ESSEX GASTRO ASSOCIATES, PA
NPI 1114933926
Internal Medicine - Gastroenterology in Newark, NJ
About Essex Gastro Associates, Pa NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ESSEX GASTRO ASSOCIATES, PA (NPI 1114933926), doing business as Firpo Guerrero, Md, Pa, is a healthcare organization registered as a gastroenterology in Newark, New Jersey and active in the NPI registry since August 2006. The organization lists Firpo Eugenio Guerrero, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Essex Gastro Associates, Pa is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
9Medicare enrollment records show 9 clinicians reassign Medicare billing to Essex Gastro Associates, PA, which bills Medicare for the services they deliver. Of these, 2 practice at this address and 3 within 10 miles. They are listed nearest first.
Clinicians, nearest first (9)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Essex Gastro Associates, PA's NPI number?
The NPI number for Essex Gastro Associates, PA is 1114933926. It was assigned to this organization in the NPPES registry on August 1, 2006. The provider was formerly known as Firpo Guerrero, MD, PA.
Where is Essex Gastro Associates, PA located?
Essex Gastro Associates, PA is located at 275 Chestnut St, Newark, NJ 07105. The listed phone number is (973) 589-5545.
What is Essex Gastro Associates, PA's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Essex Gastro Associates, PA enrolled in Medicare?
Yes. Essex Gastro Associates, PA is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Essex Gastro Associates, PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 5 Medicare specialties reassign their Medicare billing to Essex Gastro Associates, PA. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Anesthesiology (3), Nurse Practitioner (2) and Pathology (2). Of these, 2 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Essex Gastro Associates, PA accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Essex Gastro Associates, PA as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Essex Gastro Associates, PA was last updated on May 13, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Essex Gastro Associates, Pa · NPI 1114933926
Gastroenterology organization in Newark, New Jersey. Organization record, active in the CMS NPPES registry since August 1, 2006.
## Identity
- **NPI:** 1114933926 (Entity type: Organization)
- **Enumerated:** August 1, 2006
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Organization subpart:** No
- **Authorized official:** Firpo Guerrero, PRESIDENT
## Practice location
- **Address:** 275 CHESTNUT ST, Newark, NJ 07105-1570
- **Phone:** (973) 589-5545 · **Fax:** (973) 589-0073
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 9 clinicians in 5 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Anesthesiology (3), Nurse Practitioner (2), Pathology (2); 2 practice at this address and 3 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 13, 2011
- **Other identifiers:** Medicare PIN 082100 (NJ); Medicaid 0036633 (NJ)
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Source: [NPI Profile](https://npiprofile.com/npi/1114933926) · Data from the CMS NPPES public registry.