A retired emergency physician is sitting at his kitchen table in March 2020, filling out an online form to volunteer at a field hospital being stood up twenty minutes from his house.
He has been licensed for thirty-one years. He ran a busy ED for most of that career. He retired eighteen months ago, healthy, sharp, and, at this exact moment, watching the news describe a wave of patients his former hospital cannot handle alone. He wants to help, and he has the exact credential the situation requires.
He registered with his state's volunteer health professional system years ago, back when a colleague mentioned it at a conference and it seemed like the responsible thing to do. He assumed that registration meant something, that somewhere a system had his license on file, ready to confirm he was who he said he was the moment anyone needed to check. What he discovers instead, over the following days, is that nobody can verify his license status, his specialty currency, or even confirm he is still alive in the system's records fast enough to get him into the field hospital before the surge that needs him has already crested.
He is not an edge case. Across the country, retired physicians, off-duty nurses, and licensed clinicians outside their home state are hitting the identical wall: a federal volunteer registry that exists specifically for this moment, that has existed on paper for nearly two decades, and that cannot verify a credential fast enough to matter when the emergency actually arrives.
States respond the only way they can on short notice: emergency licensure waivers, passed state by state, improvised in the middle of a crisis, substituting for the system that was supposed to make this unnecessary.
A registry built to answer one question, fast, in an emergency, was never built to keep that answer current, and the gap between registration and verification is exactly where the surge capacity the country needed disappeared.
The system was shrinking in the years it was needed most
This is the detail that turns a design flaw into something closer to institutional neglect.
Medical Reserve Corps unit count fell from 957 in 2017 to 839 by January 2020, the very door of the pandemic, with 175,283 registered volunteers spread across all fifty states plus the District of Columbia, Guam, Palau, Puerto Rico and the U.S. Virgin Islands. And MRC's federal budget was cut from a roughly $6 million baseline to $3.9 million in both fiscal year 2020 and fiscal year 2021, the exact years the country most needed a functioning volunteer surge system.
Put plainly: the infrastructure built specifically to deliver credentialed clinical volunteers fast, in an emergency, was contracting in scale and in funding at the precise moment the emergency it existed for arrived. This was not a system caught off guard by an unforeseeable event. It was a system already being deprioritized when the event it was designed for hit.
ESAR-VHP, the Emergency System for Advance Registration of Volunteer Health Professionals, was created by Congress in 2002, specifically in response to the recognized need for verified clinical surge capacity after prior disasters. Nearly two decades later, when the system finally faced its defining test, it did not deliver at the speed or scale the moment required.
Why registration is not the same as verification
The core design flaw, once named, is simple, and it explains almost everything that went wrong.
Volunteers register once, and credentials go stale. A license that was active and unrestricted at the moment of registration may have lapsed, been restricted, or simply changed specialty focus by the time an activation actually happens, sometimes years later. The registry, as built, has no continuous mechanism to keep that information current. It captures a snapshot, not a living record.
At activation time, this means the registry does not reliably reflect current license status, specialty currency, or even whether a registered volunteer is still willing and able to deploy. Verification at the moment of need runs through the National Practitioner Data Bank and individual state licensing boards, often manually, precisely the kind of process that takes days when a crisis is measured in hours.
That is the structural reason states had to pass emergency reciprocity legislation on the fly in 2020: not because volunteers did not exist, but because the pre-existing registry could not confirm, fast enough, that the volunteers who did exist were who they said they were and were currently qualified to practice. States built ad hoc waivers because the standing system that was supposed to make ad hoc waivers unnecessary had already failed the speed test.
What nobody owns, and why
ASPR and HHS funding for the Medical Reserve Corps has been cut, not grown, in the years since COVID, despite the demonstrated, well-documented need exposed by the pandemic response itself. This is not a hypothetical funding gap; it is a continuation of the same trajectory, 957 units down to 839 before the pandemic even began, that produced the failure in the first place.
State licensing boards operate independently, with no unified national verification system. Each board maintains its own records, at its own pace, with its own systems, and no standing infrastructure connects them into a single, queryable source that a national emergency-response system could check in real time.
Private-sector credentialing companies, including locum tenens staffing firms, verify credentials at commercial speed, for commercial purposes. They are genuinely good at fast verification, because their business depends on it. But they exist to staff paid positions for paying clients, not to serve as free, neutral public-emergency infrastructure, and there is no reason to expect a commercial credentialing operation to redirect its capacity toward an uncompensated public emergency without a specific contract to do so.
The result is a gap that persists for the same reason many of the gaps in this series persist: the institution that could plausibly own continuous verification, ASPR, has instead cut the budget for the program that would need it, while the institutions capable of fast verification at scale, commercial credentialing firms, have no public mandate or funding to apply that capability to disaster response.
A private-sector proof of concept, at meaningful scale
There is a useful comparison worth naming directly, because it demonstrates that the scale problem, at least, is solvable outside the federal system entirely.
