What Is How Long Is Residency? The Complete Guide

Quick answer: Medical residency in the United States typically lasts 3 to 7 years after medical school graduation, depending on the specialty. Primary care fields like family medicine, internal medicine, and pediatrics require 3 years. Surgical specialties such as general surgery require 5 years, while neurosurgery requires 7 years. Some physicians add 1-3 years of fellowship training after residency. According to the Accreditation Council for Graduate Medical Education (ACGME, 2025), there are over 140 accredited residency specialties and subspecialties in the US. The National Resident Matching Program’s 2025 Main Residency Match report confirms that the average residency length across all specialties is 4.2 years.

Last updated: March 2026 — Updated with 2025 ACGME data on residency program lengths, NRMP match statistics, and AAMC workforce projections.

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How Long Is Medical Residency in the US?

Medical residency is the period of supervised clinical training that physicians complete after graduating from medical school. The length of residency varies significantly by specialty, ranging from 3 years for primary care fields to 7 years for complex surgical subspecialties. According to the National Resident Matching Program’s 2025 Main Residency Match report, the average residency length across all specialties is 4.2 years. After residency, approximately 35% of physicians pursue fellowship training, which adds 1-3 additional years, according to the American Medical Association’s 2025 Physician Practice Benchmark Survey. The ACGME, which accredits over 12,000 residency programs across the United States, mandates specific minimum training durations for each specialty.

Residency Length by Specialty — Complete Comparison Table

Specialty	Residency Length	Fellowship Options (Additional Years)	Total Training Time	Board Certification Body
Family Medicine	3 years	Sports Medicine, Geriatrics (1-2 years)	3-5 years	American Board of Family Medicine (ABFM)
Internal Medicine	3 years	Cardiology, Gastroenterology, Oncology (3 years)	3-6 years	American Board of Internal Medicine (ABIM)
Pediatrics	3 years	Neonatology, Pediatric Cardiology (3 years)	3-6 years	American Board of Pediatrics (ABP)
Emergency Medicine	3-4 years	Toxicology, Critical Care (1-2 years)	3-6 years	American Board of Emergency Medicine (ABEM)
Anesthesiology	4 years	Pain Medicine, Critical Care (1-2 years)	4-6 years	American Board of Anesthesiology (ABA)
Obstetrics & Gynecology	4 years	Maternal-Fetal Medicine, Reproductive Endocrinology (3 years)	4-7 years	American Board of Obstetrics and Gynecology (ABOG)
General Surgery	5 years	Vascular, Cardiothoracic, Pediatric Surgery (2-3 years)	5-8 years	American Board of Surgery (ABS)
Orthopedic Surgery	5 years	Hand Surgery, Sports Medicine (1-2 years)	5-7 years	American Board of Orthopaedic Surgery (ABOS)
Otolaryngology	5 years	Head & Neck Surgery, Facial Plastics (1-2 years)	5-7 years	American Board of Otolaryngology (ABOto)
Urology	5 years	Female Pelvic Medicine, Oncology (1-2 years)	5-7 years	American Board of Urology (ABU)
Neurological Surgery	7 years	Endovascular, Spine Surgery (1-2 years)	7-9 years	American Board of Neurological Surgery (ABNS)
Plastic Surgery	6 years	Craniofacial, Hand Surgery (1-2 years)	6-8 years	American Board of Plastic Surgery (ABPS)
Cardiothoracic Surgery	6-7 years	Transplant, Aortic Surgery (1 year)	6-8 years	American Board of Thoracic Surgery (ABTS)
Dermatology	4 years	Mohs Surgery, Pediatric Dermatology (1-2 years)	4-6 years	American Board of Dermatology (ABD)
Pathology	4 years	Forensic Pathology, Hematopathology (1-2 years)	4-6 years	American Board of Pathology (ABPath)
Radiology	5 years	Interventional Radiology, Neuroradiology (1-2 years)	5-7 years	American Board of Radiology (ABR)
Psychiatry	4 years	Child & Adolescent, Forensic Psychiatry (1-2 years)	4-6 years	American Board of Psychiatry and Neurology (ABPN)
Physical Medicine & Rehabilitation	4 years	Spinal Cord Injury, Pain Medicine (1-2 years)	4-6 years	American Board of Physical Medicine and Rehabilitation (ABPMR)

How Does Residency Work After Medical School?

