Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Ronald Zielinski

Surgery Physician in Patchogue, NY · enumerated 2017.

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

National Provider Identifier

1235661133

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Ronald Zielinski

Sex Male

Practice address 157 E Woodside Ave, Patchogue, NY, 11772

Phone (631) 475-1900

Fax (631) 475-1955

Enumeration date Mar 30, 2017

Last updated in NPPES Dec 18, 2023

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 315683 (NY) Primary

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

Is NPI 1235661133 active?

Yes, as of the latest NPPES snapshot, NPI 1235661133 is active (record last updated 2023-12-18).

How do I verify Gregory Zielinski's NPI record?

Cross-check NPI 1235661133 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-12-18.