IMLC teleradiology licensing: what the compact does

The Interstate Medical Licensure Compact (IMLC) is an expedited application pathway, and it issues no license of its own. An eligible physician designates one State of Principal License, receives a Letter of Qualification from that state, and can then request full licenses from other member states without repeating the whole verification. The Commission's own summary describes the compact as covering 44 states, the District of Columbia and the Territory of Guam, where physicians are licensed by 59 different medical and osteopathic boards. What arrives at the end of the process is an ordinary full state license, and the compact changes how fast it arrives and never whether it is required.

That distinction is the reason this page exists. Each state licensing page on this site answers the compact question for one state, whether it is a member, whether it can serve as a State of Principal License, and what local overlay survives the pathway. None of them has room for the mechanism itself, which is what a buyer is actually being sold when a vendor says "we use the compact." That mechanism sits here, once. If you run imaging at a hospital, an imaging center or a radiology group, the compact affects exactly one line of your coverage plan: how long it takes a teleradiology panel to add licensed reading capacity in your state. It touches nothing else on your critical path.

What does the Interstate Medical Licensure Compact do?

It routes one application to many state boards. The Commission is explicit that it does not issue a compact license or a nationally recognized medical license, and that licensing remains state-based throughout. The Commission's own description of the pathway sets out the sequence: designate a State of Principal License, apply, receive a Letter of Qualification confirming eligibility, then request licenses from the other member states where you intend to practice. The compact became operational in April 2017.

The State of Principal License is the load-bearing concept. It is the member state where the physician holds a full and unrestricted license and meets at least one of four connection tests: primary residence in that state, at least 25% of their practice of medicine occurring there, employment by a person, business or organization located there, or use of that state as their state of residence for US federal income tax purposes. That state performs the verification once and vouches for the physician to every other member state through the Letter of Qualification.

The saving compounds. A traditional application repeats primary source verification of medical school, graduate medical education, examination history, board certification and disciplinary record at every board, one state at a time. Under the compact that work happens once, and each additional state becomes a request against an existing Letter of Qualification. Compact files commonly resolve in weeks, against the 8 to 16 weeks or more a traditional board application can run. Those are industry-typical durations for physician licensure and none of them is an AstraRad figure.

Costs sit in the same shape. The Commission charges a non-refundable application fee, and each state adds its own licensing fee on top, published on the Commission's compact cost page. Those fees vary widely by board, and every figure on that page is a third-party, industry-typical physician licensure cost, none of them an AstraRad price. Applicants also submit fingerprints to the designated criminal justice agency in their State of Principal License for a background check.

Eligibility is stricter than a normal license application

The compact screens harder than the state applications it replaces, and that works in a buyer's favor. The Commission estimates that approximately 80% of US physicians meet the criteria, which means one physician in five does not. A radiologist who reaches your facility through a compact license has cleared a national eligibility filter before your medical staff office opens the file.

Requirement	What the Commission requires
Home license	Full, unrestricted license in a member state that qualifies as the State of Principal License
Connection to that state	Residence, 25% of practice, employer location, or federal income tax residency
Medical school	Accredited school, or one listed in the International Medical Education Directory or its equivalent
Graduate medical education	Completed in an ACGME or AOA accredited program
Examinations	Each component of the USMLE, COMLEX-USA or equivalent passed in no more than three attempts
Board certification	Current specialty certification, or time-unlimited certification, from an ABMS or AOABOS board
Record	No disciplinary action, no criminal history, no controlled substance action, no open investigation

Two of those rows matter more than the rest for radiology. The board certification requirement means an uncertified physician cannot use the compact at all, so the pathway is closed to precisely the readers a quality committee would question. And the three-attempt examination limit is absolute: it is a historical fact about a physician's record that no amount of later performance changes. A vendor whose growth plan depends on the compact is therefore recruiting from a pre-screened pool, which is worth knowing when you compare licensing timelines between vendors.

Eligibility is also a continuing state. A physician must maintain State of Principal License status at all times, and can move it to another member state through a process the Commission calls redesignation, after the initial Letter of Qualification has issued. Each physician makes their own self-determination of eligibility before applying.

What the compact does not do

Five things, and each one is a place where a coverage plan built on the compact quietly breaks.

It does not create a national license. Every member state still issues its own license, charges its own fees and applies its own conditions. A radiologist with compact licenses in twelve states holds twelve licenses, not one.

It does not waive a state's own requirements. Texas is the clearest example: compact applicants there still pass the Texas Jurisprudence Exam before the license issues. The full analysis of that state sits on our page covering teleradiology licensing in Texas. Any state-specific condition survives the compact untouched.

It does not reach non-member states. In California, a radiologist licensed anywhere else gains nothing from a Letter of Qualification. The Medical Board of California issues no telehealth-specific credential either, so a full California application is the only door. The same holds in the other states listed below.

