DCInternists - Your Personal Private Physician

our concierge model

Our concierge practice enrolls a limited number of patients, many of whom we’ve known for decades. By keeping our panels relatively small, we can provide longer visits, offer same or next day appointments and guarantee access to a physician on a 24/7 basis, through phone and email. We offer in-house lab and other diagnostic testing, with referrals to outside facilities when needed.

We are committed to providing you personalized attention and seamless experience with our team. When you call our office, you will always reach one of our team members, and not be put through a phone tree. Your requests will be handled quickly and efficiently. We will assist you with referrals both within and outside the DC area.

meet our providers

Mitchell Dunn, MD
General Internist

Beth Horowitz, MD
General Internist

Gregory Prokopowicz, MD, MPH
General Internist

Christina Russo, PA-C
Physician Assistant

Mitchell Dunn, MD

Board Certified General Internist

“I value the long-term relationships with patients that are a special part of practicing internal medicine. I am eager to learn more about new research and technology and incorporate the best into the care I provide.”

I have been active in the Washington DC medical community for 40 years. My extensive network of professional colleagues allows me to guide my patients to the right specialists in the metro area and beyond if necessary. I am dedicated to my patients and am interested in all that is happening in your lives and your families. I often see multiple family members and have patients who travel from outside the United States to meet with me for regular examinations.

I attended the Duke University School of Medicine and completed my residency at George Washington University. I served as Chief Medical Resident and spent several years as a member of the full time faculty before starting in private practice. I am a Diplomat of the American Board of Internal Medicine and have been listed as a Washingtonian Top Doctor in every medical issue over the past 20 years. My hobbies include personal fitness and working with computers and information technology. I am married to Susan Lacks, MD and we have three wonderful sons and are proud grandparents.

Beth Horowitz, MD

Board Certified General Internist

I received my BA from Stanford University. I am a graduate of the University of California San Francisco medical school and completed my internal medicine residency at the Mount Zion/UCSF program. I also have a masters in health and medical education from UC Berkeley. After moving back to the East Coast in 1987, I joined the faculty of George Washington University Medical Center, eventually becoming director of the medical residency program. While at GW, I developed courses and gave numerous presentations on issues related to women’s health.

I opened a private practice in 1996, but have maintained an academic appointment and have taught first and second year medical students over the years. I have worked with Peace Corps volunteers, am a Fellow of the American College of Physicians and an active member of Physicians for Human Rights. I enjoy treating patients at all stages of adulthood. I have a special interest in adolescents and often begin working with them when they first leave their pediatrician. To better understand the health problems facing people at the other end of life, I became board certified in geriatrics in the early 1990s.

I have been named a Washington magazine Top Doctor and listed in Best Doctors in America.

I live in Washington DC with my husband, Michael Kazin, who is a professor of US history at Georgetown University. We have 2 grown children and an unruly dog.

Gregory Prokopowicz, MD, MPH

Board Certified General Internist

“As a physician, my role is not just to diagnose and treat, but to help the patient understand medical concepts and to successfully navigate the medical system and coordinate their care with multiple specialists. It has never been more important to have a trustworthy interpreter of medical knowledge, and I strive to play that role through teaching and conversation with my patients.”

I received my BS in philosophy and psychology, MPH in epidemiology, and MD from the University of Michigan. I completed my residency in internal medicine at Johns Hopkins and joined the faculty, where I maintained a busy primary care practice for 25 years, taught generations of medical students and residents, and directed the Johns Hopkins Hypertension Center.

I am board certified in Internal Medicine and am a fellow of the American College of Physicians and the American Society of Hypertension. I am also a Diplomate of the American Board of Obesity Medicine. I was selected as a Top Doctor by Baltimore Magazine in 2020 and 2021.

I have particular expertise in the management of cardiovascular disease, diabetes, and obesity.

My wife, Kimberley, is also a physician, and I have two sons, Michael and Matthew. My interests include fitness, classical music, and current affairs.

Christina Russo, PA-C

Board Certified Physician Assistant

I am a graduate with a Master of Physician Studies from Albany Medical College and joined DC Internists in 2015. I work closely with our providers to enhance the delivery of high-quality health care and am available for same-day appointments. I maintain Board Certification through the National Commission on Certification of Physician Assistants. I live in Arlington, VA with my husband and daughter.

contact us

If you would like to become a patient in our concierge practice, schedule a meet and greet or request more details regarding our concierge services, please let us know and a concierge coordinator will reach out by phone.

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202.293.3636

our concierge model

meet our providers

Mitchell Dunn, MD General Internist

Beth Horowitz, MD General Internist

Gregory Prokopowicz, MD, MPH General Internist

Christina Russo, PA-C Physician Assistant

Mitchell Dunn, MD

Board Certified General Internist

Beth Horowitz, MD

Board Certified General Internist

Gregory Prokopowicz, MD, MPH

Board Certified General Internist

Christina Russo, PA-C

Board Certified Physician Assistant

contact us

payment portal

Mitchell Dunn, MD
General Internist

Beth Horowitz, MD
General Internist

Gregory Prokopowicz, MD, MPH
General Internist

Christina Russo, PA-C
Physician Assistant