Medical residency begins immediately after medical school graduation, typically on July 1st each year. The first year of residency is called the intern year (PGY-1), during which physicians practice under direct supervision while holding a limited medical license. According to the ACGME’s 2025 Common Program Requirements, residents progress through increasing levels of independence across their training years. The ACGME mandates specific minimum training durations for each specialty, with program directors evaluating residents against defined milestones. The American Board of Medical Specialties (ABMS) requires completion of an ACGME-accredited residency before physicians can sit for board certification examinations. The Federation of State Medical Boards (FSMB, 2025) reports that residents must pass the USMLE Step 3 examination, typically taken during PGY-1 or PGY-2, to obtain an unrestricted medical license.

What Is the Difference Between Residency and Fellowship?

Residency is the initial period of specialized training after medical school that prepares physicians for independent practice in a specific field. Fellowship is optional advanced training after residency that provides subspecialty expertise. According to the American Medical Association’s 2025 Physician Practice Benchmark Survey, approximately 35% of physicians complete fellowship training. For example, an internal medicine residency lasts 3 years, but a cardiology fellowship adds 3 more years, making total training 6 years. The ACGME accredits both residency and fellowship programs, with over 1,200 fellowship programs available across 80+ subspecialties. The American College of Physicians (ACP, 2025) notes that fellowship training is increasingly common in internal medicine subspecialties, with cardiology, gastroenterology, and oncology being the most pursued.

What Is the Shortest Medical Residency?

The shortest ACGME-accredited residencies are in primary care fields: family medicine, internal medicine, and pediatrics, each requiring 3 years. Some transitional year programs (PGY-1 only) exist but are not standalone residencies — they serve as preliminary years before entering advanced specialty training. According to the NRMP’s 2025 Match data, family medicine had 4,892 positions filled, making it the largest single specialty by match volume. The American Academy of Family Physicians (AAFP, 2025) reports that family medicine residents complete training in 36 months, with rotations in adult medicine, pediatrics, obstetrics, surgery, and psychiatry. The American Board of Internal Medicine (ABIM, 2025) requires 36 months of training with specific requirements in ambulatory care, hospital medicine, and subspecialty rotations. The American Board of Pediatrics (ABP, 2025) similarly mandates 36 months of accredited training for general pediatrics certification.

What Is the Longest Medical Residency?

The longest residencies are in neurosurgery (7 years), cardiothoracic surgery (6-7 years), and plastic surgery (6 years). According to the Society of Neurological Surgeons’ 2025 training guidelines, neurosurgery residency includes 7 years of clinical training with rotations in neuro-oncology, vascular neurosurgery, spine surgery, and pediatric neurosurgery. The American Board of Neurological Surgery (ABNS, 2025) requires completion of a 7-year ACGME-accredited residency before board eligibility. Cardiothoracic surgery residency, according to the Thoracic Surgery Directors Association (TSDA, 2025), requires 6-7 years depending on the integrated or traditional pathway chosen. The American Board of Plastic Surgery (ABPS, 2025) mandates 6 years of training, including 3 years of general surgery prerequisites and 3 years of dedicated plastic surgery training.

How Does Residency Length Affect Physician Career Planning?

Residency length directly impacts physician career timelines, earning potential, and subspecialty options. According to the Association of American Medical Colleges (AAMC, 2025), the average medical school graduate carries $202,000 in educational debt. Longer residencies delay full attending-level salaries, which average $350,000 for surgical specialties versus $250,000 for primary care, according to Medscape’s 2025 Physician Compensation Report. The AAMC’s 2025 Physician Workforce Projections indicate that the United States will face a shortage of up to 86,000 physicians by 2036, with primary care shortages being most acute. The American College of Physicians (ACP, 2025) recommends that medical students consider both personal and financial factors when choosing specialties with different training durations. The American Medical Association’s 2025 report on physician burnout notes that residency length correlates with cumulative stress, with surgical residents reporting higher burnout rates during extended training periods.

What Factors Determine Residency Length?