It does not touch hospital privileging. Licensure is the state's decision about the physician; privileging is your governing body's decision about the same physician. The mechanism that compresses the second half is credentialing by proxy under the Medicare Conditions of Participation, and it is an entirely separate instrument with its own written agreement and its own ongoing obligations. A timeline that plans only the licensing half will slip on the privileging half.

It does not confer authority before the license issues. An application in progress is not a license. This is the single most common gap between what a vendor says and what a file shows, because "we are licensed in 45 states" and "we have applications pending in 45 states" sound similar in a sales conversation and look nothing alike in a credentials packet.

Which states are not members?

Six states sit outside the compact entirely, as of our August 2026 check against the Commission's participating states map: California, Massachusetts, New York, Oregon, South Carolina and Virginia. For a facility in any of those states, the compact is irrelevant to your vendor's lead time, and every radiologist who signs your reports filed a standard board application and waited out that queue.

The map itself carries four categories, and reading them correctly is most of the diligence:

Commission category	What it means for your coverage
Member state serving as SPL, processing applications and issuing licenses	Full participation in both directions. The expedited pathway is open.
Member state, non-SPL, issuing licenses	Compact licenses can be issued into the state, and the state cannot originate a Letter of Qualification.
Compact passed, implementation in process or delayed	Enacted in law and not operational. No radiologist can reach that state's license through the compact today.
Compact legislation introduced	A bill exists. Nothing more.

The third category is where buyers get hurt. Alaska, Arkansas, New Mexico and Rhode Island have all enacted the compact without turning it on, so a vendor quoting compact timelines for those states is quoting a pathway that has not opened. Our page on teleradiology licensing in Arkansas records the state board's own position on that onboarding work. The second category is narrow but real: Hawaii and Vermont issue compact licenses without serving as a State of Principal License, which our page on teleradiology licensing in Hawaii covers in detail.

One further note on verifying the count. The Commission's own pages do not agree with each other: its overview page describes 44 states, DC and Guam across 59 boards, while its information for physicians page still says 37 states and 50 boards. Treat any headline number, ours included, as a pointer to the map, and read the map itself before a count goes into a contract. Membership changes by legislation, and it changes in both directions of the calendar: New York has had bills introduced in both chambers without enactment, which is why the analysis on our page for teleradiology licensing in New York turns on a standard full application, and why teleradiology licensing in California reads the same way. The full picture across all 50 states sits in our state-by-state teleradiology licensing guide.

How a compact license changes your onboarding clock

For your facility, the compact shows up as one number: the interval between deciding you need reading capacity in a state and having a licensed subspecialist on that worklist. In a member state, that interval is weeks of licensing work. In a non-member state, it is a full board application per physician, and it is the reason honest vendors quote different lead times for different states instead of one national figure.

That interval is only one of three that run in an onboarding, and the other two are yours:

1. Licensure. The state medical board's decision about the physician. Compact or standard application, depending on the state.
2. Privileging. Your governing body's decision about the same physician, under your medical staff bylaws, with credentialing by proxy available to Medicare-participating hospitals and critical access hospitals.
3. Payer enrollment. Contractual, and untouched by either of the above. It surfaces as a billing problem a month after go-live if nobody sequenced it.

AstraRad opens the first two on the same day and names the third at the quote stage so it does not surface late, which is what lets the published onboarding commitment hold: a first signed report within 10 business days of countersignature, on a fixed plan with named owners on both sides, with the sequence and the integration work set out in our integration and onboarding page. Every radiologist on our reading panel of board-certified subspecialists is licensed in the state where your patients are located, whichever route that license came through, and every read is performed inside the United States. The onboarding commitment is defined in our published SLA.

The compact is not a shortcut we ask you to accept in place of a credential. It is a faster way for our panel to hold the credential your state already demands, and the report that comes back to your PACS is final and signed either way.

How should a buyer check a vendor's compact claim?

Three questions, and they take about ten minutes on a call.

"Which of my states are compact members, and which are not?" A vendor that reads nationally knows this without looking, because it governs their own hiring plan. A vendor that answers with a single national number for licensing lead time has either not done the analysis or is describing an average that will not apply to you.

"Show me the license, not the application." Ask for issuing state, license number and issue date for every radiologist who may sign your reports, and confirm each is active. The compact makes licenses arrive faster and does not make a pending application into authority.

"Which credential covers the physician who signed this specific report?" This is the question that survives contact with an audit, a payer review or a deposition, because a document answers it and a marketing claim does not. It is worth asking against a report you already hold.

A vendor answering all three cleanly has a licensing operation. One that reaches for the compact as a general reassurance is describing a pathway, and a pathway is not a credential. If you want those answers for your own states before you compare anyone, book a coverage consultation and the licensing detail comes back with the roster.

Last verified August 2026, against the Interstate Medical Licensure Compact Commission's published pathway, cost and participating states pages, and the state medical boards named above. This is not legal advice. Confirm requirements with your counsel and the relevant state medical board.