An MD is a Doctor of Medicine, the most common medical degree held by physicians in the United States. It’s a professional doctorate granted by allopathic medical schools, and it qualifies graduates to diagnose illness, prescribe medication, perform surgery, and provide the full range of medical care. Earning the degree and becoming a practicing physician takes a minimum of 11 years after high school, and often longer depending on specialty.
What the MD Degree Means
MD stands for “Doctor of Medicine,” from the Latin Medicinae Doctor. It’s classified as a terminal professional degree, meaning it’s the highest degree in its field and is designed to prepare someone for clinical practice rather than academic research. Allopathic medicine, the tradition behind the MD, focuses on diagnosing and treating symptoms and disease, typically through medications, procedures, and surgery.
In practical terms, a licensed MD can diagnose conditions, prescribe and administer treatments, order and interpret tests, perform surgical procedures, and manage patient care across virtually every medical setting. The specific scope of what any individual MD does depends on their chosen specialty.
How Long It Takes to Become an MD
The path to practicing as an MD has three major phases: undergraduate education, medical school, and residency training. Most people complete a four-year bachelor’s degree first, though medical schools don’t require a specific major. Pre-medical coursework in biology, chemistry, physics, and math is expected regardless of what you major in.
Medical school itself is four years. The first two years focus on foundational medical knowledge: anatomy, physiology, pharmacology, pathology, and the science behind how diseases develop and progress. During the third year, students begin clinical rotations, working directly with patients in hospitals and clinics across different specialties like internal medicine, surgery, pediatrics, and psychiatry. The fourth year allows for more specialized rotations, including “away rotations” at other institutions, which can help when applying for residency programs.
After earning the MD degree, graduates enter residency, a period of supervised hands-on training in their chosen specialty. Residency lasts three to seven years depending on the field. A family medicine residency is three years, while neurosurgery requires seven. Some physicians pursue additional fellowship training after residency to specialize even further, adding one to three more years.
Licensing and Board Certification
Holding an MD degree alone doesn’t mean someone can practice independently. Every physician in the U.S. must pass the United States Medical Licensing Examination (USMLE), a three-step process. Step 1 tests understanding of the basic sciences behind medicine. Step 2 evaluates clinical knowledge and the ability to apply it to patient care. Step 3, taken during residency, assesses readiness for unsupervised practice. All three steps must be passed before a state will issue a full medical license.
Board certification is a separate, voluntary credential that most physicians pursue. The American Board of Medical Specialties oversees 24 member boards that certify physicians across 40 specialties and 89 subspecialties. To become board certified, a physician must complete an accredited residency and pass an additional specialty-specific exam. While not legally required to practice, board certification signals a higher standard of expertise, and most hospitals and insurance networks expect it.
MD vs. DO: What’s the Difference
The other medical degree granted in the U.S. is the DO, or Doctor of Osteopathic Medicine. Both MDs and DOs can practice the full scope of medicine, prescribe medications, perform surgery, and specialize in any field. The practical differences have narrowed considerably over time, and since 2020, MD and DO graduates compete in the same residency match system.
The philosophical difference is that osteopathic programs have historically described their approach as more holistic, emphasizing the relationship between mind, body, and spirit. DO students also receive additional training in osteopathic manipulative treatment (OMT), a set of hands-on techniques involving stretching, gentle pressure, and resistance to diagnose and treat musculoskeletal problems. This adds extra coursework on the musculoskeletal system that MD programs don’t include.
Match rates for residency are nearly identical. In 2025, U.S. MD seniors matched at a rate of 93.5%, while DO seniors hit a record high of 92.6%. Both degrees lead to the same career paths, and patients are unlikely to notice a difference in day-to-day care.
Specialties MDs Can Practice
The range of specialties open to MDs is enormous. Primary care fields like family medicine, internal medicine, and pediatrics are the most common. Surgical specialties include general surgery, orthopedic surgery, cardiac surgery, and neurosurgery. Other paths include dermatology, radiology, anesthesiology, emergency medicine, psychiatry, obstetrics and gynecology, and oncology, among dozens of others.
Subspecializing narrows the focus even further. A physician who completes an internal medicine residency might go on to a cardiology fellowship, then subspecialize in interventional cardiology. With 89 recognized subspecialties, the degree of specialization available is remarkably specific.
Salary and Career Outlook
Physician salaries vary widely by specialty, location, and practice setting, but the overall numbers are high relative to other professions. According to the Bureau of Labor Statistics, the median annual wage for physicians and surgeons was $239,200 or higher as of May 2024. Surgical and procedural specialties tend to earn more than primary care, though primary care physicians still earn well above the national median for all occupations.
International Medical Graduates
Doctors who earn their medical degree outside the United States can also practice here, but the path involves additional steps. International medical graduates (IMGs) must obtain certification through the Educational Commission for Foreign Medical Graduates (ECFMG). This requires graduating from a medical school listed in the World Directory of Medical Schools, passing USMLE Steps 1 and 2, and meeting clinical skills and English communication requirements. The medical school must have completed at least four credit years of education, and ECFMG independently verifies each graduate’s diploma with the issuing school.
After ECFMG certification, IMGs apply to residency programs through the same match system as U.S. graduates. Completing a U.S. residency and passing USMLE Step 3 then qualifies them for a state medical license. The process is competitive, and IMGs often face additional hurdles in securing residency positions, but thousands successfully enter U.S. practice each year.