Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Arthur Leroy Williams II, MD

Infectious Disease Physician in Harrisburg, PA · enumerated 2006 · practices at Hamilton Health Center.

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

National Provider Identifier

1104924539

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Registry record

Entity type Individual (Type 1)

Name Dr. Arthur Leroy Williams II

Credential MD

Sex Male

Practice address 1821 Fulton St, Harrisburg, PA, 17102

Phone (717) 230-3906

Fax (717) 230-3914

Enumeration date Sep 20, 2006

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License MD055892L (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
001623352	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 Arthur Williams?

Arthur Williams is registered in NPPES with the primary taxonomy of Infectious Disease 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 2007-07-09.