which company would you recommend for parents when they visit for 1 month?
It's totally depend on the Your parents current medical /Known health condition .
Please beware there are many Agents which will not tell you truth whether your parents health condition covered or not simply for sake of Insurance they will give you
So before opting any insurance there is a Questioner , Yes /No type fill that honestly and see whether the options you are looking for is covered or not
In case you find many insurance company qualify, then you can look for who is asking less premium
Good Luck