The Interstate Medical Licensure Compact (IMLC): A Physician's Guide to Faster Multi-State Licensure

If you've ever applied for a medical license in a new state and watched the calendar drag past 90 days while you waited for verifications, transcripts, and committee meetings to align, you've felt the cost of how slow traditional state-by-state licensure can be.

The Interstate Medical Licensure Compact — usually called the IMLC, or just "the Compact" — is the closest thing American physicians have to a fast lane. It is not a federal license. It is not a single license that works in every state. It is a streamlined process that lets eligible physicians get licensed in additional participating states in weeks instead of months, by reusing a single rigorous credentials review across every Compact state at once.

For locum tenens, telehealth, and multi-state practice physicians, the IMLC is one of the highest-leverage tools available. For everyone else, it's still worth understanding, because the criteria for eligibility are stricter than most physicians realize — and being prepared to use it the moment you need to is a different problem than being prepared to apply for one license.

Here's what the IMLC actually is, how the process works, who it's built for, and where the bottlenecks show up.

The Short Version

The IMLC is an agreement among 43 U.S. states (plus the District of Columbia and Guam) that lets a physician licensed in good standing in one participating state apply for full medical licenses in any of the other participating states through a single, streamlined application process.

You apply once through the Compact, your credentials are verified once, and you're issued a Letter of Qualification (LOQ) that is valid for 365 days. During that year, you can request a license in any participating state by paying that state's licensing fee — and the state typically issues the license in a handful of business days rather than months.

You still get a separate full medical license from each state. The IMLC is not a national license. What it removes is most of the duplicate paperwork, primary source verification, and waiting time that traditional state-by-state applications require.

What the IMLC Actually Is (And Isn't)

A few things worth being precise about:

It is an interstate agreement, not a federal program. The Compact is administered by the IMLC Commission, which is made up of representatives from each participating state medical board. Each member state still issues its own license under its own statutes.
It is for physicians (MDs and DOs). It does not cover advanced practice clinicians. Nurse practitioners have a separate compact (the APRN Compact, much narrower in adoption). Physician assistants have their own separate program — the PA Licensure Compact — which has been picking up state adoption rapidly but operates under different rules and a different state list than the IMLC.
It produces full state medical licenses. A license you receive through the Compact is identical to a license obtained by applying directly to that state — full scope, full practice authority, full renewal cycle. The IMLC is a faster path to the same license.
Eligibility is intentionally narrow. Not every physician qualifies. The Compact is built for physicians with clean records, current board certification (or recent certification eligibility through a graduate medical education program), and an unrestricted full license in a participating "home" state.
It does not replace primary source verification at the hospital, payer, or credentialing level. Hospitals and payers will still do their own credentialing on you when you join their staff or network. The IMLC accelerates the licensure step, not the downstream credentialing steps.

The shorthand: the IMLC is the fastest legitimate way to get additional state medical licenses for a physician who qualifies. It is not a shortcut around credentialing.

Who Qualifies for the IMLC

To use the Compact, you must meet every one of the following at the time you apply:

Hold a full, unrestricted medical license in a participating state that qualifies as your State of Principal Licensure (SPL).
Have graduated from a medical school accredited by the LCME (MDs) or the AOA Commission on Osteopathic College Accreditation (DOs), or — for international medical graduates — hold ECFMG certification.
Have completed an ACGME- or AOA-accredited graduate medical education program (residency).
Hold current specialty board certification by an ABMS or AOABOS member board (or hold a time-unlimited certification from one of those boards), or have passed the final step of your licensing exam (USMLE Step 3 or COMLEX-USA Level 3) within the past three years.
Have passed each component of the USMLE, COMLEX-USA, or equivalent in no more than three attempts per component.
Have no history of disciplinary actions against your license, no controlled substance restrictions, no past felony convictions, no current investigations, and no active disqualifying events.

The "no disciplinary history" bar is strict. Even an old, resolved board action that didn't restrict your practice can disqualify you. If you have anything in your record, talk to the IMLC Commission before assuming you don't qualify — and before paying the application fee.

What counts as your State of Principal Licensure

Your SPL must be a participating Compact state, and you must meet at least one of these criteria there:

It's the state where your primary residence is located, or
It's the state where at least 25% of your practice of medicine occurs, or
It's the state where your employer is located, or
It's the state you use as your state of residence for federal income tax purposes.

