Health care in the U.S. is expensive; it is therefore imperative (and sometimes required) to have medical insurance for yourself and any dependents with you for the duration of your stay.
Employees of Washington University in St. Louis who are benefits eligible can find information on the university health insurance plan on the Human Resources website.
Employees that are not benefits eligible should obtain insurance before coming to the U.S. There are providers that specialize in coverage for international students and scholars. Contact the OISS for more information.