Internal medicine residency takes three years. The program requires 36 months of supervised training, with at least 30 of those months spent in clinical experiences like hospital wards, intensive care units, and outpatient clinics. After completing all three years, you’re eligible to sit for the board certification exam.
What the Three Years Look Like
Each year of residency builds on the last, with increasing responsibility and independence. Residents are identified by their postgraduate year: PGY-1 (intern year), PGY-2, and PGY-3.
The intern year is the most structured. You spend the majority of your time on inpatient ward services, rotating through hospitals and often a VA medical center. A typical first-year schedule includes four to six weeks in a medical intensive care unit, five to six months on inpatient wards, two weeks in emergency medicine, and several weeks of electives. Your medical knowledge grows fast, but so does the emotional weight of being responsible for sick patients for the first time.
In the second year, you take on a leadership role. Instead of being supervised on every decision, you’re now the senior resident running teaching teams and guiding interns. ICU time increases to two or three months, and you get more elective time to explore subspecialties that interest you. You also continue seeing your own panel of outpatients in a weekly continuity clinic, a thread that runs through all three years of training.
The third year shifts toward refining your skills and preparing for what comes next. You’ll have three to five months of elective rotations, often tailored to a future career in a subspecialty or general practice. Most programs dedicate significant time to board exam preparation, with some setting aside a full month for review. By the end of PGY-3, you’re functioning close to the level of an attending physician.
Categorical vs. Preliminary Tracks
Not everyone who starts an internal medicine residency completes all three years in the same program. There are two main types of positions. A categorical position is the full three-year track that leads to board certification in internal medicine. A preliminary position lasts only one to two years and serves as a stepping stone into an advanced specialty like dermatology, radiology, or ophthalmology. If you matched into an advanced program, you typically need to complete a preliminary internal medicine year first to build foundational clinical skills before moving on.
Combined Programs Take Longer
If you want to train in internal medicine alongside another specialty, combined residency programs let you do both, though they add time. Internal medicine-pediatrics (Med-Peds) is the most common, taking four years instead of the three you’d need for either specialty alone. Internal medicine-psychiatry takes five years. These programs save at least a year compared to completing each residency separately, but they demand a broader range of skills and a longer commitment before you’re fully trained.
Adding a Fellowship
Board certification in internal medicine qualifies you to practice as a general internist or hospitalist. But if you want to specialize further, you’ll need a fellowship after residency. The major subspecialties each require additional years of training beyond those initial three:
- Cardiology: 3 years
- Gastroenterology: 3 years
- Hematology and oncology: 3 years
- Pulmonary and critical care: 3 years
That means a cardiologist, for example, completes six years of postgraduate training after medical school: three years of internal medicine residency plus three years of cardiology fellowship. Shorter fellowships exist for subspecialties like infectious disease, geriatrics, and hospice and palliative medicine, which typically run one to two years.
The Research Pathway
Physicians aiming for careers as physician-scientists can take a modified route through the American Board of Internal Medicine’s Research Pathway. Instead of the standard 36 months of clinical residency, this track requires 24 months of internal medicine training (with at least 20 months of direct patient care), followed by at least three years of research at 80 percent commitment. Planning for this track ideally starts during intern year, with formal notification to the board by spring of PGY-2. After the research phase, you still need to complete the minimum clinical fellowship training for your subspecialty, which ranges from 12 months for fields like nephrology or rheumatology up to 24 months for cardiovascular disease.
Work Hours During Training
Residents are capped at 80 hours of work per week, averaged over four weeks. No single shift can exceed 24 hours of continuous clinical work, though up to four additional hours are allowed for handoffs and education (not new patient care). You’re guaranteed at least one day off per week on average, and programs must provide at least 14 hours free after a 24-hour call shift. These limits apply across all residency years, though the intern year tends to feel the most grueling because everything is new.
What Residents Earn
Resident salaries rise modestly each year. At George Washington University, for example, the 2026 pay scale starts at about $74,900 for PGY-1 and reaches roughly $81,500 by PGY-3. These figures are representative of academic medical centers in high-cost areas. Salaries vary by institution and region but generally fall in the $60,000 to $80,000 range for the first three years nationally. If you continue into fellowship (PGY-4 through PGY-6 or beyond), pay continues to increase incrementally, reaching into the low-to-mid $90,000s at the senior fellow level.
Time Off and Extensions
Most programs provide three weeks of vacation per year. The board allows up to five weeks (35 days) per academic year of total time away, covering vacation, illness, parental leave, and any other absences combined. If you exceed that five-week limit in any training year, you’ll need to extend your residency to make up the missed time. For smaller deficits of 35 days or less, your program director can attest that you’ve met the required competencies without requiring extra training time.