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ARROWHEAD PATHOLOGY MEDICAL GROUP INCORPORATED
NPI 1508132366
Pathology - Anatomic Pathology & Clinical Pathology in Colton, CA

Active since March 27, 2012
400 N. PEPPER AVE., COLTON, CA 92324(909) 580-0010(909) 580-0064 Get Directions Write a Review

NPPES record last updated: August 3, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Arrowhead Pathology Medical Group Incorporated NPPES

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

ARROWHEAD PATHOLOGY MEDICAL GROUP INCORPORATED (NPI 1508132366), doing business as Herbert Braunstein M.d. And Robrt A. Stewart, M.d. Inc., is a healthcare organization registered as an anatomic pathology & clinical pathology in Colton, California and active in the NPI registry since March 2012. The organization lists Ahmad Ibrahim, President, as its authorized official.

NPPES Registry Identity

NPI1508132366
Entity TypeOrganization
Primary Taxonomy207ZP0102X
Legal Business NameARROWHEAD PATHOLOGY MEDICAL GROUP INCORPORATED
Location Address400 N. PEPPER AVE.Colton, CA 92324-1819
Mailing Address400 N Pepper AveColton, CA 92324-1801 · (909) 580-0010 · Fax (909) 580-0064
Phone(909) 580-0010
Fax(909) 580-0064
Organization SubpartNo
Authorized OfficialAhmad IbrahimPresident · (909) 580-0010
Enumeration DateMarch 27, 2012
Last NPPES UpdateAugust 3, 2026
NPPES CertifiedAugust 3, 2026
✔ NPI 1508132366 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in CA · C0625387
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
400 N. PEPPER AVE., Colton, CA 92324
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Other Names 1

Former Legal Business NameHerbert Braunstein M.d. And Robrt A. Stewart, M.d. Inc.

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)

Arrowhead Pathology Medical Group Incorporated is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

3

Medicare enrollment records show 3 clinicians reassign Medicare billing to Arrowhead Pathology Medical Group Incorporated, 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 (3)

Ahmad Ibrahim, M.D.
Pathology
NPI 1356754840
400 N PEPPER AVE
Colton, CA 92324
(909) 580-0010
✔ PECOS✔ Accepts MedicareSame address
John Magpayo, MD
Pathology
NPI 1093829251
400 N PEPPER AVE
Colton, CA 92324
(909) 580-0010
✔ PECOSSame address
Ellen Ko, M.D.
Pathology
NPI 1124047501
400 N PEPPER AVENUE ARMC PATHOLOGY
Colton, CA 92324
(909) 580-0010
✔ PECOS0.2 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 Arrowhead Pathology Medical Group Incorporated's NPI number?

The NPI number for Arrowhead Pathology Medical Group Incorporated is 1508132366. It was assigned to this organization in the NPPES registry on March 27, 2012. The provider was formerly known as Herbert Braunstein M.D. and Robrt A. Stewart, M.D. Inc..

Where is Arrowhead Pathology Medical Group Incorporated located?

Arrowhead Pathology Medical Group Incorporated is located at 400 N. Pepper Ave., Colton, CA 92324. The listed phone number is (909) 580-0010.

What is Arrowhead Pathology Medical Group Incorporated's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Arrowhead Pathology Medical Group Incorporated enrolled in Medicare?

Yes. Arrowhead Pathology Medical Group Incorporated is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Arrowhead Pathology Medical Group Incorporated?

According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians, all in Pathology, reassign their Medicare billing to Arrowhead Pathology Medical Group Incorporated. 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. 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.

When was this NPI record last updated?

The NPPES record for Arrowhead Pathology Medical Group Incorporated was last updated on August 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.