A licensed physician is a doctor who has completed medical school, passed a series of national exams, finished residency training, and received formal permission from a state medical board to practice medicine. In the United States, medicine is regulated state by state, meaning a physician needs a separate license in each state where they treat patients. Graduating from medical school alone does not make someone a licensed physician. The license is what grants legal authority to diagnose, treat, and prescribe.
What the License Actually Means
A medical license is a legal credential issued by a state medical board. It confirms that a doctor has met every educational, examination, and training requirement that state demands. Without one, a person cannot legally represent themselves as a physician or practice medicine in that state, even if they hold an MD or DO degree. Most states enforce this through their medical practice act, which restricts anyone without a valid license from seeing patients in a clinical capacity.
This is an important distinction. A medical school graduate who hasn’t yet obtained a license can’t independently treat patients, write prescriptions, or bill for clinical services. They can work in supervised training roles (like residency) or pursue non-clinical careers in research, consulting, or administration, but the license is the legal gateway to independent medical practice.
How a Doctor Earns a License
The path to licensure is long and has several non-negotiable steps. It typically takes 11 to 15 years after high school, depending on the specialty.
First comes a four-year undergraduate degree, usually with heavy coursework in biology, chemistry, and physics. Then four years of medical school, earning either an MD (Doctor of Medicine) or a DO (Doctor of Osteopathic Medicine). Both degrees lead to the same licensing pathway. During medical school, students begin taking the national licensing exams: the USMLE for MD candidates or the COMLEX for DO candidates. These exams are broken into multiple steps taken at different stages of training.
After medical school, every physician enters residency, a period of supervised clinical training in their chosen specialty. Residencies last three to seven years depending on the field. A family medicine residency runs three years, while neurosurgery can take seven. During or after residency, physicians pass the final step of their licensing exam and apply to their state medical board for a full, unrestricted license.
The Licensing Exams
MD graduates take the United States Medical Licensing Examination (USMLE), a three-step exam. Steps 1 and 2 are completed during medical school, and Step 3 is taken during residency. DO graduates take the equivalent COMLEX-USA exam, also divided into multiple levels. Most states require all steps to be passed within a seven-year window from the date the first step is completed.
States also limit how many times you can attempt each step. The most common cap is three attempts per step, though it varies. Alabama allows up to 10 total attempts across all USMLE steps, while Alaska limits candidates to just two attempts per step. Failing too many times can permanently block licensure in certain states.
State-by-State Licensing
There is no single national medical license in the United States. Each state issues its own license and sets its own requirements. While the core elements are the same everywhere (medical degree, exams, residency), states differ on details like exam attempt limits, background check procedures, and application fees. A physician licensed in California cannot practice in New York without obtaining a separate New York license.
For doctors who need to practice across state lines, the Interstate Medical Licensure Compact offers a streamlined process. It doesn’t issue a single multi-state license. Instead, it speeds up the paperwork so qualified physicians can get individual licenses in multiple member states more quickly. The application fee is $700, plus whatever each state charges for the license itself. To qualify, a physician must hold a full, unrestricted license in at least one compact state, have no disciplinary history, no criminal record, and hold current board certification. They also need to have passed each component of the USMLE or COMLEX in no more than three attempts.
International Medical Graduates
Doctors who attended medical school outside the United States and Canada face additional steps before they can be licensed. They must first earn certification from the Educational Commission for Foreign Medical Graduates (ECFMG), which verifies their medical education credentials and requires passing USMLE Steps 1 and 2. Their medical school must be listed in the World Directory of Medical Schools with a specific ECFMG notation confirming it meets eligibility standards, and they must have completed at least four credit years of medical education.
Beyond the exams, international graduates must demonstrate clinical and communication skills, typically through an ECFMG Pathway that includes passing an occupational English proficiency test. ECFMG verifies every applicant’s diploma directly with the issuing school and reviews their transcript. After certification, the graduate still needs to complete an accredited residency in the U.S. and pass USMLE Step 3 before a state will grant a full license.
Licensed vs. Board-Certified
These two terms are related but different. A medical license is the legal minimum required to practice medicine. Board certification is a voluntary, additional credential that signals advanced expertise in a specific specialty like cardiology, orthopedic surgery, or pediatrics. A licensed physician can legally practice without board certification, but the majority of physicians in the U.S. do hold specialty certification through the American Board of Medical Specialties (ABMS) or the AOA Bureau of Osteopathic Specialists.
Board certification matters in practical ways. Many hospitals and insurance networks require it for privileges or participation. Patients checking a doctor’s qualifications will often see both a license number and a board certification status. The license says “this person can legally practice.” The certification says “this person has demonstrated specialized knowledge beyond the license requirements.”
Keeping a License Active
A medical license isn’t permanent in the “set it and forget it” sense. Physicians must renew their license on a regular cycle, typically every two years. Renewal requires completing continuing medical education (CME). In Georgia, for example, physicians must complete at least 40 hours of board-approved CME every two years. Most states have similar requirements, though the exact number of hours and the types of courses that count can vary.
State medical boards also have the authority to discipline or revoke a license. Common grounds include malpractice, substance abuse, criminal convictions, or practicing outside the scope of one’s training. Any disciplinary action becomes part of the physician’s permanent record, maintained through a national credentials verification system run by the Federation of State Medical Boards. This record follows a physician for their entire career, regardless of which state they move to.
How to Verify a Physician’s License
Every state medical board maintains a public database where you can look up whether a specific doctor holds a valid license. You can search by the physician’s name and see their license status, any disciplinary actions, and in many cases their education and training history. The Federation of State Medical Boards also offers a national search tool that pulls data from multiple states at once. If a physician’s license is listed as “active” and “unrestricted,” it means they are currently authorized to practice medicine in that state with no limitations on what they can do within their training.