Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Oluwaseyi Olumide Ajayi, M.D.

Internal Medicine Physician in Fairfax, VA · enumerated 2008.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1871741108

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Registry record

Entity type Individual (Type 1)

Name Oluwaseyi Olumide Ajayi

Credential M.D.

Sex Male

Practice address 3580 Joseph Siewick Dr Ste 306, Fairfax, VA, 22033

Phone (703) 391-4520

Fax (703) 391-4521

Enumeration date Aug 28, 2008

Last updated in NPPES Sep 27, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD-440659 (PA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 0101261196 (VA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 0101261196 (VA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
102547276	Medicaid	PA	-
597586	Other	PA	MEDICARE TPI GROUP
CD4829	Other	PA	RAILROAD MEDICARE TPI GROUP

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Oluwaseyi Ajayi?

The National Provider Identifier (NPI) for Oluwaseyi Ajayi is 1871741108, a Type 1 (individual) record in the CMS NPPES registry.

Where does Oluwaseyi Ajayi practice?

The practice location on file with NPPES is in Fairfax, VA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Brian Masterson Psychiatry Physician · Fairfax, VA NPI 1225062383 Sandy Ibrahim Family Medicine Physician · Fairfax, VA NPI 1437299658 Michael Kim Internal Medicine Physician · Fairfax, VA NPI 1235495219 Sara Williams Internal Medicine Physician · Fairfax, VA NPI 1730509720 Nader Silver Family Medicine Physician · Fairfax, VA NPI 1164804886 Sheila Hautbois Physician Assistant · Fairfax, VA NPI 1609376086 Tucker Landry Clinical Social Worker · Fairfax, VA NPI 1700364585

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-27.