About
Dr. Gwilym Parry earned his BS in Psychology from the University of Denver before completing his MD at the University of Colorado School of Medicine in 1981. His internship took him through Georgetown Medical Service and DC General Hospital. He then served as Chief Resident of Internal Medicine at Baystate Medical Center, a Tufts University affiliate, from 1983 to 1986. He has held membership in the American Board of Internal Medicine since 1987.
Dr. Parry founded Medical Associates of Reston that same year and has practiced in the Reston community ever since. Washingtonian Magazine has recognized him multiple times with its Top Doctors distinction. Patients describe him as thorough, warm, and genuinely responsive, qualities that have kept many of them under his care for 20 to 35 years. He is passionate about early detection and preventive medicine. His thoroughness has made a measurable difference in patient outcomes, including catching serious diagnoses early. He later joined forces with SignatureMD to offer his Personalized Care Program, deepening the access and continuity he provides to every member.
Education & Training
Undergraduate
University of Denver, BS in Psychology
Medical School
University of Colorado School of Medicine, MD (1981)
Residency
Chief Resident of Internal Medicine, Baystate Medical Center (Tufts University), 1983-1986
Additional Training
Internship at Georgetown Medical Service and DC General Hospital
Certifications
Conditions Treated
Who is Dr. Parry right for?
Dr. Parry is a strong fit for adults who want a primary care physician they can count on for the long term. Patients managing chronic conditions such as diabetes, hypertension, or heart disease benefit from his thorough, prevention-focused approach. He works well with patients who value direct access and unhurried appointments. Adults seeking early detection and proactive health management will find his clinical style particularly well matched to their goals.
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Frequently Asked Questions
Dr. Parry focuses on internal medicine and primary care for adults. He manages chronic conditions including diabetes, heart disease, high blood pressure, high cholesterol, lung disease, and sleep disorders. He also handles respiratory illness, joint conditions, and coordinates specialist referrals when needed.
Dr. Parry has practiced internal medicine for more than four decades. He completed his MD in 1981 and founded Medical Associates of Reston in 1987. Many of his patients have been under his care for 20 to 35 years.
Yes. Dr. Parry has held membership in the American Board of Internal Medicine since 1987. He earned his MD from the University of Colorado School of Medicine and completed his residency training as Chief Resident at Baystate Medical Center, a Tufts University affiliate.
Dr. Parry earned his MD from the University of Colorado School of Medicine in 1981. He completed his internship through Georgetown Medical Service and DC General Hospital. He then served as Chief Resident of Internal Medicine at Baystate Medical Center from 1983 to 1986.
Yes. Washingtonian Magazine has recognized Dr. Parry multiple times with its Top Doctors distinction. Patients consistently describe him as thorough, warm, and genuinely responsive.
Dr. Parry is passionate about early detection and preventive medicine. He believes catching problems before they progress leads to measurably better outcomes for patients. His thoroughness and attention to detail have helped patients identify serious diagnoses at earlier, more treatable stages.
Yes. Dr. Parry makes himself available to members around the clock by phone, email, or text. That direct access is a core part of the Personalized Care Program he runs through Medical Associates of Reston.
Dr. Parry sees adult patients across a wide range of health needs. He works with patients managing chronic diseases, those focused on preventive care, and adults who want a primary care physician with deep continuity of care. His long-tenured patient relationships reflect the trust he builds over time.
Doctor profile last updated March 21, 2026