Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Derek A. Irwin, MD

Q: What is the NPI number for Derek Irwin?

The National Provider Identifier (NPI) for Derek Irwin is 1184603300, a Type 1 (individual) record in the CMS NPPES registry.

Anatomic Pathology & Clinical Pathology Physician in Oklahoma City, OK · enumerated 2006 · practices at Diagnostic Pathology Services, Inc..

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

National Provider Identifier

1184603300

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Registry record

Entity type Individual (Type 1)

Name Dr. Derek A. Irwin

Credential MD

Sex Male

Practice address 225 Ne 97th St, Oklahoma City, OK, 73114

Phone (405) 842-2061

Fax (405) 842-3146

Enumeration date Jan 16, 2006

Last updated in NPPES Jul 1, 2015

Taxonomy & licenses

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 19794 (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
154966001	Medicaid	AR	-
100824700A	Medicaid	OK	-
731193626002	Other	OK	BCBS

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

What is the NPI number for Derek Irwin?

The National Provider Identifier (NPI) for Derek Irwin is 1184603300, a Type 1 (individual) record in the CMS NPPES registry.

Where does Derek Irwin practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-01.