Becoming a cardiologist takes a minimum of six years of training after medical school, and often seven or more. That breaks down into three years of internal medicine residency followed by a three-year cardiology fellowship. If you pursue a subspecialty like interventional cardiology or electrophysiology, add one to two more years on top of that, bringing the total to eight years or longer after earning your medical degree.
Internal Medicine Residency: The First Three Years
Every aspiring cardiologist starts with a three-year internal medicine residency. This is where you build a broad foundation in diagnosing and managing diseases across all organ systems. You’ll rotate through hospital wards, intensive care units, outpatient clinics, and emergency departments. By the end, you’re eligible for board certification in internal medicine, which is a prerequisite before you can sit for cardiology boards.
There is a research-oriented pathway through the American Board of Internal Medicine that allows some trainees to shorten their clinical internal medicine training to 24 months (with at least 20 of those in direct patient care). This track is designed for physician-scientists and requires early planning, ideally during your first year of residency. Your total clinical training still needs to equal what’s required in the standard route, so it’s less of a shortcut and more of a restructuring that weaves research in earlier.
General Cardiology Fellowship: Three More Years
The cardiology fellowship itself is 36 months, as required by the Accreditation Council for Graduate Medical Education (ACGME). At least 24 of those months are clinical, and the program mandates specific minimum exposures: three months in the cardiac catheterization lab, six months in noninvasive cardiac evaluation (think echocardiography and stress testing), two months in electrophysiology, and nine months of non-laboratory clinical work like outpatient cardiology clinics and inpatient consult services.
The remaining time is typically used for research, electives, or deeper clinical training in areas of interest. While the ACGME doesn’t mandate a specific number of research months, most fellowship programs expect fellows to produce scholarly work and many build dedicated research blocks into the schedule.
To become board-certified in cardiovascular disease, you must complete this 36-month fellowship at an accredited program, hold a valid medical license, already be board-certified in internal medicine, and pass the cardiovascular disease certification exam. The exam is offered once per year, and you must finish all required training, including vacation time, by October 31 of the year you sit for it.
Subspecialty Fellowships Add One to Two Years
Many cardiologists don’t stop after general fellowship. The field has several subspecialties, each requiring its own additional fellowship:
- Interventional cardiology: One year. Training focuses heavily on the catheterization lab, where you learn to open blocked arteries with stents, perform structural heart procedures, and manage acute cardiac emergencies. At programs like Mayo Clinic, fellows spend four days a week in the cath lab and the rest in outpatient clinics. A second year is available at some centers for advanced structural heart work.
- Clinical cardiac electrophysiology: Two years. This covers the diagnosis and treatment of heart rhythm disorders, including implanting pacemakers and defibrillators, performing catheter ablation procedures, and managing complex arrhythmias.
- Advanced heart failure and transplant cardiology: One year. Fellows train in managing patients with end-stage heart disease, mechanical circulatory support devices (like heart pumps), and heart transplantation.
- Advanced cardiovascular imaging: One year. This covers specialized techniques like cardiac CT and cardiac MRI, often with rotations split across multiple imaging modalities over 52 weeks.
If you pursue one of these, your total post-medical-school training ranges from seven to nine years. An interventional cardiologist, for example, completes three years of internal medicine, three years of cardiology fellowship, and one year of interventional training: seven years total. An electrophysiologist hits eight.
The Pediatric Cardiology Path
If your interest is in treating children, the route looks different. Instead of internal medicine, you complete a three-year pediatric residency, followed by a three-year pediatric cardiology fellowship. Mayo Clinic’s program, which is typical of the structure nationally, includes two years of intensive clinical training and one full year devoted to research, as required by the ACGME. The total is still six years after medical school at minimum, but the content and patient population are entirely different from the adult track.
What Fellows Earn During Training
Cardiology fellows are paid a stipend that increases modestly each year. At the University of Tennessee’s program, which publishes its pay scale, the 2026-2027 stipends give a sense of what to expect nationally. A first-year fellow (postgraduate year 4, since fellowship follows three years of residency) earns roughly $69,500 per year, or about $5,800 per month. By the third year of fellowship (PGY-6), that rises to around $75,000. A subspecialty fellow in a fourth year earns approximately $77,800.
These numbers are modest relative to the workload and the eventual earning potential of a practicing cardiologist, but they’re consistent with graduate medical education stipends across specialties. Programs also typically provide health insurance, disability and life insurance, and some educational funding.
The Full Timeline at a Glance
For someone entering medical school today, the path to practicing cardiology looks like this: four years of medical school, three years of internal medicine residency, three years of cardiology fellowship, and optionally one to two years of subspecialty training. That’s 10 to 12 years from the first day of medical school to independent practice. From the end of medical school alone, expect six years minimum for general cardiology and up to nine for the most training-intensive subspecialties. As one perspective published in the Journal of the American College of Cardiology put it, the “8 years or more after medical school to become a subspecialist in cardiovascular disease is indeed daunting.” It is a long road, but the training structure is well-defined, and each stage builds directly on the one before it.