Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James Dennis Sullivan, MD

Specialist in Great Neck, NY · enumerated 2006.

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

National Provider Identifier

1871563551

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Registry record

Entity type Individual (Type 1)

Name James Dennis Sullivan

Credential MD

Sex Male

Practice address 600 Northern Blvd, Suite 111, Great Neck, NY, 11021

Phone (516) 487-9454

Fax (516) 487-2745

Enumeration date Jan 25, 2006

Last updated in NPPES Mar 2, 2016

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 176543 (NY) 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
01839674	Medicaid	NY	-

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 James Sullivan?

James Sullivan is registered in NPPES with the primary taxonomy of Specialist. 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 2016-03-02.