Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John T O'Brien, MD

Individual provider Cardiovascular Disease Physician · NPI 1952392482

John T O'Brien, MD is registered under Cardiovascular Disease (Cardiology) in Falls Church, Virginia. Graduated from Georgetown University School of Medicine in 1977, 49 years ago. Practices with Inova Health Care Services, a 1,827-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Virginia.

Years since qualifying
49
Trained at
Georgetown University School of Medicine
Licensed in
VA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3300 Gallows Rd
Falls Church, VA 22042-3307
Phone: (703) 776-4001
Fax: (703) 776-7113
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3299 Woodburn Rd, Annandale, VA 22003-1275 — (703) 573-0740

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence 0101036720 (VA)

Record details

NPI number1952392482
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 3, 2005
Last updated in NPPESJanuary 5, 2022
Certification dateJanuary 5, 2022

Medicare enrollment

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

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesINTERNAL MEDICINE
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1977 (49 years in practice)
Group practice Inova Health Care Services — 1827 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients2,006
Services billed 3,270 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Inova Health Care Services

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1827 clinicians in the practice; 12 are shown here.

Other providers in Falls Church