Internists are the adult medicine specialists, and the field is the gateway to more subspecialties than any other. General internists manage complex, multi-system illness in patients who often have five diagnoses at once. Roughly half of internal medicine residents go on to fellowship, into cardiology, gastroenterology, oncology, critical care and the rest.
This guide covers careers in internal medicine end to end, walking through all twenty accredited subspecialties, the years of training each one costs you, what the work earns and how competitive the path is.
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Internal Medicine opens onto twenty subspecialties. See the eleven-year path to it, and what the year you are in has to produce.
Every stage from first semester to practising, how long each specialty takes, and what to do in the year you are in now.
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Medical careers in internal medicine
Every path below is a formal, ACGME-accredited subspecialty you enter through a fellowship after internal medicine residency. Together they hold 15,679 physicians in training.
Scroll the table sideways to see every column.
| Career | What the work is | In training |
|---|---|---|
| Cardiovascular disease | Diagnoses and treats heart and vascular disease, and is the largest fellowship in medicine. | 3,762 |
| Pulmonary disease and critical care medicine | Combines lung medicine with intensive care, and is the most common route into the ICU. | 2,445 |
| Hematology and medical oncology | Treats cancer and blood disorders, and gives the chemotherapy and immunotherapy. | 2,303 |
| Gastroenterology | Treats digestive and liver disease, and performs endoscopy. | 2,152 |
| Nephrology | Treats kidney disease, runs dialysis and cares for transplant recipients. | 887 |
| Infectious disease | Diagnoses and treats infection, and runs antimicrobial stewardship and HIV care. | 814 |
| Endocrinology, diabetes, and metabolism | Treats diabetes, thyroid and other hormonal disease. | 773 |
| Rheumatology | Treats autoimmune and inflammatory disease of the joints and connective tissue. | 591 |
| Critical care medicine | Runs the intensive care unit for patients with organ failure. | 388 |
| Interventional cardiology | Opens blocked coronary arteries and treats structural heart disease through catheters. | 365 |
| Clinical cardiac electrophysiology | Diagnoses and ablates heart rhythm disorders, and implants pacemakers and defibrillators. | 350 |
| Geriatric medicine | Cares for older adults, with an eye on function, frailty and the medication list. | 264 |
| Sleep medicine | Diagnoses and treats sleep apnoea, insomnia and other sleep disorders. Physicians from several specialties can enter it. | 239 |
| Advanced heart failure and transplant cardiology | Manages end-stage heart failure, mechanical support and transplant. | 92 |
| Clinical informatics | Builds and improves the health record and data systems clinicians use. | 79 |
| Pulmonary disease | Treats lung disease, from asthma and COPD through to interstitial disease. | 62 |
| Transplant hepatology | Cares for advanced liver disease and manages patients through transplant. | 43 |
| Interventional pulmonology | Diagnoses and treats airway and pleural disease through the bronchoscope. | 34 |
| Adult congenital heart disease | Cares for adults who were born with heart defects and have outlived the paediatric services. | 31 |
| Medical oncology | Treats cancer with drug therapy. | 5 |
Physicians in training as of the 2024-2025 academic year, from the ACGME Data Resource Book. A larger number means a larger field, not an easier one.
Our full guides go deeper on several of these roles, covering gastroenterologist, endocrinologist.
How long does internal medicine training take?
All of the careers in internal medicine on this page run through the same first eight years, and separate afterwards. Residency length is taken from the ACGME Data Resource Book for the 2024-2025 academic year.
- Bachelor's degree, four years. Any major works, as long as you finish the medical school prerequisites and sit the MCAT.
- Medical school, four years. Two years mostly preclinical, two years mostly in the hospital, with USMLE Step 1 and Step 2 along the way.
- Internal Medicine residency, three years. Three years of residency after medical school, then optional fellowship of two to three years.
- Fellowship, one to three years. Optional, and the route into the subspecialties listed below.
That is eleven years from starting your bachelor's degree to practising independently, before any fellowship. How long medical school takes covers the middle four in detail.
How much do internists earn?
The Bureau of Labor Statistics puts the median wage for general internal medicine physicians at $256,560 a year in 2025, across 67,150 people in the occupation.
| Point | A year | What it means |
|---|---|---|
| Median | $256,560 | half earn more, half earn less |
| 10th percentile | $73,570 | the lower end, often early career or part time |
| 90th percentile | $475,430 | the upper end |
Figures from the BLS Occupational Employment and Wage Statistics, national estimates, 2025. Wages at the top of the scale are reported as equal to or greater than $239,200 in some categories, so a published median can sit below what practising physicians in the field report.
