Undergraduate students enrolled in 18 units (or more) are automatically registered for the MSU Health and Dental insurance plans. The premium for each plan is included in the supplementary fees concurrent with tuition. If a student can demonstrate comparable coverage, perhaps with a parent’s plan, a spouse’s or via employment, a student may opt-out of one or each of the MSU administered plans.
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https://www.msumcmaster.ca/posts/380