请问有人了解绿卡要求的健康保险是什么吗

绿卡主页有这么一句：“If you are granted a residence permit, you must take out a full health insurance covering you and any accompanying family members until you are covered by the Danish National Health Insurance.”

持绿卡签证赴丹的人，在拿到黄卡之后，是不是就能 covered by the Danish National Health Insurance，享受丹麦国民的普通医保了？
在此之前要求持有的健康保险，可以是几个月的旅行险吗？