Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Northwood Gilleland Jr., M.D.

Surgery Physician in New Castle, PA · enumerated 2005.

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

National Provider Identifier

1336145903

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Registry record

Entity type Individual (Type 1)

Name Dr. William Northwood Gilleland Jr.

Credential M.D.

Sex Male

Practice address 26 Nesbitt Rd, Suite 151, New Castle, PA, 16105

Phone (724) 652-3616

Fax (724) 656-6679

Enumeration date Jun 28, 2005

Last updated in NPPES May 10, 2021

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License MD046830L (PA) 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
0014666800001	Medicaid	PA	-
122440	Other	PA	MEDICARE ID
0014666800005	Medicaid	PA	-

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

Where does William Gilleland practice?

The practice location on file with NPPES is in New Castle, PA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Gilleland?

The National Provider Identifier (NPI) for William Gilleland is 1336145903, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-10.