Key Takeaways
- In US medicine, internship and residency aren’t separate programs. Internship is simply PGY-1, the first year of residency.
- According to the AAMC’s 2025 Survey of Resident/Fellow Stipends and Benefits, the national average PGY-1 salary is $68,166 per year. Resident pay rises with each training year, usually by a few thousand dollars annually.
- Outside the US, many countries run internship as a standalone program completed before residency applications, which means the terminology doesn’t translate directly for international medical graduates.
In US medicine, internship usually refers to PGY-1, the first year of residency. It is not a separate program that comes before residency, which is why the terminology can confuse medical students, pre-meds, and international applicants who learned the terms in a different system.
The residency vs internship difference becomes clearer once you look at how postgraduate training works in practice: what each term means, how long training lasts, what daily responsibilities look like, how supervision works, how residents are paid, and how the language changes across countries.
What Is a Medical Internship?
In the US, an internship is PGY-1, the first year of residency. That’s the complete definition. It’s not a bridge program, a pre-residency requirement, or an optional step. It’s year one of your specialty training.
Interns train under the highest level of supervision in the entire residency program. Every clinical decision is reviewed by a senior resident or attending physician. Interns write progress notes, admit patients, present cases on rounds, and place orders, but they don’t act independently.
Historically, internship was a standalone program. Before residency training was formalized and expanded, medical graduates completed a rotating internship year before applying to specialty programs separately. That model was phased out as residency programs became longer and more structured under ACGME oversight. The standalone internship effectively merged into PGY-1.
The two remaining exceptions are Transitional Year (TY) and Preliminary (Prelim) programs. Transitional year programs offer a broad-based clinical experience across internal medicine, surgery, and elective specialties, providing a sampling of multiple disciplines. Preliminary programs are typically specialty-specific one-year PGY-1 positions in internal medicine or surgery that satisfy the first-year clinical requirement for advanced specialty programs that begin at PGY-2. Both count as PGY-1 training. Neither leads to board certification on its own.
What Is a Medical Residency?
Residency is the multi-year postgraduate specialty training program that follows medical school. It begins with the intern year (PGY-1) and continues until the physician has completed the full training length required for their specialty.
Length varies considerably by field. Common examples:
- Family Medicine: 3 years
- Internal Medicine: 3 years
- Pediatrics: 3 years
- Emergency Medicine: 3 to 4 years
- OB/GYN: 4 years
- General Surgery: 5 years
- Neurosurgery: 7 years
All US residency programs must be accredited by the ACGME (Accreditation Council for Graduate Medical Education). Completing an ACGME-accredited residency and passing the relevant specialty board exam leads to board certification, which is the credential required to practice independently as a fully licensed attending physician.
Residency is where the specialization actually happens. Whether you’re training in medical specialties like cardiology or procedural fields like surgery, the years in residency are the time physicians build the depth of clinical expertise needed for independent practice.
Residency vs Internship: Key Differences
The most important framing point is this: internship and residency are not separate programs in the US. Internship is PGY-1. Residency is the full multi-year program that includes the intern year. You don’t complete an internship and then apply to residency. You match into residency, and your first year of that residency is called internship.
Structure
Internship is PGY-1 of a residency program. Residency is the entire program, beginning with PGY-1.
Take internal medicine as an example. The full program is three years. PGY-1 is the intern year, with the highest supervision and the broadest range of rotations. PGY-2 and PGY-3 are the senior resident years, with progressively greater autonomy and a deeper focus on the specialty.
Both terms describe phases of the same continuous training, not two different tracks.
Length
Internship: always 12 months. There’s no shorter or longer version.
Residency total: 3 to 7 years, depending on specialty. The intern year counts as year one of that total, not as time added on top of it.
Training scope
Intern year is broad and rotational. PGY-1 residents move through multiple departments and service types, building foundational clinical mechanics across a range of settings.
Senior residency years (PGY-2 onward) narrow in. The training focuses on the chosen specialty and its subspecialties, and the cases become progressively more complex and responsibility-laden.
The practical implication: interns sample a wide range of clinical environments and learn how hospitals function. Senior residents go deep on one area and learn how to manage it independently.
Supervision level
Interns have the least autonomy of anyone on the medical team above a student. Every clinical decision is reviewed before it stands.
Senior residents gain meaningful autonomy year by year. A PGY-3 in internal medicine functions very differently from a PGY-1 in the same program. Final-year and chief residents often run teams, supervise more junior residents, and communicate directly with attendings about complex management decisions.
Attendings remain ultimately responsible for all patient care at every level.
Day-to-day responsibilities
Interns handle the core mechanics of clinical care: admitting patients, writing daily progress notes, entering orders, drawing labs, and presenting cases on rounds. The volume is high and the work is detailed.
Senior residents manage teams, handle higher-stakes diagnostic and treatment decisions, perform advanced procedures, and take on greater communication responsibility with attendings, consultants, and families.
Put simply: interns learn how to function in a clinical environment, while senior residents learn how to make sound judgment calls within their specialty.
Title used
PGY-1 residents are called “interns” or “first-year residents.” Both terms refer to the same person.
