HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / NJ

GREGORIO J GUILLEN, MD

INTERNAL MEDICINE

Graduated: 1982

Also: GERIATRIC MEDICINE

NPI: 1538252226

Practice Locations (1)

400 STATE ST, SUITE 2

PERTH AMBOY, NJ 088613486

7324426020

Source: CMS National Downloadable File, September 2026.

GREGORIO GUILLEN, MD | HealthCareAtlasUSA