You designate one SPL when you apply. If your situation changes (you move, you change employers, your practice mix shifts), you can update your SPL — but you can only have one at a time, and your eligibility runs through that one state.

How the IMLC Process Actually Works

The end-to-end flow has three distinct phases. Understanding which phase you're in keeps expectations realistic.

Phase 1 — Apply for a Letter of Qualification (LOQ)

You submit a single application through the IMLC Commission's online portal that designates your State of Principal Licensure and authorizes the SPL to perform a one-time, comprehensive credentialing review. The SPL then verifies:

Your medical school and graduate medical education
Your specialty board certification and/or licensure exam history
Your current license status in the SPL
Your background check (fingerprint-based federal and state)
Any history of malpractice, complaints, or disciplinary action
Your identity and biographical information

This is the rigorous step. It typically takes a few weeks once your fingerprints are submitted and your supporting documents are in.

Once the SPL is satisfied, the IMLC Commission issues you a Letter of Qualification (LOQ). The LOQ is the artifact that unlocks everything that follows.

Phase 2 — Request Licenses in Compact States

The LOQ is valid for 365 days from the date of issuance.

During that year, you can request a full medical license in any other participating Compact state by:

Logging into the IMLC portal
Selecting the state(s) you want
Paying that state's licensing fee directly to the state through the portal

The state then issues you a full license — usually within a few business days, sometimes a couple of weeks depending on the state board's processing schedule. There is no second round of primary source verification. There is no second background check. There is no committee meeting to wait for.

You can request licenses in multiple states off the same LOQ. Each state issues its own full license, with its own license number and its own renewal cycle.

Phase 3 — Renewals

Each license obtained through the Compact renews under that state's normal renewal cycle, fees, and CME requirements. The Compact gets you the license. It doesn't change how renewals work after that.

You do not have to re-do the IMLC application every year. You only repeat the LOQ process if you want to request additional new state licenses after your current LOQ has expired.

How Long IMLC Licensure Actually Takes

Two timelines that are easy to confuse:

Time to get your first LOQ: typically several weeks. The bottleneck is usually one of (a) waiting for your fingerprint background check to clear, (b) getting your medical school or residency program to send verification documents, or (c) waiting for your SPL board to complete its review. Plan on a month or so end-to-end if you're well-prepared, and longer if any of your underlying records are stale or hard to retrieve.

Time to get an additional state license once you have an LOQ: typically 7–14 days, often less. Several states issue Compact-route licenses within a few business days of the fee being paid.

For comparison, the traditional state-by-state route from a fresh application to license in hand commonly runs 60 to 120 days per state, sometimes longer when documents go missing or committee meetings space out reviews. The Compact's value is most visible when you stack states: getting your second, third, fourth, or fifth license through the Compact off a single LOQ is dramatically faster than going through each state individually.

What the IMLC Costs

There are two cost components.

The IMLC application fee — paid once when you apply for your LOQ. This currently runs around $700, paid to the IMLC Commission. Confirm the current fee on the Commission's site before applying; it has changed before.

Each state's licensing fee — paid separately to each state when you request a license through the Compact. State fees vary widely — from under $100 in the cheapest states to nearly $900 in the most expensive (Texas tops the list at $895; states like Pennsylvania, Wisconsin, and Missouri sit at the low end). The state fees are the same fees you would pay if you applied directly — the Compact does not add a surcharge. You're paying for the state license; the IMLC fee is what buys you the streamlined verification.

Renewals are billed by each state under its normal renewal schedule, separately from the IMLC.

Which States Participate

43 states currently participate in the Compact, along with the District of Columbia and Guam. Several additional states (including Arkansas, New Mexico, and Rhode Island) have passed legislation to join but are still in implementation, and the map keeps moving — Alaska passed legislation in mid-2026 to become the 44th member, with Massachusetts not far behind.

A few notable states are not in the Compact at this time — California and New York being the largest. Florida joined in 2024 and is now a participating state, which is a meaningful shift for locum tenens and telehealth physicians who do significant work there. If you need a license in a non-Compact state, the IMLC will not help you with that specific state, and you'll go through the traditional process there.

One structural quirk worth knowing:

Hawaii and Vermont participate but cannot serve as a State of Principal Licensure. You can receive a license in those states through the Compact, but you can't enter the Compact through them — they're fine as a destination, not as the starting point.

