Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jeffrey Slaney Williams Jr., O.D.

Optometrist in Riverhead, NY · enumerated 2007.

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

National Provider Identifier

1396945143

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Registry record

Entity type Individual (Type 1)

Name Dr. Jeffrey Slaney Williams Jr.

Credential O.D.

Sex Male

Practice address 887 Old Country Rd, Suite G-K-L, Riverhead, NY, 11901

Phone (631) 727-2858

Fax (631) 727-2866

Enumeration date Jul 19, 2007

Last updated in NPPES Oct 3, 2015

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 7157 (NY) Primary

152W00000X Optometrist Eye and Vision Services Providers · License 5755 (OH) Secondary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
02924216	Medicaid	NY	-
397137P	Other	NY	HIP

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 Jeffrey Williams?

Jeffrey Williams is registered in NPPES with the primary taxonomy of Optometrist. 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 2015-10-03.