About
Han-Jong (John) Koh, MD brings a distinctive academic path to internal medicine. He earned a Bachelor of Science in Chemical Engineering from the Massachusetts Institute of Technology in 1985. He then completed his Doctorate of Medicine at the Medical College of Wisconsin in Milwaukee in 1990. His postgraduate training took place at Dartmouth-Hitchcock Medical Center in Lebanon, New Hampshire, where he completed both his internship and his internal medicine residency. He went on to serve as Chief Medical Resident at Dartmouth-Hitchcock and at the Veteran's Administration Medical Center in White River Junction, Vermont.
Dr. Koh holds board certification from the American Board of Internal Medicine. Washington Checkbook Consumers has recognized him as a Top Doctor every year since 2006. He maintains a hospital affiliation with INOVA Loudoun Hospital in Northern Virginia. His clinical focus centers on preventive care and managing chronic conditions such as type 2 diabetes, high cholesterol, and hypertension. He personally partners with each patient to anticipate healthcare needs before problems escalate. Outside of medicine, Dr. Koh enjoys hiking, skiing, golf, and travel.
Education & Training
Undergraduate
Massachusetts Institute of Technology, Cambridge, MA – Bachelor of Science, Chemical Engineering 1985
Medical School
Medical College of Wisconsin, Milwaukee, WI – Doctorate of Medicine 1990
Residency
Internal Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH (1991-1993); Chief Medical Resident, Dartmouth-Hitchcock Medical Center and Veteran's Administration Medical Center, White River Junction, VT (1993-1994)
Additional Training
Internship: Internal Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, NH (1990-1991)
Certifications
Conditions Treated
Who is Dr. Koh right for?
Dr. Koh is a strong fit for adults seeking a long-term, relationship-driven approach to internal medicine. Patients managing chronic conditions like type 2 diabetes, high cholesterol, or hypertension benefit from his proactive, prevention-focused care. He works well with patients who value direct, consistent access to their physician rather than rotating providers. Those who travel frequently also benefit from his ability to coordinate care remotely and assist with urgent medical needs on the road.
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Frequently Asked Questions
Dr. Koh specializes in internal medicine with a strong focus on chronic disease management. He regularly treats patients with type 2 diabetes, high cholesterol, and hypertension. His approach emphasizes anticipating health needs early and building a preventive care plan tailored to each patient.
Yes, Dr. Koh holds board certification from the American Board of Internal Medicine. He earned his medical degree from the Medical College of Wisconsin and completed his residency training at Dartmouth-Hitchcock Medical Center in New Hampshire.
Dr. Koh completed his internship and internal medicine residency at Dartmouth-Hitchcock Medical Center in Lebanon, New Hampshire. He then served as Chief Medical Resident at Dartmouth-Hitchcock and at the Veteran's Administration Medical Center in White River Junction, Vermont. Before medical school, he studied Chemical Engineering at MIT.
Yes. Dr. Koh is reachable by phone after hours and on weekends. Members contact him directly for urgent concerns outside of regular office hours. This direct access is a core part of his MDVIP practice.
Yes. Dr. Koh sees every patient personally during office visits. He does not hand off care to nurse practitioners or physician assistants. This consistency supports the long-term doctor-patient relationship he prioritizes.
Yes. Washington Checkbook Consumers has named Dr. Koh a Top Doctor every year since 2006. This recognition reflects his sustained reputation for high-quality patient care in the Leesburg, Virginia area.
Dr. Koh focuses on managing and anticipating each patient's individual healthcare needs. He works collaboratively with patients to build personalized wellness plans. His goal is to keep patients on a proactive path to health rather than addressing concerns only after they become problems.
Yes. Dr. Koh helps coordinate care for members who need medical attention while away from home. He can assist with connecting patients to local hospitals, pharmacies, or physicians during travel. Members have also received prescription assistance remotely when needed.
Doctor profile last updated June 6, 2026