Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark M Theiss, MD

Individual provider Orthopaedic Surgery Physician · NPI 1669534350

Dr. Mark M Theiss, MD is a Sports Medicine in Falls Church, Virginia. Graduated from Georgetown University School of Medicine in 1975, 51 years ago. Practices with Inova Health Care Services, a 1,827-clinician group and accepts Medicare assignment. Licensed in Virginia.

Years since qualifying
51
Trained at
Georgetown University School of Medicine
Licensed in
VA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

3300 Gallows Rd
Falls Church, VA 22042-3300
Phone: (703) 776-4001
Fax: (703) 776-7113
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Sports Medicine (Orthopaedic Surgery) Physician (primary) Taxonomy 207XX0005X · Licence 0101036798 (VA)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence 0101036798 (VA)

Record details

NPI number1669534350
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 16, 2006
Last updated in NPPESJanuary 29, 2022
Certification dateJanuary 29, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtySPORTS MEDICINE
Also practisesORTHOPEDIC SURGERY
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1975 (51 years in practice)
Group practice Inova Health Care Services — 1827 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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