通常便宜的保险是不包括pre-existing condition的,但是保其他的
非pre-existing的sickness的。
这里有个保险的比较,在美国的coverage是比较麻烦。 http://www.globalhealthcover.com/options.htm
cover while visiting the US & Canada
expacare Up to 90 days* per policy year
global ultracare Up to 90 days per policy year
Global 400 Emergency cover only
Goodhealth Emergency cover only
Allianz Elite Emergency cover only