Travelex Insurance Emergency Medical Benefit Questions

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What illnesses are covered under Travelex’s Emergency Medical and Dental Expense benefit? One would presume that an illness such as a heart attack might be covered, but what about minor illnesses such as a stomach bug? Is a visit to an urgent care clinic allowed or does one need to be treated in an emergency room? Calls to the Travelex customer service department have yielded no useful answers, so any information would be appreciated.