Team Rubicon, a private disaster-response organization built independently of the federal registry system, reports more than 180,000 members. That is a larger volunteer base than the Medical Reserve Corps' 175,283 registered volunteers as of January 2020, built and maintained by a private nonprofit rather than a federal agency.
This does not prove that Team Rubicon has solved the specific credential-verification problem this article describes, since its model and its volunteer mix differ from ESAR-VHP's clinician-specific focus. What it does prove is that a non-federal, non-governmental organization can build and sustain volunteer scale that rivals or exceeds the federal system's own numbers, which weakens any argument that only a government agency, with all its funding constraints, is capable of maintaining a registry at the scale a real emergency requires.
The structural failure: register-once cannot serve verify-fast
ESAR-VHP and MRC were built on a register-once, verify-later model, and a disaster requires verify-fast. Those are two fundamentally different operating requirements, and the system was designed around the first one, then asked, when the moment came, to perform the second.
A continuously current registry requires ongoing maintenance: periodic re-verification of license status, specialty currency checks, confirmation that a volunteer is still willing and reachable. That maintenance work is expensive and unglamorous, exactly the kind of recurring operational cost that gets cut first when a program's budget shrinks from $6 million to $3.9 million, because its absence is invisible until the exact moment it matters most.
A membership organization that verifies licensure continuously for reasons unrelated to disaster response can carry surge readiness at close to zero marginal cost. This is the structural insight worth sitting with: if an organization is already doing ongoing license verification as a routine part of its normal function, serving its members every day, not just during emergencies, then flagging which of those already-verified members are willing to deploy in a crisis is a small additional feature, not a separate multi-million-dollar federal program that has to be rebuilt and refunded from scratch after every budget cycle.
That is precisely the piece the federal system lacks. ESAR-VHP and MRC exist only for the emergency; there is no everyday function generating the continuous verification work as a byproduct. The verification burden sits entirely on the disaster-response budget line, which is also the line political appetite for funding shrinks fastest once the immediate crisis recedes from memory.
What would actually work
Continuous re-verification as a standing feature, not an emergency-activation task. License status, specialty currency and deployment willingness need to be checked on a recurring cycle well before any disaster, not reconstructed under pressure once one begins.
A queryable, cross-state registry, not fifty separate state systems. A national emergency does not respect state boundaries, and a verification system that requires checking fifty separate licensing boards individually cannot deliver an answer at the speed a real activation requires.
Deployment-readiness as an opt-in status layered onto an existing, non-emergency verification relationship. The most efficient way to build this is not a dedicated disaster-only registry but a "surge ready" flag on a membership base that is already being verified continuously for other reasons, exactly the model this series has argued applies across many of medicine's expertise-routing failures.
Interoperability with existing licensure compacts, not replacement of them. The Interstate Medical Licensure Compact and the Nurse Licensure Compact already reduce cross-state licensing friction for participating clinicians; any new verification layer needs to work alongside these, confirming and accelerating what they already establish rather than duplicating it.
Explicit deference to state emergency-declaration authority. A faster verification registry is not a substitute for the legal authority that activates emergency deployment; it needs to be built as a tool that state and federal emergency management can query and rely on, not a parallel authority that competes with official channels.
Liability protections clarified in advance, not negotiated mid-crisis. The federal PREP Act provides some liability protection for volunteer clinicians during declared emergencies; any registry needs to make clear to volunteers, in advance, exactly what protection applies, since uncertainty about liability is itself a deterrent to volunteering when speed matters most.
A measurable readiness benchmark, tested before a real disaster, not discovered during one. An annual or biennial simulated activation, testing how many registered volunteers can actually be reached and credential-confirmed within 24 hours, would surface exactly the kind of gap this article describes before it costs lives, rather than after.
What you can do now
If you are a retired or licensed clinician interested in disaster volunteering
Register with ESAR-VHP or your state's volunteer health system, and then actually confirm your information is current, not just that you submitted a form years ago. Registration alone, the evidence here shows plainly, does not guarantee you will be verifiable fast enough when it matters.
Ask your state's system directly how re-verification works, and how often. If the honest answer is "it doesn't, beyond initial registration," that is useful information about how reliable the system will actually be in a real activation, and it is worth knowing before you need it rather than during a crisis.
Consider a private disaster-response organization as a complement, not a replacement. Organizations like Team Rubicon have demonstrated real scale outside the federal system; participating in more than one channel increases the odds you are reachable and verifiable when an actual emergency arrives.
If you lead a hospital emergency-management or public health preparedness function
Do not assume ESAR-VHP or your state's MRC unit can deliver verified volunteers at the speed your emergency plan assumes. Test it. A simulated activation, checking how many registered volunteers in your region can actually be reached and credential-confirmed within 24 hours, will tell you more about your real surge capacity than the registry's raw headcount ever will.