Earnings across careers in internal medicine swing more on setting and geography than on the specialty itself. Academic posts sit below private practice, and rural positions often sit above urban ones for the same work.
How competitive is internal medicine?
Almost every position offered was filled. A low share filled by US MD seniors means the specialty draws heavily on DO and international graduates, so a strong application from any route stands a chance.
| Measure | 2026 | What it counts |
|---|---|---|
| Positions filled | 95.2% | of all positions the specialty offered |
| Filled by US MD seniors | 35.7% | the rest went to DO, international and previous graduates |
Figures from NRMP Results and Data, 2026 Main Residency Match, Table 1A.
Match rates describe the field, not your application. What moves your own odds is your Step 2 score, your clinical grades, your letters and your research, and the odds of getting into medical school covers the stage before any of that.
How careers in internal medicine compare with the other specialties
Training length. Internal Medicine residency runs three years. Of the nineteen specialties on this site, three are shorter and six are the same length. The spread across all of them is two years to five.
Earnings. At $256,560, it ranks 10 of 13 on median wage among the specialties here with their own BLS occupation code. The highest is diagnostic radiology at $420,860.
Competition. Twelve of the fifteen specialties here that run through the main match fill a higher share of their positions with US MD seniors, which is the closest single proxy for how contested a field is.
Size of the field. BLS counts 67,150 people employed in the general internal medicine physicians category. A larger field means more posts advertised and more geographic choice about where you practise.
None of these numbers should pick a specialty for you. They are the constraints you are choosing inside, and the choice itself comes down to whether the day-to-day work holds your attention for thirty years.
Skills and requirements for internal medicine
Where the work happens. Hospital wards and outpatient clinic, split differently depending on whether you practise as a hospitalist, an outpatient internist or a subspecialist.
Who it suits. People who like reasoning through a problem, who are comfortable with ambiguity and comorbidity, and who want to keep the widest possible range of doors open after residency.
How you get in. Three years of residency after medical school, then optional fellowship of two to three years.
Before any of that, the requirements match every other route into medicine. You need a bachelor's degree, the prerequisite coursework, clinical and research experience, an MCAT score, and a complete medical school application.
Common questions about careers in internal medicine
Should you do internal medicine if you want a subspecialty?
It is the standard route to twenty ACGME-accredited subspecialties, more than any other residency offers. You do have to be willing to practise general internal medicine for three years first.
How long do careers in internal medicine take to train for?
Eleven years after you start your bachelor's degree. Four of undergraduate study, four of medical school and three of postgraduate training. Fellowship adds one to three more.
What are the subspecialties of internal medicine?
ACGME accredits twenty. The largest by number of physicians in training is cardiovascular disease, with 3,762. The table above lists all of them.
What is the average salary in internal medicine?
BLS reports a median of $256,560 a year for general internal medicine physicians in 2025, with the tenth percentile at $73,570. Subspecialty and setting move that figure more than anything else.
Careers in the other specialties
Every specialty on the same figures, so you can compare training length, earnings and match competitiveness side by side. allergy and immunology, anesthesiology, dermatology, diagnostic radiology, emergency medicine, family medicine, medical genetics, neurology, nuclear medicine, obstetrics and gynecology, ophthalmology, pathology, pediatrics, physical medicine and rehabilitation, preventive medicine, psychiatry, surgery, urology.
Final thoughts on careers in internal medicine
People who like reasoning through a problem, who are comfortable with ambiguity and comorbidity, and who want to keep the widest possible range of doors open after residency. tend to do well here, and the honest test of fit is whether the day-to-day appeals to you rather than whether the specialty is prestigious. You do not have to decide now. Almost nobody commits before their third-year clerkships, and plenty change their minds during residency.
What you can do now is keep the door open, and that comes down to your MCAT score and your application. Every route on this page starts in the same place.
- Studying for the MCAT now? The live MCAT course runs one cohort at a time with 515+ scorers teaching it.
- Want one-on-one help? MCAT tutoring pairs you with a mentor who scored in the range you are aiming at.
- Building an application rather than a score? Medical school admissions coaching covers the school list, the essays and the interviews.
- Wondering where to apply? The medical school hub lists every state and province with a program, and the specialty rankings cover which schools are strongest in each field.
- Just browsing? The free MCAT resources are a good place to start, and student score stories show what the jumps look like.
- Every accredited residency program in the country is searchable in ACGME's public directory.
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