For the current list of participating states (and pending member states), check the IMLC Commission directly at imlcc.com. The map changes year over year.

The IMLC for Locum Tenens Physicians

The Compact is the single most useful licensure tool available to locum tenens physicians who qualify, and it changes the economics of taking multi-state assignments.

The math is concrete. A locum physician who wants to be license-ready in five Compact states, going state-by-state, is looking at roughly 90 days per state — and because those applications stack and stall in different ways, the full set realistically lands six to twelve months out. The same physician going through the Compact is looking at about four weeks for the LOQ, then one to two weeks per state, with applications running in parallel rather than in series. Five states becomes a six-to-eight-week project instead of a multi-quarter one — at effectively the same total cost, since the state fees are identical and the IMLC application fee replaces nothing but waiting.

A few patterns worth knowing:

Time the LOQ to your assignment pipeline. Because the LOQ is valid for 365 days, the best time to get one is right before you expect a cluster of multi-state opportunities, not after. Locum physicians who get the LOQ first and then take assignments are routinely available 60+ days sooner than peers who wait until an offer comes in.
Stack states proactively. If you know you'll likely work in three Compact states this year, request all three licenses while the LOQ is fresh — even if only one assignment is currently in hand. The marginal cost is one state fee; the option value is enormous.
Plan for non-Compact states separately. California and New York are the largest non-Compact states. Those licenses are still 90- to 120-day projects on the traditional track. Don't confuse "Compact-ready" with "ready everywhere."
Keep your SPL clean. If your home-state license lapses, gets restricted, or hits any disciplinary issue, your LOQ becomes invalid and so does your ability to use the Compact going forward. Maintaining the SPL in good standing is the foundation everything else stands on.

Common IMLC Mistakes That Cost Physicians Weeks

A few patterns come up repeatedly.

Applying without confirming eligibility. The Compact's eligibility bar is narrower than the bar for an ordinary state license. Physicians sometimes apply, pay the fee, and then learn weeks later that a long-resolved board issue or a non-accredited program disqualifies them. Read the eligibility criteria carefully and contact the Commission if there's any doubt.

Letting the LOQ expire unused. The 365-day clock starts the day the LOQ is issued, not the day you actually need a new state license. Physicians who request the LOQ "just to have it" and then don't act on it can end up paying the application fee twice.

Out-of-date credential file. The SPL's verification process pulls documents from your medical school, GME program, current employer, and prior licensure. If those records are stale, hard to retrieve, or mismatched in any way, the LOQ phase stalls. The single biggest predictor of how long Phase 1 takes is how organized the underlying credential file already is.

Wrong State of Principal Licensure. Designating an SPL you don't actually meet the criteria for, or designating a state with a slow board when you have a faster option, is a recoverable mistake but a costly one. Make this choice deliberately.

Assuming the IMLC covers credentialing. Hospitals and payers will still credential you under their own processes after you have the license. The IMLC accelerates licensure. It does not accelerate the downstream credentialing decisions that depend on the license.

IMLC vs. Other Routes to Multi-State Practice

A few comparisons that come up:

IMLC vs. traditional state-by-state licensure — Compact is dramatically faster for physicians who qualify and want licenses in participating states. Traditional licensure is the only route in non-Compact states.
IMLC vs. FCVS (Federation Credentials Verification Service) — FCVS is a credential verification service from the FSMB that physicians can use to assemble a verified credentials portfolio many state boards will accept. It is useful, especially for non-Compact states, but it does not produce the same speed advantage the IMLC does, and it is not a license in itself.
IMLC vs. telemedicine-specific licenses — A handful of states offer special, limited telemedicine licenses. These are narrower in scope than a full Compact license and are typically only useful if you're doing telehealth exclusively into that state.
IMLC vs. the APRN Compact and the PA Licensure Compact — Different programs, different scopes, different state lists. The APRN Compact (for nurse practitioners) and the PA Licensure Compact (for physician assistants) each have their own member states, eligibility rules, and timelines. None of these is the IMLC, and being in one says nothing about being in the others.

The IMLC is the most powerful of these for physicians who qualify, but it's not the only tool in the box.

