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

Oluwaseyi Olumide Ajayi, MD

Individual provider Internal Medicine Physician · NPI 1871741108

Oluwaseyi Olumide Ajayi, MD is an Internal Medicine in Fairfax, Virginia. Qualified in 2002, 24 years ago. Practices with Fair Oaks Hospitalist Physicians, PLLC, a 61-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Pennsylvania and Virginia.

Years since qualifying
24
Licensed in
PA, VA
In the registry since
2008
Specialties on file
3
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

3580 Joseph Siewick Dr Ste 306
Fairfax, VA 22033-1764
Phone: (703) 391-4520
Fax: (703) 391-4521
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 7600 Central Ave, Philadelphia, PA 19111-2442 — (215) 728-2000

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 0101261196 (VA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD-440659 (PA)
Hospitalist Physician Taxonomy 208M00000X · Licence 0101261196 (VA)

Record details

NPI number1871741108
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 28, 2008
Last updated in NPPESSeptember 27, 2022
Certification dateSeptember 27, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2002 (24 years in practice)
Group practice Fair Oaks Hospitalist Physicians, Pllc — 61 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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