Must foreigners join National Health Insurance?

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Yes. Foreigners who stay in Korea 6 months or more are enrolled automatically as local subscribers (since 16 July 2019); students and marriage immigrants are enrolled from entry. Premiums are billed monthly, and unpaid premiums can block benefits and affect visa extension. Employees are covered through their workplace instead. National Health Insurance Service: ▒▒▒ ☎1577-1000.