Gregorio GuillenM.D
Internal Medicine·Perth Amboy, NJ
Gregorio Guillen, M.D is an Internal Medicine provider in Perth Amboy, NJ, as of July 2026.
- NPI1538252226
- Registered2006
- Class of1982
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Gregorio Guillen at a glance
- Provider
- Gregorio Guillen
- Credential
- M.D
- Specialty
- Internal Medicine
- Procedures
- Internal Medicine CPT codes
- Location
- Perth Amboy, NJ
- Medical school graduation
- 1982
- NPI registered
- 2006
- NPI
- 1538252226
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Gregorio Guillen practice?
Gregorio Guillen, M.D is based in Perth Amboy, NJ. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Gregorio Guillen's NPI number?
Gregorio Guillen's National Provider Identifier (NPI) is 1538252226, registered in 2006. Specialty on record: Internal Medicine; credential M.D.
How many Internal Medicine providers in New Jersey work at ambulatory surgery centers?
38 Internal Medicine surgeons and proceduralists in New Jersey are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Gregorio Guillen among them. The New Jersey Internal Medicine directory lists each one by city with credential, NPI, and center affiliations.
Pilot Analysis
Get the complete Gregorio Guillen analysis
Tell us where to send it. Our team will prepare an analysis of Gregorio Guillen covering case volumes, referral patterns, payer mix, and how specialty peers compare, and email it to you within 5-10 business days. Need it faster? Book a demo.