How VestaCreds Helps

VestaCreds is built for the clinician side of credentialing — the credential data and documents you control, organized in one place, ready to push out wherever they need to go. For physicians using or preparing to use the IMLC, that matters in a specific way: the LOQ phase is largely a credential file exercise. The faster the SPL can confirm your medical school, GME training, board certification, malpractice history, prior licensure, and supporting documents, the faster the LOQ gets issued — and the same underlying file feeds every state license request, every renewal, and every locum or payer enrollment that comes after.

What VestaCreds gives you is a single place where that file actually lives: a structured CV with the sections licensure applications expect (education, training, work history, hospital affiliations, gaps already explained); a credential vault for diplomas, residency completion certificates, board certificates, every active and prior state license, DEA, and malpractice face sheets, with versioned uploads so the current document is the one ready to send.

On top of that, expiration tracking on every license, DEA, board certification, and malpractice policy, with alerts at 90, 60, and 30 days so the SPL license you're depending on doesn't lapse mid-LOQ; and a one-click credentialing packet that bundles credentials, documents, and CV into a single PDF for any state board, hospital, or agency that wants its own copy. VestaCreds does not submit IMLC applications for you. What it does is make sure the file underneath the application is current and organized — so the LOQ phase goes from "spend a week chasing down records I haven't touched in years" to "spend an afternoon submitting an organized file."

FAQs: The IMLC

Q: Is the IMLC a federal license? No. It is an interstate compact administered by participating state medical boards. Each state still issues its own full license under its own statutes; the Compact streamlines how those state licenses are reviewed and issued.

Q: How many states are in the IMLC? 43 states, plus the District of Columbia and Guam. California and New York are the largest U.S. states not currently in the Compact. The current map lives at imlcc.com and changes year over year.

Q: How long does it take to get an IMLC license? The first Letter of Qualification typically takes a few weeks, depending on background check turnaround and how quickly your medical school, residency, and prior licensure board respond. After the LOQ is issued, additional state licenses typically follow within 7–14 days of paying the state's fee.

Q: Does the IMLC cover physician assistants or nurse practitioners? No. The IMLC is for MDs and DOs only. Nurse practitioners have a separate APRN Compact with much narrower state participation. Physician assistants have the PA Licensure Compact, which is a separate program with its own state list and rules.

Q: Can I use the IMLC if I had a past disciplinary action on my license? Probably not, depending on the action. The Compact's eligibility criteria are strict on past discipline, even for resolved actions that did not restrict your practice. Contact the Commission before applying if you have anything in your record.

Q: What happens when my LOQ expires? You can re-apply for a new LOQ at any time. The new application requires updated background checks and verification. The state licenses you already received through the previous LOQ remain valid — those are full state licenses that exist independently of the LOQ that produced them.

Q: Does the IMLC accelerate hospital credentialing or payer enrollment? No. It accelerates licensure. Hospitals, agencies, and payers will still credential you under their own processes once you have the license. Those downstream processes depend on having an organized, complete credential file, regardless of whether the underlying license came through the Compact or a traditional route.

Q: Can I designate a different state as my SPL if my situation changes? Yes. You can change your State of Principal Licensure if you meet the criteria for a different participating state (primary residence, primary practice location, employer location, or state of tax residence). You can only have one SPL at a time.

The Bottom Line

The IMLC is the closest American medicine has to a fast lane for multi-state licensure, and for the physicians who qualify it changes what is realistic in terms of practice flexibility. Locum tenens physicians, telehealth physicians, and multi-state employed physicians who pass the eligibility bar can get licensed in additional participating states in weeks rather than months — at the same cost, with the same full scope of practice, off a single rigorous credentialing review they only have to go through once a year.

The physicians who get the most out of the Compact are the ones who treat it as a planning tool — get the LOQ before the assignment, stack states proactively, keep the SPL license clean — and who keep the underlying credential file organized so the LOQ phase doesn't stall on missing documents.

The IMLC removes the time tax of duplicate verifications. It does not remove the requirement that your credentials be in order. That part still lives with you.

If the LOQ phase takes longer than expected, it's almost always the credential file — not the Compact itself.

Get your credential file ready at VestaCreds — so when the next opportunity comes, the Compact runs at the speed it was designed to.

VestaCreds is a medical credentialing platform that helps physicians and advanced practice clinicians organize, maintain, and export their credentials — so the process moves faster when it matters.