A medical internship is the first year of residency training after medical school, formally known as the PGY-1 (postgraduate year one) year. It’s the point where a new doctor transitions from student to physician, taking on real patient care responsibilities under supervision. In the U.S., nearly every medical school graduate must complete this year before advancing in their specialty training.
Where Internship Fits in Medical Training
The path to becoming a fully independent physician in the U.S. follows a clear hierarchy. After four years of medical school, graduates enter residency. The first year of residency is the internship. After completing all residency years (which range from three to seven depending on the specialty), a doctor becomes an attending physician, fully board-certified and able to practice independently. Some doctors pursue an additional step called a fellowship for subspecialty training before reaching attending status.
During the intern year, you’re a licensed physician but not yet independent. An attending physician holds final responsibility for every patient you care for, even when you’re the one writing orders and making initial clinical decisions. Senior residents, typically in their second or third year, also guide interns through day-to-day work. This layered supervision is deliberate: it lets new doctors build clinical judgment while keeping patients safe.
Types of Internship Positions
Not all internships are structured the same way. A categorical position offers a guaranteed track through the full residency in a given specialty. If you match into a categorical internal medicine spot, for example, you’ll complete all three years at that program without needing to reapply. A preliminary position, by contrast, offers only one to two years of training, generally as preparation before entering an advanced specialty program like radiology or dermatology that doesn’t include its own first year. Transitional year programs fall into this preliminary category as well, but they rotate interns through multiple specialties rather than focusing on one, giving a broader clinical foundation before the trainee moves on.
How Interns Get Placed
Most internship positions are filled through the National Resident Matching Program, commonly called “the Match.” Fourth-year medical students apply to programs, interview, and then submit a ranked list of their preferred programs. Programs do the same with their preferred applicants. A computer algorithm then pairs them up, working through each applicant’s list from top choice downward. If your first-choice program also ranked you highly enough, you match there. If not, the algorithm moves to your second choice, and so on. Once every applicant’s list has been processed, all tentative matches become final and binding. Results are announced on Match Day, typically in mid-March, and training begins that July.
What Interns Actually Do Each Day
The intern year is largely spent on inpatient hospital rotations. On a typical day, interns arrive early to review overnight developments for their patients, then join the team for morning rounds, where they present updates and discuss treatment plans with senior residents and attending physicians. The core responsibilities include evaluating new admissions, performing initial history and physical exams, developing a workup and management plan for each patient, and writing daily progress notes and discharge summaries.
A significant portion of the day involves clinical documentation and entering orders into the electronic medical record. Interns also maintain patient lists and prepare handoff reports for the night team, a critical safety step that ensures the overnight physician knows each patient’s status, active problems, and what to watch for. Between these tasks, interns field pages from nurses, follow up on lab results, coordinate with consultants, and respond to changes in their patients’ conditions. The work is hands-on and constant.
Supervision and Growing Independence
Interns don’t operate in a vacuum. Early in the year, supervision is tight. For many clinical tasks, a supervising physician must be physically present (direct supervision). As the intern demonstrates competence, they gradually shift to indirect supervision, where an attending or senior resident is quickly available but not standing in the room. By the end of the year, some tasks can be performed with a supervisor reachable by phone. This progression is intentional: it mirrors how trust and skill develop over twelve months of intensive practice. Interns never reach fully unsupervised status during PGY-1, but the degree of autonomy increases noticeably from July to June.
Work Hours and Lifestyle
Intern year is widely regarded as the most physically demanding period in a doctor’s career. National regulations cap the work week at 80 hours, averaged over four weeks. Individual shifts can last up to 24 hours, with a possible 6-hour extension for patient handoffs and education. Interns must get at least one full 24-hour period off per week and at least 10 hours of rest between shifts. In-house overnight call is limited to no more than every third night.
Many programs use a “night float” system to stay within these limits. Instead of traditional overnight call where an intern works a full day and then stays through the night, a dedicated intern covers night shifts (roughly 7 p.m. to 7 a.m.) for a stretch of days while their colleagues handle daytime duties. This structure helps manage fatigue, though the hours still far exceed a typical 40-hour work week. The combination of long hours, high stakes, and a steep learning curve makes the intern year both formative and exhausting.
Licensing Milestones During Internship
The intern year also carries an important licensing requirement. Most residency programs require interns to pass the final medical licensing exam (Step 3 of the USMLE, or Level 3 of the COMLEX for osteopathic physicians) before advancing to PGY-2. This is the last of three licensing exams medical students and new doctors take, and it focuses on independent clinical decision-making. Failing to pass during intern year can delay progression in training.
Compensation
Medical interns are paid, though modestly relative to their hours and level of education. At UCLA, for instance, PGY-1 salary for the 2025-2026 academic year is approximately $93,777. Salaries vary by institution and region, but most programs fall within a similar range nationally. Benefits typically include health insurance and some form of meal stipend or housing allowance. Pay increases incrementally with each subsequent year of residency, and the jump to attending-level compensation after residency is substantial.
Why the Intern Year Matters
The intern year is where classroom knowledge meets real clinical responsibility for the first time. It builds the foundational skills that every physician carries through the rest of their career: managing acutely ill patients, communicating with families, making decisions under uncertainty, and functioning within a medical team. For many doctors, it’s the year that shapes how they practice medicine for decades. It’s grueling by design, compressing an enormous amount of learning into twelve months, but it’s also the threshold between being a student and being a doctor.