Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Alexander S Elfenbein Physician PC

Q: What is the NPI number for Alexander S Elfenbein Physician PC?

The NPI for Alexander S Elfenbein Physician PC is 1801968912, a Type 2 (organization) record in the CMS NPPES registry.

Cardiovascular Disease Physician in Valley Stream, NY · enumerated 2006 · authorized official Alexander Elfenbein, Owner.

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

National Provider Identifier

1801968912

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Registry record

Entity type Organization (Type 2)

Legal business name Alexander S Elfenbein Physician PC

Practice address 40 East Merrick Road, Ste 104, Valley Stream, NY, 11580

Phone (516) 568-2121

Fax (516) 568-0426

Enumeration date Nov 14, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 1637251 (NY) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 1637251 (NY) Primary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 1637251 (NY) Secondary

Authorized official

Name Alexander Elfenbein

Title Owner

Phone (516) 568-2121

Other identifiers

Identifier	Type	State	Issuer
01063809	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Alexander S Elfenbein Physician PC?

The NPI for Alexander S Elfenbein Physician PC is 1801968912, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Alexander S Elfenbein Physician PC?

NPPES lists Alexander Elfenbein (Owner) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.