To become a practicing physician in the United States, you need either a Doctor of Medicine (MD) or a Doctor of Osteopathic Medicine (DO) degree, both of which require a bachelor’s degree first. The full path from freshman year of college to independent practice typically takes 11 to 15 years, depending on your specialty.
The Two Medical Degrees: MD and DO
There are two types of medical degrees that lead to full physician licensure. An MD comes from an allopathic medical school, while a DO comes from an osteopathic medical school. Both degrees allow you to practice medicine, prescribe medications, perform surgery, and specialize in any field.
The curriculum is structured similarly in both programs. You typically spend the first 12 to 24 months in the classroom and the remaining time in clinical rotations at hospitals and clinics. The key difference is that DO programs include training in osteopathic manipulative treatment (OMT), a set of hands-on techniques for diagnosing and treating illness, with extra focus on the musculoskeletal system. DO programs also tend to emphasize a holistic, whole-patient philosophy.
Since 2020, MD and DO graduates compete in the same residency match system, and both can pursue any specialty. Most residency programs accept either the USMLE (the licensing exam MD students take) or COMLEX-USA (the osteopathic licensing exam). In practical terms, the two degrees open the same doors.
Your Undergraduate Degree
Medical schools do not require a specific undergraduate major. You can major in biology, English, engineering, music, or anything else, as long as you complete the prerequisite science courses. Many premedicine students choose biology or chemistry simply because those majors overlap heavily with prerequisites, but admissions committees do not penalize non-science majors.
Each medical school sets its own prerequisites, so requirements vary. Nearly all schools require coursework in biology, general chemistry, organic chemistry or biochemistry, and physics, each with lab components. Many also require English composition, mathematics, or behavioral science courses like psychology or sociology. Expect to complete roughly two years of science coursework regardless of your major. A few important details to keep in mind:
- Lab work: Most schools require that lab sections be completed in person.
- AP credit: Policies differ significantly. Some schools accept Advanced Placement credit for prerequisites, while others require you to take additional upper-level courses in the same subject if you used AP credit to skip the introductory level.
- School-specific lists: Always check each school’s published requirements before applying. The AAMC’s Medical School Admission Requirements database is the most reliable source for this.
The MCAT
Nearly every MD and DO program requires the Medical College Admission Test (MCAT). This standardized exam covers biological and biochemical foundations, chemical and physical foundations, psychological and social foundations of behavior, and critical analysis and reasoning skills. Most students take the MCAT during the spring or summer before their application year, typically in their junior year of college. Preparing for the exam usually takes three to six months of dedicated study.
Medical School: Four Years
Medical school is a four-year program. The first two years focus on foundational sciences: anatomy, physiology, pharmacology, pathology, and medical ethics. You will also begin learning clinical skills through standardized patient encounters and small-group exercises. The final two years are spent rotating through core clinical specialties, including internal medicine, surgery, pediatrics, obstetrics and gynecology, psychiatry, and family medicine. These rotations take place in hospitals and outpatient clinics, and they help you decide which specialty to pursue.
During your fourth year, you apply to residency programs through a national matching system. You submit applications, interview at programs across the country, and then rank your preferences. A computer algorithm matches you to a program based on both your rankings and the programs’ rankings of you.
Residency and Fellowship Training
A medical degree alone does not make you a fully independent physician. After graduating, you must complete residency training in your chosen specialty. Primary care specialties like family medicine, internal medicine, and pediatrics require three years of residency. Surgical specialties tend to be longer, with general surgery requiring five years and some subspecialties extending further. Overall, residency lasts anywhere from three to seven years depending on the field.
If you want to subspecialize further (for example, becoming a cardiologist after completing internal medicine residency, or a hand surgeon after general surgery), you will need an additional fellowship lasting one to three years. Fellowship is optional for many physicians but required for certain subspecialty practices.
During residency and fellowship, you hold the title of doctor and treat patients, but you work under the supervision of attending physicians. You earn a salary during this time, though it is modest relative to the hours worked.
Licensing and Board Certification
To practice medicine independently, you need a state medical license. Licensing requires passing a multi-step exam series. MD graduates take the United States Medical Licensing Examination (USMLE), which has three steps spread across medical school and residency. DO graduates take COMLEX-USA, though many also take the USMLE. You must pass all steps and complete at least one year of residency to qualify for a license in most states.
Board certification is a separate credential from licensure. After completing residency, you can sit for a specialty board exam administered by organizations like the American Board of Medical Specialties. Board certification is not legally required to practice, but most hospitals and insurance networks expect it, making it a practical necessity.
Combined BS/MD Programs
If you are a high school student certain about pursuing medicine, combined baccalaureate-MD programs let you earn both your bachelor’s degree and your MD through a single admissions process. These programs shave one or two years off the traditional timeline. For the 2025-2026 academic year, the AAMC lists programs ranging from six to nine years in total length, though most are seven years. Over 30 schools across the country offer this pathway.
Admission to combined programs is highly competitive, typically requiring top grades and test scores in high school. The trade-off is that you secure your medical school seat early and skip the standard MCAT-and-application cycle. However, these programs limit your flexibility if you change your mind about medicine or want to attend a different medical school later.
The Full Timeline
Here is what the standard path looks like from start to finish:
- Undergraduate degree: 4 years
- Medical school (MD or DO): 4 years
- Residency: 3 to 7 years, depending on specialty
- Fellowship (if subspecializing): 1 to 3 additional years
A family medicine physician following the fastest traditional route finishes training about 11 years after starting college. A neurosurgeon or cardiac surgeon may train for 15 years or more. Combined BS/MD programs can trim the undergraduate portion by a year or two, but residency and fellowship requirements remain the same regardless of how you earned your medical degree.