Yes, because ~1/3 of those who match into IM residencies each year are FMGs. Almost universally the only visa offered by US residencies is the J1.
However, under the Conrad 30 program, J1 visa holders who wish to remain in the US after residency may convert their J1 visa into a H1B visa. This program allows FMGs to waive the “must return home for 2 years” requirement of the J1 on the condition that they work for 3 years in federal designated medically underserved area. (Typically at a FQHC.)
This program brings many physicians, dentists and nurses to rural and low income inner city urban areas which US citizen healthcare providers find unattractive and where they generally will not work.
BTW, 1/3 of current practicing US dentists are graduates of foreign dental schools so the issues surrounding physicians also applies to other healthcare professionals.