NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Robert Michael Lazar, MD

Gastroenterology Physician in Commack, NY · enumerated 2005 · practices at Robert M Lazar MD PC.

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

National Provider Identifier

1730164179

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Registry record

Entity type Individual (Type 1)
Name Dr. Robert Michael Lazar
Credential MD
Sex Male
Practice address Commack, NY, 11725
Phone (631) 543-8660
Fax (631) 543-8661
Enumeration date Dec 8, 2005
Last updated in NPPES Feb 4, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 153441 (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
2593739 Other - GHI
71232 Other - GHI (HMO)
29866 Other - AETNA / US HEALTHCARE
31048 Other - VYTRA
AA50365 Other - MDNY
0001755 Other - IND. HEALTH
0270298 Other NY CIGNA
CS317 Other - OXFORD
4C3299 Other - HEALTHNET
3V6281 Other NY BLUE CHOICE

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 Robert Lazar?
Robert Lazar is registered in NPPES with the primary taxonomy of Gastroenterology 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 2022-02-04.