Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Timothy David Trojan, MD

Allergy & Immunology Physician in Enid, OK · enumerated 2008.

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

National Provider Identifier

1518125053

Verified

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Registry record

Entity type Individual (Type 1)

Name Timothy David Trojan

Credential MD

Sex Male

Practice address 3201 N Van Buren St, Suite 350, Enid, OK, 73703

Phone (580) 366-0844

Fax (580) 297-5197

Enumeration date May 31, 2008

Last updated in NPPES Oct 31, 2023

Taxonomy & licenses

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License 29671 (OK) 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
200572740B	Medicaid	OK	-
323602ZQR2	Other	OK	MEDICARE PTAN

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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Timothy Trojan?

Timothy Trojan is registered in NPPES with the primary taxonomy of Allergy & Immunology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Integris Rural Health Inc Otolaryngology Physician · Enid, OK NPI 1881687184 Jerome Dilling Otolaryngology Physician · Enid, OK NPI 1336118801 Robi Chatterji Family Medicine Physician · Enid, OK NPI 1750322459 Robi P Chatterji MD PC Family Medicine Physician · Enid, OK NPI 1619992864 Seth H Switzer MD PC Family Medicine Physician · Enid, OK NPI 1447275508 Northwest Pulmonary Physicians PC Pulmonary Disease Physician · Enid, OK NPI 1174548127 Michael O'Quin Pediatrics Physician · Enid, OK NPI 1053401604 J.M.Dilling,Jr.,M.D.Jr.,Inc Specialist · Enid, OK NPI 1891819819

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-31.