Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Johnson Irvin Jr., M.D.

Hematology & Oncology Physician in Midlothian, VA · enumerated 2007.

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

National Provider Identifier

1700903242

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Registry record

Entity type Individual (Type 1)

Name Dr. William Johnson Irvin Jr.

Credential M.D.

Sex Male

Practice address 14051 St Francis Blvd, Suite 2210, Midlothian, VA, 23114

Phone (804) 893-8717

Fax (804) 594-3131

Enumeration date Mar 22, 2007

Last updated in NPPES Jul 5, 2012

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 2006-00276 (NC) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 2006-00276 (NC) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 0101251920 (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
C09633	Other	VA	GROUP 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

What specialty is William Irvin?

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

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-07-05.