What Is a Resident Doctor?

Hospitals use a handful of titles for doctors at different stages. The table runs from the bottom of the ladder to the top.

PGY stands for postgraduate year. It counts the years since you finished medical school, so a third-year internal medicine resident is a PGY-3. The count keeps going into fellowship: a doctor who finished that 3-year residency and is in the first year of a cardiology fellowship is a PGY-4.

"Intern" is the everyday name for a PGY-1, as Science Insights explains. Interns are residents, and they hold the same degree as everyone else on the ladder above them.

Medical students are at the bottom of the table because they haven't graduated. The Bureau of Labor Statistics notes that medical students "work with patients under the supervision of experienced physicians," which is why you'll often see them on the same team as residents.

The ACGME, which accredits US residency and fellowship programs, counted 167,083 active residents and fellows in the 2024-2025 academic year, spread across 13,762 accredited programs.

Of those trainees, 137,432 (82.3 percent) were in specialty programs, which is residency, and 29,651 (17.7 percent) were in subspecialty programs, which is mostly fellowship. Among the specialty-program trainees, the ACGME reported this mix of medical schools:

• US MD schools: 57.8 percent
• International medical schools: 22.5 percent
• US DO schools: 19.6 percent

So about 1 in 5 specialty-program trainees went to an osteopathic school, which matches what you'll see in the MD vs DO comparison: both degrees lead into the same residency programs.

In your last year of medical school, you apply to residency programs in your chosen specialty, interview, and then rank the programs you'd accept. The programs rank their applicants too, and the National Resident Matching Program's algorithm pairs the two lists. Results come out on Match Day in March. What happens on Match Day walks through that week and the match rates.

Your specialty sets the length of your residency. On the AMA's list, internal medicine and pediatrics take 3 years, general surgery takes 5, and neurological surgery takes 7. The timeline to becoming a doctor has the full table by specialty, plus the fellowship years some fields add on top.

Not fully, and the rules get looser as you move up. Residency programs follow ACGME supervision requirements, which define three levels. Dartmouth Health's resident supervision policy spells them out:

1. Direct supervision: The supervising physician is physically present with the resident and the patient.
2. Indirect supervision: The supervisor isn't in the room. Either they're on site and can be there right away, or they're reachable by phone or electronically.
3. Oversight: The supervisor reviews procedures and encounters after the care is given and gives feedback.

Interns start near the top of that list. The policy states that "PGY-1 level residents must be supervised either directly or indirectly, with direct supervision immediately available." Faculty hand off more patient care as each resident shows they can handle it, and the policy adds that "all patient care must be supervised by qualified faculty."

That's why a senior resident may run a team overnight while the attending is at home and reachable by phone. The resident makes the calls in the moment, and an attending is still responsible for the patients.

Residency is also a legal requirement. The BLS says that "all states require physicians and surgeons to be licensed," and that to qualify, candidates must graduate from an accredited medical school and complete residency training. You can't skip it and open a practice.

A lot, but there's a cap. The ACGME limits clinical and educational work, and residency programs write those limits into their own policies. These are the limits as written in UCLA's work hours policy:

• 80 hours a week, averaged over a four-week period.
• 1 day in 7 free from all clinical and educational duties, also averaged over four weeks.
• 24 hours maximum for a continuous scheduled shift, plus up to 4 more hours for patient safety and handoffs, so the longest possible day is 28 hours.
• 14 hours off after a 24-hour in-house call shift, and 8 hours off between regular shifts.
• In-house call no more often than every third night, averaged over four weeks.

Moonlighting, which means picking up extra paid clinical work, counts toward the 80 hours. And interns aren't allowed to moonlight at all: the policy says "PGY1s are not permitted to moonlight."

Because of that averaging, a resident can work more than 80 hours in a heavy week as long as the four-week average stays at or under 80.

Residents get a salary, which hospitals call a stipend. In the AAMC's 2025 Survey of Resident/Fellow Stipends and Benefits, as reported by the AMA, the average first-year stipend was $68,166. Pay climbs each year you stay in training.

From PGY-1 to PGY-8, the average rises by $26,049. Location moves the number more than one year of seniority does. The AMA's summary puts the weighted PGY-1 average at $77,649 in the Western region and $65,076 in the Southern region, a gap of $12,573.

To put the first-year number in context, try an estimate. If an intern worked the full 80-hour average every week of the year, that's 4,160 hours (80 times 52). At $68,166, that comes to about $16.39 an hour. Any week under the cap raises that hourly rate.

Raises have also lagged prices. The AMA reports that the PGY-1 stipend grew 2.2 percent in 2025, while inflation ran about 3 percent, so pay adjusted for the Consumer Price Index fell 0.48 percent from 2024 to 2025. For what happens to pay once training ends, see how much doctors make.

When residency ends, you have three main paths:

• Practice as an attending. You finish residency, get your full license, and practice in your specialty.
• Do a fellowship. The BLS says subspecialty training "includes additional training in a fellowship of 1 to 3 years." Cardiology, for example, is a fellowship after internal medicine.
• Get board certified. The BLS notes that board certification isn't required to practice, but it "may increase their employment opportunities." To earn it, you complete residency and pass a specialty certification exam.

If you're weighing specialties now, remember that the specialty you pick sets the length of your residency. The internal medicine vs family medicine comparison shows how two 3-year paths differ in scope, pay and match data.

• Is a resident a real doctor? Yes. Every resident has an MD or a DO and is in paid, supervised training.
• Is an intern the same as a resident? Yes. An intern is a first-year resident, or PGY-1.
• What's the difference between a resident and a fellow? A fellow has finished residency and is training in a subspecialty, like cardiology after internal medicine.
• What's an attending? A fully trained physician who supervises residents, fellows and students.
• How long is residency? 3 to 7 years on the AMA's list, depending on the specialty.
• Do residents get paid? Yes. The 2025 average was $68,166 for PGY-1 and $94,215 for PGY-8.
• How many hours do residents work? Up to 80 a week, averaged over four weeks, under ACGME rules.

All of this starts with getting into medical school, and that starts with the MCAT^®. If you're still studying, the PurpleCAT concept library breaks the exam's science into short topics you can work through one at a time.

Last verified October 30, 2026, against the ACGME's 2024-2025 statistics, the AAMC's 2025 stipend survey as reported by the AMA, and the BLS Occupational Outlook Handbook. Work-hour rules are quoted from one program's policy; check your own program's policy for its exact terms.