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Categorical Program

The Categorical Program in the MGH Department of Medicine comprises the majority of residents in the program.


Interns (PGY-1) in the Categorical Program divide their time between ambulatory training and inpatient general medical services; learning the basics of patient evaluation and management. Interns also rotate through the Emergency Room and the Medical Intensive Care Unit (MICU). Ambulatory patient care is emphasized through 3 months of time divided between the Ambulatory Care Rotation (ACR) and Ambulatory Subspecialty Rotations (ASR) as well as a weekly continuity primary care clinic. These provide a balance between inpatient and outpatient training. Elective blocks allow interns the opportunity to pursue experiences in a medical subspecialty, research, or another specialty area. Elective rotations in the Coronary Care Unit (CCU) are available for those interested in exposure to Cardiology. In addition, Categorical and primary care residents spend one month at Newton-Wellesley Hospital for a community medicine hospital experience.


During the junior (PGY-2) year, residents lead inpatient teams on the Bigelow Service, where they supervise patient care as well as provide education for interns and medical students. Junior residents also provide care for patients in the Coronary Care Unit (CCU), the Medical Intensive Care Unit (MICU) and the cardiac Step-Down Unit (SDU). More elective time during the PGY-2 year affords junior residents the opportunity to explore clinical subspecialties, research interests, as well as possible international experiences. The Ambulatory Care Rotation, the Ambulatory Subspecialty Rotations, and responsibilities in the Continuity Clinic comprise 3 months of block rotations.


The senior year (PGY-3) of residency is weighted toward leadership roles in the Emergency Room, the Coronary Care Unit, Step-Down Unit, the Medical Intensive Care Unit, and inpatient teams. Considerable time is spent providing education for junior residents, interns, and medical students. Senior residents are the primary providers responsible for in-hospital triage decisions as well as responding to emergency situations with leadership of the Code Team and the Rapid Response Team. Seniors also spend several weeks as medical consultants for the surgical and other non-medical services. Ambulatory Rotations and Ambulatory Subspecialty Rotations are maintained at 3 months for the year. Substantial elective time during the senior year is available to allow the pursuit of research opportunities and other independent studies as well as international experiences.

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Categorical NRMP Number: 1261140C0
Preliminary NRMP Number: 1261140P0
Primary Care NRMP Number: 1261140M0
Global Primary Care NRMP Number: 1261140M1
Neuro Prelim NRMP Number: 1261140P1