Family Medicine in Falls Church, PC

Family Medicine in Falls Church is the practice of Dr. Gordon Theisz and Dr. Arminda Nasuti. Both doctors are board certified in Family Medicine. "Family doctors" have a three year residency program where they learn broad aspects of medicine. Training includes pediatric and adult medicine, minor surgeries, public health issues, and mental health. Thus, our specialty embraces all ages, sexes, races, and medical issues. We utilize our specialist partners, when needed, to assist us in the care of our patients or for procedures that can not be accomplished in our office.

Our office is set up to be "paperless." We utilize a medical management program known as e-MDs. The program, which features an electronic medical record allows us to document your visit quickly and accurately, track needed or recommended tests and procedures, and manage your health more effectively and efficiently. Billing is accomplished electronically in most cases with the system.

As an established patient, when you contact our office, you should be able to get an appointment on the same or next day for most acute issues. New patients should call to inquire about appointment availability. Physicals and chronic problem follow-up appointments are generally scheduled in advance but often can be scheduled on the same day. For new patients, we prefer to complete physicals after an initial get-to-know office visit. This initial visit will allow the doctors to review health history and address acute concerns.

PCMH Provider

Gordon Theisz, MD, FAAFP


I started Family Medicine in Falls Church, PC with the idea of living and working in the same town so that I could provide care for neighbors, friends, and townspeople. I have resided in Falls Church City since 2001, but also lived in the region in the 1990s. I graduated from the University of Virginia School of Medicine in 1998. I completed my residency at Riverside Family Medicine Residency in Newport News, VA, where fellow residents voted me as the recipient of the G. Stanley Mitchell Spirit of Family Practice Award in 2001. I then worked for a family practice in western Fairfax County for four years before starting my own private practice.


Prior to entering medicine, I earned a Bachelor of Science, Summa Cum Laude, in Biology from Old Dominion University. I served in the Navy as a line officer aboard USS Thach (FFG-43) stationed in San Diego, CA and later in Yokosuka, Japan. I was awarded two Navy Achievement medals during my service. After the Navy, I worked for a local technology consulting firm, Technology Catalysts International Corporation, in Falls Church. I grew up in Severna Park, Maryland, near Annapolis. At Severna Park High School, I was a marching band member and as a Boy Scout achieved the rank of Eagle Scout.

I am married to Melissa, and have three children Alex, Delaney, and Ciara. The children attend Falls Church City Schools. I am also a member of Falls Church Presbyterian Church, and I am the Chartered Organization Representative for Boy Scout Troop 895 in Falls Church. I am also, along with my wife, very active in local community issues. I have served on the board for the Village Preservation and Improvement Society (VPIS) and the executive committee of the Citizens for a Better City (CBC). Melissa is a girl scout leader, board member of VPIS, and serves on the Planning Commission for the City of Falls Church.

PCMH Provider

Arminda Nasuti, MD


I joined Family Medicine in Falls Church in 2017 after our family moved from Sauk City, Wisconsin where I was a practicing family doctor for five years.  I graduated from Wake Forest University School of Medicine in 2007. At Wake Forest, I was elected to the Gold Humanism Honor Society for exemplary service to others, clinical excellence, integrity, and compassionate and respectful relationships with patients, families, and colleagues. I was also the recipient of the Robert P. Vidinghoff Memorial award. I completed my residency at the University of Wisconsin School of Medicine and Public Health in Madison, WI.  I also have a Masters of Science from The College of William & Mary Virginia Institute of Marine Science, and a Bachelors Degree in English and Biology from Williams College in Massachusetts. 


In addition to my studies, I also worked as a Congressional Fellow with the U.S. House of Representatives for the Subcommittee on Fisheries, Oceans, and Wildlife.  My husband Peter and my daughter Claire live in North Arlington, but we love visiting the City of Falls Church's library, farmer's market and other community attractions.