The medical is not so much a medical to ascertain the fitness or suitability of the immigrant to live in the USA, it is mainly a screening for diseases that the USA does not want to expose its residents to from the immigrant population. These are “communicable diseases of public health significance” as defined by the CDC.
The list of diseases currently (October 2016) is:-
- Hansen’s Disease (Leprosy)
This list might be updated from time to time and can be found here:
In addition, the physician is responsible for checking the vaccinations of the immigrant to meet the list of vaccine preventable diseases – also linked above. This latter list will not cause denial however, as long as someone is vaccinated.