@Baldimo,
If you're in a large enough group, you don't get charged a higher premium for risks like that.
That's how public insurance works in a number of countries. It is a per-person premium, not family history-based premium (that turns out to be almost useless for most).
Large alumni groups are the same - the premium is per person, not by medical history/lifestyle.
I'm involved with some plans with well over 100,000 members. The premium is unrelated to medical history.
Small groups and individuals, the actuaries will take a crack at assessing risk. It's a hopeless game.