A board exam in medicine is a standardized test that physicians must pass at various stages of their career, either to earn a license to practice or to prove expertise in a specific medical specialty. The term gets used loosely because there are actually several different board exams, and they serve different purposes. Some are required by law before you can see patients. Others are voluntary but increasingly expected by hospitals and insurers.
Understanding which exams exist, when they happen, and what they mean is useful whether you’re considering a career in medicine, preparing for the exams yourself, or simply trying to understand what “board certified” means on your doctor’s profile.
Licensing Exams vs. Certification Exams
The confusion around “board exams” comes from the fact that two separate systems exist, and people use the same phrase for both.
Licensing exams are legally required. Every physician in the United States must pass a multi-step licensing exam sequence to practice medicine in any state. These exams test general medical competence and are not specific to any specialty. State medical boards, coordinated through the Federation of State Medical Boards, grant licenses on a state-by-state basis. Without a license, you cannot legally diagnose or treat patients.
Board certification exams are voluntary. After completing residency training in a specialty like cardiology, surgery, or pediatrics, a physician can take an additional exam administered by a specialty board under the American Board of Medical Specialties (ABMS). Passing this exam demonstrates, in the ABMS’s words, “exceptional expertise in a particular specialty and/or subspecialty of medical practice.” It’s not legally required to practice, but many hospitals, insurance networks, and employers expect it.
The USMLE: Three Steps to a Medical License
For graduates of MD-granting medical schools, the licensing pathway is the United States Medical Licensing Examination, or USMLE. It’s a three-step exam sequence spread across medical school and early postgraduate training.
Step 1 tests foundational science knowledge: anatomy, physiology, pharmacology, pathology, and the biological mechanisms behind disease. Most students take it during or after their second year of medical school. Since January 2022, Step 1 has been scored as pass/fail only, ending the era of three-digit scores that once played a major role in residency applications. The passing standard on the old scoring scale was 196. In 2025, 93% of first-time test-takers from US MD schools passed, along with 89% from DO schools and 75% from international medical schools. The registration fee is $695.
Step 2 CK (Clinical Knowledge) evaluates the ability to apply medical concepts to patient care scenarios. Students typically take it in their third or fourth year, after clinical rotations. Pass rates are higher here: 98% for US MD graduates and 96% for DO graduates on first attempt. It also costs $695.
Step 3 tests readiness for unsupervised medical practice. Most physicians take it during their first or second year of residency. It’s the final exam required for full medical licensure and costs $955.
The COMLEX: A Parallel Path for DO Students
Graduates of osteopathic medical schools (those earning a DO degree rather than an MD) have their own licensing exam series called the Comprehensive Osteopathic Medical Licensing Examination, or COMLEX-USA. Administered by the National Board of Osteopathic Medical Examiners, COMLEX follows a similar three-level structure but includes content on osteopathic principles and manipulative treatment.
COMLEX tests knowledge across two dimensions: patient presentation and physician tasks. It’s designed to assess what an osteopathic generalist physician needs to know for unsupervised practice. Many DO students choose to take both the COMLEX and the USMLE, particularly if they’re applying to residency programs that may be more familiar with USMLE scores.
How International Graduates Enter the System
International medical graduates (IMGs) follow a different route into US medical practice. Before they can enter a residency program, they need certification from the Educational Commission for Foreign Medical Graduates (ECFMG, now part of Intealth).
To earn ECFMG certification, an IMG must graduate from a medical school listed in the World Directory of Medical Schools with an ECFMG Sponsor Note, complete at least four credit years of medical education, and pass both USMLE Step 1 and Step 2 CK. There’s also a clinical skills and communication requirement, which currently involves completing an approved ECFMG Pathway that includes a satisfactory score on the Occupational English Test for Medicine. Once certified, IMGs can apply for residency positions and eventually complete Step 3 to obtain full licensure.
Specialty Board Certification After Residency
Once a physician finishes residency, they become eligible for the exam most people think of when they hear “board certified.” This is the specialty certification exam, administered by one of the 24 member boards of the ABMS. Each specialty has its own board: the American Board of Internal Medicine handles internal medicine, the American Board of Surgery handles surgical specialties, and so on.
The general requirements for certification are consistent across specialties. A candidate must hold a medical degree (MD or DO), have completed three to seven years of accredited residency training depending on the specialty, hold an unrestricted medical license, and provide letters of attestation from program faculty. Then they sit for a specialty-specific exam covering the clinical knowledge and judgment expected in that field.
Subspecialty certification adds another layer. A physician who is already board certified in internal medicine, for example, can pursue additional certification in cardiology or gastroenterology after completing a fellowship. This requires passing yet another exam in the subspecialty discipline.
Maintaining Certification Over Time
Board certification is not permanent. Physicians must participate in an ongoing process called Maintenance of Certification (MOC) to keep their status current. The specifics vary by specialty board, but the general framework involves earning at least 100 MOC points every five years through educational activities and quality improvement projects, plus passing a periodic knowledge assessment.
Boards now offer several assessment formats. Some allow a traditional exam taken every ten years. Others offer a longitudinal knowledge assessment, where physicians answer a smaller number of questions on a rolling basis throughout the year rather than sitting for a single high-stakes test. There are also collaborative pathways tied to practice improvement efforts. The goal is to verify that a physician’s knowledge stays current as medical science evolves.
Why “Board Certified” Matters in Practice
For patients, seeing “board certified” on a physician’s credentials means that doctor passed a rigorous specialty exam beyond what’s required for basic licensure. It signals that an independent organization verified their expertise in a specific area of medicine. Many hospitals require board certification for staff privileges, and some insurance plans use it as a credentialing criterion.
For physicians, the distinction between being licensed and being board certified is significant. Licensure is the legal floor: it confirms minimum competency to practice medicine safely. Board certification sits above that floor and is tied to career advancement, hospital privileges, and professional reputation. A physician can legally practice without board certification, but doing so increasingly limits where and how they can work.