Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Allergy and Asthma Experts, Pllc

Allergy & Immunology Physician in Oklahoma City, OK · enumerated 2014 · authorized official Timothy Trojan, Physician / Manager.

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

National Provider Identifier

1003217548

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Registry record

Entity type Organization (Type 2)

Legal business name Allergy and Asthma Experts, Pllc

Practice address 1810 E Memorial Rd, Oklahoma City, OK, 73131

Phone (405) 607-4333

Fax (405) 607-4404

Enumeration date Sep 15, 2014

Last updated in NPPES Sep 15, 2014

Taxonomy & classification

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians Primary

207KA0200X Allergy Physician Allopathic & Osteopathic Physicians Secondary

207RA0201X Allergy & Immunology (Internal Medicine) Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Timothy Trojan

Title Physician / Manager

Phone (214) 886-4800

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

Where is Allergy and Asthma Experts, Pllc located?

The practice location on file with NPPES is in Oklahoma City, OK.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2014-09-15. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-15.