According to US law, insurance companies can lawfully differentiate individual health insurance premiums on the basis of non-genetic medical information, but not on the basis of genetic information. The article reviews the case for such genetic exceptionalism. First, I critically assess some standard justifications. Next, I scrutinize an argument appealing to the view that genetically based premium differentiation expresses that persons do not all merit equal concern and respect. In the final section, I argue that even if genetic exceptionalism is unjustified, there is a forceful luck egalitarian argument against basing premiums on genetic risks, to wit, that this tends to make some individuals worse off than others as a result of the bad brute luck involved in having a genetically determined, above-average risk of developing health problems.