Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William G Irwin, MD

Dermatology Physician in Warner Robins, GA · enumerated 2005.

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

National Provider Identifier

1316931017

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Registry record

Entity type Individual (Type 1)

Name William G Irwin

Credential MD

Sex Male

Practice address 212 Hospital Dr, Ste C, Warner Robins, GA, 31088

Phone (478) 922-9281

Fax (478) 328-0438

Enumeration date Sep 8, 2005

Last updated in NPPES Apr 23, 2015

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 012172 (GA) Primary

207NS0135X Procedural Dermatology Physician Allopathic & Osteopathic Physicians · License 012172 (GA) Secondary

207NP0225X Pediatric Dermatology Physician Allopathic & Osteopathic Physicians · License 012172 (GA) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 012172 (GA) Secondary

207ND0900X Dermatopathology Physician Allopathic & Osteopathic Physicians · License 012172 (GA) Secondary

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
P00167982	Other	GA	RAILROAD MEDICARE
0007629024	Medicaid	GA	-
DC4061	Other	GA	RAILROAD MEDICARE

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 William Irwin?

William Irwin is registered in NPPES with the primary taxonomy of Dermatology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-04-23.