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請問，移民簽證申請人的健康保險，是簽證前買還是登陸美國以後買？

-It seems this rule was suspended by a judge.

See: 

https://www.wenxuecity.com/news/2019/11/03/8825444.html

Just contact NVC to see whether the health insurance is required for the immigrant visa application a couple of days later.