Skip to main content

8110 Gatehouse Road, Falls Church, VA 22042

Mark Theiss, MD

A member of Inova Medical Group
The doctors of Inova Medical Group are Inova’s premier primary care and specialty physicians, offering top-notch medical expertise, full access to Inova facilities, and the convenience of integrated electronic medical records.
Mark Theiss, MD


Board-certified specialties granted by an ABMS Member Board. Learn more about board certification.
Orthopaedic Sports Medicine, Orthopaedic Surgery

Clinical Interest

Areas of special interest identified by the physician or additional training completed.
Hip Replacement, Joint Replacement Surgery, Knee Problems/Surgery and Treatments, Knee Replacement, Shoulder Problems/Surgery and Treatments

Years of Experience





Request Profile Update
Book an Appointment

About Mark Theiss, MD

Dr. Mark Theiss is a specialty care physician board certified in orthopaedic surgery and sports medicine. Dr. Theiss joins Inova Medical Group with over 30 years of clinical experience. He has a special interest in shoulder, knee, and hip replacement coupled with a passion for sports medicine. 

For the past 13 years to present, Dr. Theiss has served as a chairman of the Department of Orthopaedics at Inova Fairfax Hospital. He is also a clinical associate professor with the Department of Orthopaedic Surgery at Georgetown University Medical Center and at the VCU School of Medicine Inova Campus.

Dr. Theiss became interested in orthopaedic surgery when participating in sports during his youth. After witnessing sports injuries, he took a keen interest in the medical process and helping his teammates recover so they could return to sports. That passion continues today. He enjoys assisting patients of all ages with the return to an active lifestyle, regardless of athletic ability or age.

Dr. Theiss grew up in San Francisco and currently resides in Fairfax, VA, with his wife whom he coaches during marathon and duathlon training. He is an avid distance cyclist, skier and fisherman.


Medical Education

Georgetown University School of Medicine 1975


Saint Barnabas Medical Center
Training Specialty: General Surgery
07/01/1975 - 06/30/1976


MedStar Georgetown University Hospital
Training Specialty: Orthopaedic Surgery
07/01/1976 - 06/30/1980

Board Certification

Orthopaedic Sports Medicine, Orthopaedic Surgery

Hospital Affiliation

Patient Reviews

About Patient Comments

The Patient Rating score is an average of all responses to physician related questions on our nationally-recognized Press Ganey Patient Satisfaction Survey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are gathered from our Press Ganey Patient Satisfaction Survey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

Learn More

Inova Physician Referral Services

Please make note of the following information.

This referral service is sponsored by Inova. Only physicians with appropriate medical staff privileges at an Inova affiliated hospital may participate. There is no charge or fee to you or for the participating physician for our service. Physician participation is voluntary.

Physician referrals will be based on your referral needs and preferences of location, specialty, and rotation availability of the physician.

The physicians on our referral panel are independent practitioners or physician employees. The independent practitioners are not employees, agents or representatives of Inova and are solely responsible for their provision of medical care to you.