80,000 Doctors and Nurses Caught in America’s Broadest Immigration Ban

In a rural clinic where the nearest hospital is an hour’s drive and the waiting list for a primary care appointment runs into months, the odds are unusually high that the doctor who eventually sees you trained somewhere on a list of 19 countries the United States has now closed its doors to. That is the uncomfortable pattern buried in a new analysis from Harvard researchers. The clinicians most exposed to the country’s broadest immigration ban in years are not, it turns out, scattered evenly across the map. They cluster, disproportionately, in exactly the places that can least afford to lose them.

The ban itself landed on 2 December 2025. Nineteen countries, every immigration pathway, every visa status, and no expiration date attached.

What makes this one different from the travel restrictions and visa-fee hikes of years past is its reach. Earlier policies tended to throttle temporary entry or simply make employment-based visas more expensive to obtain. This one shuts the whole pipeline. And because medicine has long leaned on internationally trained staff to plug its gaps, a policy framed around borders ends up, almost as a side effect, being a policy about who staffs the night shift in an understaffed ward.

Tarun Ramesh, Michael Liu and Hao Yu, working out of Harvard, set out to measure the size of that side effect. Their tool was migration data from the OECD stretching back to 2010, cross-referenced against US census figures and a county-by-county vulnerability index.

The headline numbers are not small. By 2023, roughly 23,700 physicians and more than 56,000 nurses already working in the US had trained in one of the banned countries, the team found, which works out to about 2.15 percent of all American doctors and 1.41% of its nurses. Iran, Venezuela and Cuba sent the most physicians over the study window; for nurses it was Cuba, Haiti and Iran. And the flow had been rising, not falling: annual physician arrivals from these countries climbed from 350 in 2010 to 459 by 2023.

Two percent. You might reasonably shrug at that. A rounding error in a workforce of more than a million doctors, surely.

Where the Two Percent Actually Lands

Except averages lie, and this is where the study earns its keep. The researchers did not stop at the national tally. They went looking for where these clinicians actually work, and the geography turns out to be everything. Counties that had at least one physician from a banned country were roughly two and a half times more likely to be designated a primary care shortage area, a federal label reserved for places already starved of doctors. They also tended to have larger Hispanic and Black populations, fewer high school graduates, and they sat, more often than not, outside the comfortable corridors of the Northeast. The nurse picture was, if anything, starker. In the counties that relied on them at all, nurses from banned countries made up a remarkable 14 percent of the entire nursing workforce.

So the burden is not spread thin. It is concentrated, like a stress fracture, on the parts of the system that were already cracking.

What the Numbers Can and Cannot Say

There are caveats, and the authors are careful to lay them out. The OECD data cannot tell you a given doctor’s immigration status, so it is impossible to say precisely how many of those 23,700 physicians would actually have been blocked had the ban existed when they arrived. Nor can a snapshot like this prove that the ban will cause harm; it can only show what stands to be lost. Specialty is invisible in the numbers too, and not every health worker who emigrates ends up treating patients at all.

Still, the direction of travel is hard to argue with. If the tap that supplied these clinicians is now shut off, and the researchers note there is little reason to expect arrivals from unbanned countries to suddenly surge and make up the difference, then the shortfall has to land somewhere. It tends to land on the patients with the fewest alternatives.

Which is the quietly alarming thing here. A shortage-area county does not feel an immigration policy on the day it is signed; it feels it slowly, in the appointment that gets pushed back, the maternity ward that consolidates two towns over, the retiring physician nobody arrives to replace. The damage, if it comes, will be diffuse and deferred and very difficult to pin on any single decision. The numbers in this paper are really an attempt to make a slow problem visible before it arrives.

Whether anyone acts on that early warning is, of course, a different question entirely. For now the data simply sits there, counting the people a policy was not really designed to count.

DOI / Source: JAMA Network Open (doi:10.1001/jamanetworkopen.2026.18999)

Frequently Asked Questions

Why would an immigration ban hit some communities harder than others?

Because foreign-trained doctors and nurses do not work everywhere equally. The analysis found they cluster in counties already designated as primary care shortage areas, often with larger minority populations and fewer resources. So a nationwide policy effectively concentrates its impact on the places with the thinnest medical coverage to begin with.

Is it true that only about two percent of US doctors come from the banned countries?

Yes, roughly 2.15 percent of all American physicians in 2023 trained in one of the 19 countries, alongside about 1.4 percent of nurses. But that national average is misleading, because in the specific counties that depend on them, nurses from those countries can make up around 14 percent of the local workforce. A small national share can still be a critical local lifeline.

What makes this ban different from earlier travel restrictions?

Previous measures mostly limited temporary entry or raised the cost of work visas, leaving some pathways open. This ban covers every immigration route and visa status across all 19 countries, with no expiration date set. That comprehensiveness is exactly why researchers think its effect on the health workforce could be larger and more lasting.

Could doctors from other countries simply fill the gap?

The researchers think that is unlikely. Given the current direction of immigration policy, they argue there is little reason to expect a compensating surge of clinicians from countries not on the list. If that holds, the lost physicians and nurses would represent a genuine reduction in capacity rather than a reshuffling.