Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Larry J Greidinger, OD

Optometrist in Lawrenceville, NJ · enumerated 2005.

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

National Provider Identifier

1649278839

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Registry record

Entity type Individual (Type 1)

Name Dr. Larry J Greidinger

Credential OD

Sex Male

Practice address 4 Princess Rd, Ste 202, Lawrenceville, NJ, 08648

Phone (609) 219-9000

Fax (609) 219-1313

Enumeration date Jul 12, 2005

Last updated in NPPES Dec 18, 2024

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 27OA00396800 (NJ) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 27TO00049400 (NJ) Primary

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
0116010	Other	NJ	AETNA
0760404	Medicaid	NJ	-
222516468	Other	NJ	HORIZON

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 Larry Greidinger?

Larry Greidinger 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 2024-12-18.