Build relationships with private disaster-response organizations and locum credentialing firms as a supplement, in advance of need. Commercial credentialing capability exists and is fast; the barrier is contractual and relational, not technical, and both are far easier to establish before a crisis than during one.
If you fund or govern public health emergency preparedness
Recognize that MRC's budget trajectory, from a roughly $6 million baseline down to $3.9 million during the exact years it was needed most, is itself a policy choice with a documented cost. Restoring and stabilizing that funding is a direct, addressable lever, not a hypothetical one.
Consider that continuous verification is the actual missing capability, not volunteer recruitment. The evidence here does not describe a shortage of willing clinicians; 175,283 registered MRC volunteers and Team Rubicon's 180,000-plus members both suggest ample willingness exists. What is missing is the ongoing work of keeping that willing population's credentials current and instantly verifiable.
Frequently asked questions
What is ESAR-VHP and how does it work? ESAR-VHP, the Emergency System for Advance Registration of Volunteer Health Professionals, was created by Congress in 2002 to pre-register and pre-verify licensed clinical volunteers so they can be deployed quickly during a declared public health emergency. In practice, registered volunteers' credentials are not continuously re-verified after initial registration, which slowed activation during COVID-19.
Why did the Medical Reserve Corps struggle during COVID-19? Unit count had already fallen from 957 in 2017 to 839 by January 2020, and its federal budget was cut to $3.9 million in both fiscal year 2020 and fiscal year 2021, the exact years of peak pandemic demand, meaning the program's capacity was contracting precisely when it was needed most.
How are volunteer physicians credentialed during a disaster? Verification typically runs through the National Practitioner Data Bank and individual state licensing boards, often manually, a process that can take days rather than the hours a real emergency activation requires; many states responded to this gap during 2020 by passing emergency licensure reciprocity legislation.
What happened to public health emergency workforce funding after COVID? Medical Reserve Corps funding has not been substantially restored or grown since the pandemic; ASPR and HHS funding for the program has continued on a constrained trajectory despite the documented gap COVID-19 exposed, based on the most recent publicly available figures.
How many volunteers are registered with the Medical Reserve Corps? As of January 2020, the Medical Reserve Corps reported 175,283 registered volunteers across 839 units in all 50 states plus the District of Columbia, Guam, Palau, Puerto Rico and the U.S. Virgin Islands. For comparison, the private disaster-response organization Team Rubicon reports more than 180,000 members, built independently of the federal registry.
Can a private organization replace ESAR-VHP or the Medical Reserve Corps? Not entirely, since official emergency deployment still requires state and federal emergency-declaration authority and liability protections such as those under the PREP Act. But Team Rubicon's scale demonstrates that a non-federal organization can build and sustain a volunteer base comparable in size to the federal system, suggesting continuously verified private infrastructure could meaningfully complement, and accelerate, official channels.
The bottom line
A retired emergency physician with thirty-one years of licensure, sitting at his kitchen table wanting to help, should be one of the easiest people in the country to verify and deploy in a crisis. The evidence from COVID-19 says otherwise: the federal registry built specifically for this moment could not confirm his credentials fast enough to matter, because it was designed to register volunteers once and never built to keep their status current.
That failure was not a surprise sprung by an unforeseeable pandemic. Medical Reserve Corps units had already fallen from 957 to 839, and its budget had already been cut to $3.9 million, in the years immediately before COVID-19 arrived. The system was shrinking exactly when it was about to be tested.
States improvised emergency licensure waivers because the standing infrastructure could not deliver at the speed a disaster requires. That improvisation worked, imperfectly and under enormous strain, precisely because the system built for this purpose two decades earlier did not.
The volunteers exist. Team Rubicon's 180,000-plus members and MRC's own 175,283 registered volunteers both make that clear. What is missing is not willingness. It is the unglamorous, continuous work of keeping a large population's credentials current enough to be trusted instantly, the exact capability a register-once system was never built to provide.
A registry built to answer one question, fast, in an emergency, was never built to keep that answer current, and the gap between registration and verification is exactly where the surge capacity the country needed disappeared.
Part of a series on the missing professional infrastructure of healthcare. Previously: The Next Chapter
Evidence note: sources include Wikipedia's Medical Reserve Corps entry, itself sourced from HHS data, for MRC unit counts (957 in 2017, 839 in January 2020), volunteer counts (175,283) and federal budget figures ($6 million baseline cut to $3.9 million in FY2020 and FY2021); ASPR.gov for ESAR-VHP's 2002 congressional origin; and Team Rubicon's own published membership figures (180,000-plus), which are organization-reported and not independently audited. This article does not have access to a GAO audit or state-level after-action report specifically quantifying credential-verification delays during 2020-2021 activations; the causal link drawn here, between register-once system design and 2020's emergency licensure waivers, is a reasonable inference from the documented funding and unit-count trends rather than a finding from a dedicated federal audit, and should be read with that distinction in mind.