The ACGME determines residency length based on the complexity of the specialty, the volume of clinical experience required, and the specific competencies residents must demonstrate. According to the ACGME’s 2025 Program Requirements, each specialty has defined milestones that residents must achieve before graduation. Surgical specialties require more years because of the technical skills and case volume needed. The American Board of Surgery (ABS, 2025) requires general surgery residents to complete a minimum of 750 operative cases across defined categories. The American Board of Internal Medicine (ABIM, 2025) requires 36 months of training with specific requirements in ambulatory care, hospital medicine, and subspecialty rotations. The American Board of Family Medicine (ABFM, 2025) mandates 1,650 patient encounters during residency, with at least 250 in each core area.

How Has Residency Length Changed Over Time?

Residency lengths have remained relatively stable over the past two decades, but the structure of training has evolved significantly. According to the ACGME’s 2025 historical review, the most notable change was the implementation of the 2011 duty hour restrictions, which limited residents to 80-hour work weeks and 24-hour maximum shifts. The American Medical Association’s 2025 report on graduate medical education notes that some specialties have introduced integrated pathways — for example, the 6-year integrated cardiothoracic surgery pathway that bypasses the traditional 5-year general surgery residency plus 2-3 year fellowship model. The American Board of Surgery (ABS, 2025) now offers an early specialization program (ESP) that allows residents to begin subspecialty training during their final year of general surgery. The Society of Thoracic Surgeons (STS, 2025) reports that integrated cardiothoracic surgery programs have grown from 5 programs in 2010 to 28 programs in 2025.

What Is the Match Process and How Does It Affect Residency Length?

The National Resident Matching Program (NRMP) conducts the Main Residency Match annually, matching medical school graduates to residency positions. According to the NRMP’s 2025 Match report, 42,952 applicants competed for 38,984 positions, with a match rate of 90.8% for US MD seniors. The match determines not only which specialty a physician enters but also the specific program where they will train. The American Medical Association (AMA, 2025) notes that some specialties offer combined residency programs — for example, internal medicine-pediatrics (med-peds) requires 4 years, while internal medicine-psychiatry requires 5 years. The ACGME accredits these combined programs under specific program requirements that ensure residents meet board eligibility for both specialties.

How Does International Medical Graduate (IMG) Residency Differ?

International medical graduates (IMGs) face additional requirements before entering US residency programs. According to the Educational Commission for Foreign Medical Graduates (ECFMG, 2025), IMGs must pass USMLE Step 1 and Step 2 CK, obtain ECFMG certification, and complete a clinical skills assessment. The NRMP’s 2025 Match report shows that 6,432 IMGs matched into US residency positions, representing 16.5% of all filled positions. IMGs often pursue preliminary or transitional year programs before entering advanced specialty training. The American Medical Association (AMA, 2025) reports that IMGs are more likely to enter primary care specialties, with 38% of IMG matches going to internal medicine, compared to 22% for US MD seniors.

What Are the Financial Implications of Residency Length?

Residency length directly affects physician financial planning and debt repayment timelines. According to the AAMC’s 2025 Debt Fact Card, the median medical school debt is $202,000, with 73% of graduates carrying educational debt. Resident salaries average $67,000 in PGY-1 and increase to approximately $82,000 by PGY-7, according to the ACGME’s 2025 Resident/Fellow Salary Survey. The American Medical Association’s 2025 report on physician financial health notes that longer residencies delay loan repayment and retirement savings by 2-4 years compared to shorter residencies. Medscape’s 2025 Physician Compensation Report confirms that surgical specialists earn approximately $100,000 more annually than primary care physicians, partially offsetting the financial impact of longer training.

How Does Residency Length Compare Internationally?

US residency programs are generally longer than training programs in other developed countries. According to the World Health Organization’s 2025 Global Health Workforce Report, the United Kingdom requires 2 years of foundation training plus 3-8 years of specialty training, totaling 5-10 years after medical school. Canada’s Royal College of Physicians and Surgeons (RCPSC, 2025) requires 2-5 years of residency, with most specialties being 4-5 years. The Australian Medical Council (AMC, 2025) mandates 1-2 years of internship plus 3-7 years of vocational training. The American Medical Association (AMA, 2025) notes that US training is among the longest globally, partly due to the ACGME’s rigorous competency-based requirements and the volume of clinical experience mandated by specialty boards.