Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Alexander Christian Duffy, PA-C

Physician Assistant in Lewisberry, PA · enumerated 2016.

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

National Provider Identifier

1053774257

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Registry record

Entity type Individual (Type 1)

Name Alexander Christian Duffy

Credential PA-C

Sex Male

Practice address Lewisberry, PA, 17339

Phone (717) 932-4050

Fax (717) 932-8072

Enumeration date Apr 4, 2016

Last updated in NPPES Apr 14, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License OA003819 (PA) Primary

Other identifiers

Identifier	Type	State	Issuer
524671F6K	Other	PA	MEDICARE
1032099520001	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

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 Alexander Duffy?

Alexander Duffy is registered in NPPES with the primary taxonomy of Physician Assistant. 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 2022-04-14.