Please don't spread misinformation. If you are from/have parents who are from Central America, Puerto Rico, or South America you are a URM. If you are Native American, you are URM. If you are an African American, you are a URM. I don't understand why people still believe the pre-2003 definitions still apply. Not to mention that VAST majority of schools stopped considering only subset of populations URM even before AAMC did.
AAMC Executive Council adopted the following: "'Underrepresented in medicine' means those racial and ethnic populations that are underrepresented in the medical profession relative to their numbers in the general population."
https://www.aamc.org/download/54278/data/urm.pdf
It used to be Only 4 groups, people need to stop spreading misinformation. The AAMC also states in their letter that they encourage SCHOOLS to implement their OWN definitions if they find AAMC to be too restricting. Many schools will consider anyone who is from Central and South America to be a minority and URM.
More evidence: Frequently Asked Questions
What is "underrepresented in medicine"?
In 2003, the AAMC adopted a new definition of underrepresented in medicine. An important feature of this new definition is that it no longer identifies specific populations as underrepresented or as minorities. Rather, it provides a tool for medical schools to build and assess institutional diversity. Race and ethnicity can be one element of a total picture among other components, such as personal attributes, experiential factors, and demographics.
Each medical school determines its own diversity policies using factors which may include race and ethnicity. For example, a particular institution may decide, based on its own mission and goals, that Cuban-born or Latino students would generally serve the diversity interests of the school. The same school may decide that, in addition, its diversity interests are served by encouraging enrollments of students from other traditionally underrepresented groups, such as African Americans and Native Americans.
Medical Minority Applicant Registry (Med-MAR)
Underrepresented in Medicine Definition - Initiatives - AAMC