PGY-2 and above are called “residents,” sometimes “senior residents.” In the final year of a program, a resident may be called a “chief resident,” a role that carries additional administrative and teaching responsibilities.
All of these, intern through chief, are technically residents in a residency program. “Intern” is a subset of “resident,” not a separate category.
Salary
According to the 2025 AAMC Survey of Resident/Fellow Stipends and Benefits, the nationwide unweighted average stipends were $68,166 for PGY-1, $70,499 for PGY-2, and $73,301 for PGY-3. Annual raises typically fall in the 3% to 5% range, adding roughly $2,000 to $4,000 per year, with the total increase from PGY-1 to PGY-8 amounting to approximately $26,000.
Salary is set at the institutional level and doesn’t vary by specialty. All residents at the same PGY level in the same program earn the same stipend, regardless of whether they’re in family medicine or neurosurgery.
The big transition: intern to senior resident
July 1 is the day residents across US training programs move up one PGY level. For interns, that means the formal transition from PGY-1 to PGY-2.
This is often the sharpest jump in responsibility during residency. The interns who finished their first year the day before become the residents supervising new interns the next morning. They review orders, answer overnight questions, and begin making more independent management decisions.
The role changes quickly, even though the preparation takes the full intern year. That is why the PGY-1 to PGY-2 transition is such an important marker in graduate medical education: it is the end of internship and the beginning of senior residency.
What “Internship” Means Outside the US
This is where the terminology gets genuinely confusing for international readers, because internship in many other countries isn’t PGY-1 of residency. It’s a formally separate program completed before residency applications even begin.
A few examples:
- United Kingdom: The UK Foundation Programme runs for two years (FY1 and FY2) and bridges medical school and specialty training. Foundation Year 1 is equivalent to an internship, and Foundation Year 2 is an additional year of experience. Specialty training follows and ranges from 3 years for general practice to 8 years for hospital-based specialties.
- India: A compulsory one-year rotational internship after MBBS (Bachelor of Medicine, Bachelor of Surgery) is required for permanent registration with the National Medical Commission before students can sit postgraduate entrance exams. The MBBS internship is a mandatory program included in the MBBS course, whereas the residency program is a postgraduate program with a different purpose.
- Philippines: A one-year postgraduate internship is required after completing the MD degree and before sitting the licensure exam and applying to residency.
Australia, most of Europe, and the majority of Latin American countries follow similar patterns where internship is a distinct pre-residency stage.
The key implication for international medical graduates applying to US programs: completing an internship abroad does not substitute for a US ACGME-accredited PGY-1. When you enter a US residency program, you start at PGY-1 regardless of prior postgraduate training completed in another country. That prior training isn’t irrelevant; it can strengthen your application, but it doesn’t let you skip the first year.
Caribbean medical school graduates don’t face this confusion. They train within the US and Canadian medical education framework and enter US residency on the same PGY-1 timeline as US MD and DO graduates. There’s no separate internship phase to complete before applying. For more on how Caribbean medical schools fit into the US training pathway, including how graduates perform in the Match, Caribbean medical school match rates are worth reviewing before you apply.
What Comes After Residency: Fellowship and Independent Practice
Once a physician completes residency and passes the relevant specialty board exam, they can practice as an attending physician independently. This is the title and scope that most people picture when they think of a “doctor.”
Fellowship is the optional next step for subspecialty training. It runs one to three years after residency and is required for certain practice areas. Interventional cardiology, Mohs surgery, most pediatric subspecialties, and transplant surgery are examples where fellowship isn’t truly optional if you want to practice in that niche.
The full title progression in US medicine looks like this:
Medical student → Intern (PGY-1) → Resident (PGY-2 onward) → Fellow (during fellowship) → Attending physician
Each stage is sequential and builds on the previous one. You can’t skip a stage, and the titles shift with the milestones.
Understanding the Full Path
Internship isn’t something that happens before your medical career begins. It’s the first year of specialty training and one of the most formative periods of physician development. Senior residency, fellowship, and attending practice build from that foundation.
Knowing the correct terminology also matters practically. If you’re an international applicant using the word “internship” to mean a pre-residency year that you’ve already completed, a US program director won’t interpret it the same way. Getting the language right signals that you understand the US system.
Understanding the full path from medical school through residency and into practice is something worth mapping out early. Review the medical school length breakdown to see how the timeline adds up, or explore what it takes to become a doctor from the starting point of choosing a school.
Ready to look through your options? Use the Find Your Med School form to compare accredited Caribbean programs and start building the foundation for your residency application.
Frequently Asked Questions (FAQs)
Can an intern write prescriptions?
Yes. Licensed interns (PGY-1 residents) hold a medical license and can write prescriptions, but their orders are reviewed and co-signed by a senior resident or attending physician in most clinical settings.
What is a transitional year (TY) program?
A transitional year is a one-year ACGME-accredited PGY-1 program that rotates residents through multiple specialties, such as internal medicine, surgery, and electives. It satisfies the first-year clinical requirement for advanced specialty programs that begin at PGY-2, such as dermatology, radiology, and ophthalmology.
Can you practice independently after just internship?
No. Completing only PGY-1 does not qualify a physician to practice independently. Full residency training, board certification, and a state medical license are required for unsupervised practice as an attending physician.
