McGill requires all international students and their accompanying dependants to participate in the compulsory health insurance plan, which is administered by International Student Services. The cost of the International Health Insurance for the Summer 2016 term is $302. The coverage runs from May 1 to August 31, 2016. For more information about the coverage, please consult the online Blue Cross Handbook: 
McGill International Health Insurance 2015-2016
However, if you are not registered in a degree program, then you might be eligible for an exemption. In order to receive a refund please refer to the Exemptions section.