1. Home
  2. Directory
  3. California
  4. Torrance
  5. Internal Medicine
  6. NPI Profile

SOUTH BAY GASTROENTEROLOGY MEDICAL GROUP
NPI 1609893619
Internal Medicine - Gastroenterology in Torrance, CA

Active since July 16, 2006
23456 HAWTHORNE BLVD STE 300, TORRANCE, CA 90505(310) 539-2055(310) 539-0199 Get Directions Write a Review

NPPES record last updated: September 11, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 4, 2021, Aug 21, 2019 (2 updates tracked since 2019).

About South Bay Gastroenterology Medical Group NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SOUTH BAY GASTROENTEROLOGY MEDICAL GROUP (NPI 1609893619) is a healthcare organization registered as a gastroenterology in Torrance, California and active in the NPI registry since July 2006. The organization lists Oren Zaidel, Medical Director, as its authorized official.

NPPES Registry Identity

NPI1609893619
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameSOUTH BAY GASTROENTEROLOGY MEDICAL GROUP
Location Address23456 HAWTHORNE BLVD STE 300Torrance, CA 90505-4716
Mailing Address23456 Hawthorne Blvd Ste 300Torrance, CA 90505-4716 · (310) 539-2055 · Fax (310) 539-0199
Phone(310) 539-2055
Fax(310) 539-0199
Organization SubpartNo
Authorized OfficialOren ZaidelMedical Director · (310) 539-2055
Enumeration DateJuly 16, 2006
Last NPPES UpdateSeptember 11, 20232 updates tracked since enumeration
NPPES CertifiedSeptember 11, 2023
✔ NPI 1609893619 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
23456 HAWTHORNE BLVD STE 300, Torrance, CA 90505
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

South Bay Gastroenterology Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

13

Medicare enrollment records show 13 clinicians reassign Medicare billing to South Bay Gastroenterology Medical Group, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 10 within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 2

Gastroenterology8
Nurse Practitioner5

Clinicians, nearest first (13)

Yesenia French, FNP
Nurse Practitioner
NPI 1760243521
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts MedicareSame address
Jung Li, NP-BC
Nurse Practitioner
NPI 1720501240
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Minh Nguyen, M.D.
Gastroenterology
NPI 1922254432
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Daniel Cho, M.D.
Gastroenterology
NPI 1346433828
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Jerome Cohen, M.D.
Gastroenterology
NPI 1922036474
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Liam Heng, AGACNP
Nurse Practitioner
NPI 1316331838
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Tonny Lee, M.D.
Gastroenterology
NPI 1639118748
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Gloria Sze, M.D.
Gastroenterology
NPI 1528004090
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Oren Zaidel, M.D.
Gastroenterology
NPI 1689602195
23456 HAWTHORNE BLVD STE 300
Torrance, CA 90505
(310) 539-2055
✔ PECOS✔ Accepts Medicare0.1 mi
Melissa Munsell, M.D.
Gastroenterology
NPI 1134276272
2780 SKYPARK DR STE 125
Torrance, CA 90505
(310) 530-8013
✔ PECOS✔ Accepts Medicare1.0 mi
Mary Ahmadian, N.P.
Nurse Practitioner
NPI 1952812448
GLOBAL TRANSITIONAL CARE SUITE 100 2 EXECUTIVE CIRCLE
Irvine, CA 92614
(949) 679-3210
✔ PECOS✔ Accepts Medicare30 mi
Ronaldo Mamaril, NP
Nurse Practitioner
NPI 1013301266
1225 HARDING PL STE 5100
Charlotte, NC 28204
(704) 355-8850
✔ PECOS✔ Accepts Medicare2,130 mi
Fouzia Oza, M.D.
Gastroenterology
NPI 1023540861
700 QUINCY AVE
Scranton, PA 18510
(570) 770-5000
✔ PECOS✔ Accepts Medicare2,375 mi

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 South Bay Gastroenterology Medical Group's NPI number?

The NPI number for South Bay Gastroenterology Medical Group is 1609893619. It was assigned to this organization in the NPPES registry on July 16, 2006.

Where is South Bay Gastroenterology Medical Group located?

South Bay Gastroenterology Medical Group is located at 23456 Hawthorne Blvd Ste 300, Torrance, CA 90505. The listed phone number is (310) 539-2055.

What is South Bay Gastroenterology Medical Group's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is South Bay Gastroenterology Medical Group enrolled in Medicare?

Yes. South Bay Gastroenterology Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through South Bay Gastroenterology Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 13 clinicians in 2 Medicare specialties reassign their Medicare billing to South Bay Gastroenterology Medical Group. 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 Gastroenterology (8) and Nurse Practitioner (5). Of these, 1 practice at this address and 10 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for South Bay Gastroenterology Medical Group was last updated on September 11, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.