Interstate Medical Licensure Compact (IMLC) Overview
The Interstate Medical Licensure Compact is a voluntary agreement among participating U.S. states and territories that lets eligible physicians obtain medical licenses in multiple jurisdictions through a single, streamlined application process. For telehealth, where a physician in Ohio might routinely treat patients in six other states, the IMLC has become a foundational piece of the telehealth state laws and licensure landscape. Understanding how it works — and where it stops working — matters enormously for any provider practicing across state lines.
Definition and scope
Before the IMLC, a physician who wanted to practice in 10 states needed to complete 10 separate license applications, pay 10 sets of fees, and wait through 10 independent review processes. The Compact did not eliminate state authority over medical licensing — that would require a constitutional amendment, roughly speaking — but it created an agreed pathway that member states honor collectively.
As of 2024, the IMLC includes 40 member states plus Washington D.C. and Guam, representing the majority of the U.S. population. The Federation of State Medical Boards (FSMB) administers the Interstate Medical Licensure Compact Commission, which serves as the operational backbone of the system.
Scope matters here. The IMLC covers physicians holding an MD or DO degree. It does not extend to nurse practitioners, physician assistants, psychologists, or other licensed healthcare professionals — each of those professions has its own compact negotiations underway, at varying stages of adoption. For those providers, telehealth policy and regulation remains a patchwork of state-by-state rules.
How it works
The IMLC does not issue a single national license. Each participating state still issues its own license; the Compact simply accelerates and coordinates the process.
The eligibility requirements, as published by the IMLCC, are specific:
- Principal license in good standing — The physician must hold an unrestricted license in a Compact member state designated as their State of Principal License (SPL), typically where they live or practice primarily.
- Board certification — The physician must hold current certification from an ABMS or AOA member board.
- Graduate medical education — Completion of an accredited residency or fellowship is required.
- No pending investigations or restrictions — Any history of license action, disciplinary proceedings, or criminal convictions triggers additional review and may disqualify.
- One standard application — Eligible physicians submit one application through the IMLCC, select the member states where licensure is desired, and pay each state's individual fee.
Processing time under the Compact runs considerably faster than traditional applications — the IMLCC has reported average issuance timelines of approximately 30 days per state, compared to the 3-to-6-month timelines common with individual state applications. Each license issued is a full, unrestricted state license; it carries the same privileges and is subject to the same disciplinary authority as any license that state issues through its standard process.
Common scenarios
The IMLC shows up most visibly in three practice situations:
Telehealth group practices expanding coverage areas. A mental health platform operating in 12 states needs its psychiatrists licensed in all 12. Without the Compact, building that footprint takes the better part of a year per physician. With it, a board-certified psychiatrist with a clean record can be licensed across those states in a fraction of the time — a distinction that directly affects mental health telehealth access in states where provider shortages are most acute.
Rural and cross-border specialist coverage. A cardiologist practicing near a state border who sees patients from two or three adjacent states — a situation discussed in depth under telehealth for rural communities — can maintain licenses on both sides without enduring redundant full applications every renewal cycle.
Emergency and disaster response. When a public health emergency concentrates patient need in a specific state, physicians from neighboring states can obtain licenses quickly enough to actually respond. The COVID-19 pandemic exposed how slowly traditional licensure moved relative to the speed of a health crisis, a lesson embedded in subsequent telehealth post-pandemic policy changes.
Decision boundaries
The IMLC is a powerful tool with specific edges. Knowing where it ends is just as important as knowing what it does.
IMLC vs. state registration programs. Some states — notably California, which is not a Compact member — have created their own telehealth registration or temporary practice frameworks. These are not substitutes for IMLC membership and do not interact with it. A physician licensed in 39 Compact states still needs a separate California license through the Medical Board of California's standard process.
Compact licensure vs. prescribing authority. An IMLC license grants authority to practice medicine in the issued state. It does not override the state's telehealth prescribing rules, which govern what can be prescribed, to whom, and under what clinical conditions. Controlled substance prescribing in particular remains governed by the DEA registration and individual state controlled substances schedules, not by the IMLC.
What the Compact cannot fix. Credentialing at hospitals and health systems is handled institution by institution, not by licensure compacts. A physician with licenses in 20 states still needs to complete each hospital's credentialing process to practice there — a friction point addressed separately in telehealth credentialing and privileging. Similarly, malpractice coverage must be confirmed for each state of practice, as insurers price and restrict coverage geographically.
The IMLC represents a genuine structural improvement in how physician licensure moves across state lines. It is not a universal solution — it covers one profession, excludes two major jurisdictions (California and New York joined in 2024, but implementation timelines vary), and does nothing about the downstream credentialing and insurance questions that follow every new license. But within its defined scope, it removes real friction from the path between a qualified physician and a patient who needs care.