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Gregorio J. Guillen MD, PC

Internal Medicine Physician in Perth Amboy, NJ · enumerated 2006 · authorized official Gregorio Guillen, President.

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

National Provider Identifier

1518052950

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Registry record

Entity type Organization (Type 2)
Legal business name Gregorio J. Guillen MD, PC
Practice address 400 State St., Suite 2, Perth Amboy, NJ, 08861
Phone (732) 442-6020
Fax (732) 442-1995
Enumeration date Oct 3, 2006
Last updated in NPPES Sep 11, 2013

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MA56159 (NJ) Primary

Authorized official

Name Gregorio Guillen
Title President
Phone (732) 442-6020

Other identifiers

Identifier Type State Issuer
6523706 Medicaid NJ -

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

Where is Gregorio J. Guillen MD, PC located?
The practice location on file with NPPES is in Perth Amboy, NJ.
How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2013-09-11. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-09-11.