Gregorio J. Guillen MD, PC
NPI 1518052950 · Internal Medicine Physician · Perth Amboy, NJ
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregorio J. Guillen MD, PC is a Internal Medicine Physician organization in Perth Amboy, NJ (NPI 1518052950).
Provider details
- NPI number
- 1518052950
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Gregorio Guillen, President(732) 442-6020
- License
- MA56159 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-03
- Last updated
- 2013-09-11
Frequently asked questions
- What is Gregorio J. Guillen MD, PC's NPI number?
- Gregorio J. Guillen MD, PC's National Provider Identifier (NPI) is 1518052950, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Gregorio J. Guillen MD, PC?
- Gregorio J. Guillen MD, PC is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregorio J. Guillen MD, PC located?
- Gregorio J. Guillen MD, PC's practice location on file with NPPES is 400 State St., Perth Amboy, NJ 08861.
- What is Gregorio J. Guillen MD, PC's phone number?
- The practice phone number listed in the NPPES registry for Gregorio J. Guillen MD, PC is (732) 442-6020.
- Does Gregorio J. Guillen MD, PC accept Medicare?
- Gregorio J. Guillen MD, PC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Gregorio J. Guillen MD, PC?
- The authorized official listed on Gregorio J. Guillen MD, PC's NPPES record is Gregorio Guillen, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Gregorio J. Guillen MD, PC's NPI active?
- Yes — Gregorio J. Guillen MD, PC's NPI (1518052950) is active in the NPPES registry as of the last update on 2013-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.