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SADDLEBACK MEDICAL GROUP INC
NPI 1386605822
Internal Medicine - Gastroenterology in Laguna Hills, CA

Active since March 31, 2006
24221 CALLE DE LA LOUISA, SUITE 400, LAGUNA HILLS, CA 92653(949) 465-8155(949) 465-8159 Get Directions Write a Review

NPPES record last updated: September 29, 2011. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Saddleback Medical Group Inc NPPES

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

SADDLEBACK MEDICAL GROUP INC (NPI 1386605822) is a healthcare organization registered as a gastroenterology in Laguna Hills, California and active in the NPI registry since March 2006. The organization lists James M Trenbeath, Medical Doctor, as its authorized official.

NPPES Registry Identity

NPI1386605822
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameSADDLEBACK MEDICAL GROUP INC
Location Address24221 CALLE DE LA LOUISA, SUITE 400Laguna Hills, CA 92653-7638
Mailing Address24221 Calle De La Louisa, Suite 400Laguna Hills, CA 92653-7638 · (949) 465-8155 · Fax (949) 465-8159
Phone(949) 465-8155
Fax(949) 465-8159
Organization SubpartNo
Authorized OfficialJames M TrenbeathMedical Doctor · (949) 465-8155
Enumeration DateMarch 31, 2006
Last NPPES UpdateSeptember 29, 2011
✔ NPI 1386605822 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.
24221 CALLE DE LA LOUISA, Laguna Hills, CA 92653
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Other Identifiers 2

Medicare UPINW17795
Medicare PINW13066CA

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)

Saddleback Medical Group Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

86

Medicare enrollment records show 86 clinicians reassign Medicare billing to Saddleback Medical Group Inc, which bills Medicare for the services they deliver. Of these, 17 practice at this address and 44 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 18

Internal Medicine30
Gastroenterology11
Family Practice10
Nurse Practitioner6
Pediatric Medicine5
Pathology4
Rheumatology4
Dermatology3
10 other specialties13

Nearest to this location (20)

See all 86
Alan White, MD
Infectious Disease
NPI 1548229701
24221 CALLE DE LA LOUISA STE 400
Laguna Hills, CA 92653
(949) 344-8270
✔ PECOS✔ Accepts MedicareSame address
Nickhat Ahmed, FNP
Nurse Practitioner
NPI 1669004578
24221 CALLE DE LA LOUISA STE 400
Laguna Hills, CA 92653
(949) 770-2085
✔ PECOSSame address
Shazia Ali, M.D.
Gastroenterology
NPI 1063616217
24221 CALLE DE LA LOUISA STE 300
Laguna Hills, CA 92653
(949) 334-8270
✔ PECOS✔ Accepts MedicareSame address
Arthur Daigneault, MD
Internal Medicine
NPI 1609845361
24221 CALLE DE LA LOUISA SUITE 200
Laguna Hills, CA 92653
(949) 588-8700
✔ PECOS✔ Accepts MedicareSame address
Kimvir Dhillon, MD
Endocrinology
NPI 1083673248
24221 CALLE DE LA LOUISA SUITE 300
Laguna Hills, CA 92653
(949) 465-8145
✔ PECOS✔ Accepts MedicareSame address
Barry Donner, MD
Gastroenterology
NPI 1679534796
24221 CALLE DE LA LOUISA SUITE 300
Laguna Hills, CA 92653
(949) 770-7163
✔ PECOS✔ Accepts MedicareSame address
Brian Henry
Internal Medicine
NPI 1629047824
24221 CALLE DE LA LOUISA SUITE 200
Laguna Hills, CA 92653
(949) 588-8700
✔ PECOS✔ Accepts MedicareSame address
Nathaniel Ho, M.D.
Nephrology
NPI 1497792147
24221 CALLE DE LA LOUISA SUITE 300
Laguna Hills, CA 92653
(949) 707-1059
✔ PECOS✔ Accepts MedicareSame address
Yong Sik Kim, MD
Internal Medicine
NPI 1033317565
24221 CALLE DE LA LOUISA STE 200
Laguna Hills, CA 92653
(949) 334-8270
✔ PECOS✔ Accepts MedicareSame address
Cuong Ly, M.D.
Nephrology
NPI 1306883053
24221 CALLE DE LA LOUISA SUITE 300
Laguna Hills, CA 92653
(949) 707-1059
✔ PECOS✔ Accepts MedicareSame address
Daniel Mckenzie, MD
Dermatology
NPI 1841259066
24221 CALLE DE LA LOUISA SUITE 400
Laguna Hills, CA 92653
(949) 465-8154
✔ PECOS✔ Accepts MedicareSame address
Priya Sharma
Gastroenterology
NPI 1205396827
24221 CALLE DE LA LOUISA STE 200
Laguna Hills, CA 92653
(949) 334-8270
✔ PECOS✔ Accepts MedicareSame address
Mark Shields, MD
Internal Medicine
NPI 1366411555
24221 CALLE DE LA LOUISA SUITE 200
Laguna Hills, CA 92653
(949) 588-8700
✔ PECOS✔ Accepts MedicareSame address
Cecilia Tran, MD
Internal Medicine
NPI 1578523031
24221 CALLE DE LA LOUISA SUITE 200
Laguna Hills, CA 92653
(949) 420-5980
✔ PECOS✔ Accepts MedicareSame address
Catherine Ngo, M.D.
Gastroenterology
NPI 1558531129
24221 CALLE DE LA LOUISA SUITE 300
Laguna Hills, CA 92653
(949) 770-7163
✔ PECOS✔ Accepts MedicareSame address
Louis Scarcella, MD
Internal Medicine
NPI 1821052598
24221 CALLE DE LA LOUISA SUITE 400
Laguna Hills, CA 92653
(949) 770-7691
✔ PECOSSame address
Maziar Zamani, M.D.
Internal Medicine
NPI 1518056027
24022 CALLE DE LA PLATA STE 405
Laguna Hills, CA 92653
(949) 404-5647
✔ PECOS✔ Accepts MedicareSame address
Lynn Granlund, M. D.
Internal Medicine
NPI 1902936552
24411 HEALTH CENTER DRIVE SUITE 460
Laguna Hills, CA 92653
(949) 373-7799
✔ PECOS0.1 mi
Benjamin Weinberg, MD
Gastroenterology
NPI 1598826612
24411 HEALTH CENTER DR STE 680
Laguna Hills, CA 92653
(657) 241-4280
✔ PECOS✔ Accepts Medicare0.1 mi
Mark Foster, M.D.
Family Practice
NPI 1548338908
24411 HEALTH CENTER DR SUITE 460
Laguna Hills, CA 92653
(949) 373-7799
✔ PECOS✔ Accepts Medicare0.1 mi
See all 86 clinicians

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 Saddleback Medical Group Inc's NPI number?

The NPI number for Saddleback Medical Group Inc is 1386605822. It was assigned to this organization in the NPPES registry on March 31, 2006.

Where is Saddleback Medical Group Inc located?

Saddleback Medical Group Inc is located at 24221 Calle De La Louisa Suite 400, Laguna Hills, CA 92653. The listed phone number is (949) 465-8155.

What is Saddleback Medical Group Inc's specialty?

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

Is Saddleback Medical Group Inc enrolled in Medicare?

Yes. Saddleback Medical Group Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Saddleback Medical Group Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 86 clinicians in 18 Medicare specialties reassign their Medicare billing to Saddleback Medical Group Inc. 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 Internal Medicine (30), Gastroenterology (11) and Family Practice (10). Of these, 17 practice at this address and 44 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 Saddleback Medical Group Inc was last updated on September 29, 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.