Oluwaseyi Olumide Ajayi, M.D.
Internal Medicine Physician · Fairfax, VA
Oluwaseyi Olumide Ajayi, M.D. is an internal medicine physician with a practice address in Fairfax, Virginia, and NPI 1871741108, issued on Aug 28, 2008. Check the license (Virginia 0101261196, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Oluwaseyi Olumide Ajayi
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 0101261196 VA
MD-440659 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3580 Joseph Siewick Dr Ste 306, Fairfax, VA 22033
- Phone
- (703) 391-4520
- Enumerated
- Aug 28, 2008
- Record last updated
- Sep 27, 2022
- Fax
- (703) 391-4521
- Medicaid ID
- 102547276 PA
- Medicare enrollment
- Enrolled (PECOS I20150212001742); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,599 in Virginia → Look up another NPI →
Also registered at 3580 Joseph Siewick Dr Ste 306
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sheila Hautbois, PA-CPhysician Assistant1609376086
- Sandy Ibrahim, MDFamily Medicine Physician1437299658
- Michael KimInternal Medicine Physician1235495219
- Tucker Landry, LCSWClinical Social Worker1700364585
- Brian Masterson, MD, MPHPsychiatry Physician1225062383
- Sara Williams, M.D.Internal Medicine Physician1730509720
Verify Oluwaseyi Olumide Ajayi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101261196Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
370 Medicare Part D claims for 123 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Eliquis42 claims
- Pantoprazole Sodium16 claims
- Cefuroxime15 claims
- Prednisone15 claims
- Amlodipine Besylate14 claims
- Furosemide14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Fair Oaks Hospitalist Physicians, PLLCFairfax, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Oluwaseyi Olumide Ajayi among 3,599 internal medicine physician records in Virginia
Oluwaseyi Olumide Ajayi, M.D. is one of 3,599 internal medicine physician records with a practice address in Virginia. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 55% of them.
- NPI issued2008 · 55% of these records are older, 40% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2002 · median 2003 among the 2,234 with a school on file
- Record last updated2022 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
108 internal medicine physician records list a practice address in Fairfax
They are 108 of the 6,584 NPPES records with a practice address in Fairfax, and 3,599 internal medicine physician records in Virginia.
All 3,599 in Virginia → Every provider in Fairfax → Internal Medicine Physician nationwide →
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Common questions
What is Oluwaseyi Olumide Ajayi, M.D.'s NPI number?
Oluwaseyi Olumide Ajayi, M.D.'s National Provider Identifier (NPI) is 1871741108, issued on Aug 28, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Oluwaseyi Olumide Ajayi, M.D. located?
The NPPES record lists a practice address at 3580 Joseph Siewick Dr Ste 306, Fairfax, VA, 22033. Phone: (703) 391-4520. Providers update this record themselves, so call before visiting.
How can I verify Oluwaseyi Olumide Ajayi, M.D.'s license?
NPPES lists Virginia license number 0101261196, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Oluwaseyi Olumide Ajayi, M.D. prescribe under Medicare Part D?
In 2024, Oluwaseyi Olumide Ajayi, M.D. had 370 Medicare Part D claims for 123 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.