Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Gregorio J. Guillen MD, PC

Organization Internal Medicine Physician · NPI 1518052950

Gregorio J. Guillen MD, PC is an Internal Medicine Physician in Perth Amboy, New Jersey. Licensed in New Jersey. Registered with an NPI since 2006.

Licensed in
NJ
In the registry since
2006
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

400 State St Ste 2
Perth Amboy, NJ 08861
Phone: (732) 442-6020
Fax: (732) 442-1995
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MA56159 (NJ)

Record details

NPI number1518052950
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Gregorio Guillen — President · (732) 442-6020
NPI enumeratedOctober 3, 2006
Last updated in NPPESSeptember 11, 2013
Mailing addressPo Box 1068, Perth Amboy, NJ 08862-1068

Other providers in Perth Amboy