If you are planning to apply for a master's degree in the U.S., but not sure if your chosen degree is STEM-designated or not, then there are ways to know that. The Immigrations & Customs Enforcement has come up with a list which may be referred to in certain ways to know about the STEM designated courses.
Have a look at this short video on what Mr. Patriek Karayil, an MIT graduate and a Former Vice President of U.S. News Global Education, has there to offer as guidance to all the aspiring students.