Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William E Byrne III, M.D.

Obstetrics & Gynecology Physician in Harrisburg, PA · enumerated 2006.

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

National Provider Identifier

1356321939

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Registry record

Entity type Individual (Type 1)

Name Dr. William E Byrne III

Credential M.D.

Sex Male

Practice address 2645 N 3rd St, Harrisburg, PA, 17110

Phone (717) 782-4700

Fax (717) 782-4710

Enumeration date Jan 19, 2006

Last updated in NPPES Jan 26, 2021

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License MD020266E (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
001142010	Medicaid	PA	-
3432291	Other	PA	AETNA HMO PROVIDER NUMBER
5329109	Other	PA	AETNA PPO PROVIDER NUMBER
50026615	Other	PA	CAPITAL BLUE CROSS
25755	Other	PW	HIGHMARK BLUE SHIELD

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 does William Byrne practice?

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

What is the NPI number for William Byrne?

The National Provider Identifier (NPI) for William Byrne is 1356321939, 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 2021-01-26.