply regulated and standardized by the government. In this kind of system insurers are barred from rejecting sick individuals, and individuals are required to purchase insurance, in order to prevent typical health care market failures from arising.