I don't believe so, but it should be (if not a prerequisite, then requisite in med school itself). That, and a touch of formal logic. Both of those are critical and lacking in various fields, but their absence is underscored by the nature of medicine (where ethics and logic are cornerstones to the art and science of medicine). Just a personal thought (and a slight pet peeve). Plus, they're both fun to think about. Take it if you have the opportunity.