NPI Portal NPI Lookup & Verification

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

Dr. Stephan Michael Greenberg, M.D.

Ophthalmology Physician in Hornell, NY · enumerated 2006.

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

National Provider Identifier

1881792604

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Registry record

Entity type Individual (Type 1)
Name Dr. Stephan Michael Greenberg
Credential M.D.
Sex Male
Practice address Hornell, NY, 14843
Phone (607) 324-4480
Fax (607) 324-3453
Enumeration date Sep 20, 2006
Last updated in NPPES Nov 29, 2016

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

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 099238 (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
161003515 Other NY TAX ID
00663272 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

How do I verify Stephan Greenberg's NPI record?
Cross-check NPI 1881792604 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1881792604 active?
Yes, as of the latest NPPES snapshot, NPI 1881792604 is active (record last updated 2016-11-29).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-11-29.