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JEFFREY R UNGER, M.D. INC
NPI 1750556346
Internal Medicine - Endocrinology, Diabetes & Metabolism in Chino, CA

Active since April 24, 2008
5385 WALNUT AVE, SUITE 3, CHINO, CA 91710(909) 590-8409(909) 590-8695 Get Directions Write a Review

NPPES record last updated: July 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Jeffrey R Unger, M.d. Inc NPPES

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

JEFFREY R UNGER, M.D. INC (NPI 1750556346) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Chino, California and active in the NPI registry since April 2008. The organization lists Jeffrey Robert Unger, President, as its authorized official.

NPPES Registry Identity

NPI1750556346
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameJEFFREY R UNGER, M.D. INC
Location Address5385 WALNUT AVE, SUITE 3Chino, CA 91710-2605
Mailing Address5405 Canistel AveAlta Loma, CA 91737-6727 · (909) 590-8409 · Fax (909) 590-8695
Phone(909) 590-8409
Fax(909) 590-8695
Organization SubpartNo
Authorized OfficialJeffrey Robert UngerPresident · (909) 590-8409
Enumeration DateApril 24, 2008
Last NPPES UpdateJuly 16, 2026
NPPES CertifiedJuly 16, 2026
✔ NPI 1750556346 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · G45569
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedFamily MedicineTaxonomy 207Q00000X
5385 WALNUT AVE, Chino, CA 91710
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

Jeffrey R Unger, M.d. Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Jeffrey R Unger, M.D. Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Jeffrey Unger, M.D.
Internal Medicine
NPI 1003856188
9220 HAVEN AVE STE 230
Rancho Cucamonga, CA 91730
(909) 590-8409
✔ PECOS7.6 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 Jeffrey R Unger, M.D. Inc's NPI number?

The NPI number for Jeffrey R Unger, M.D. Inc is 1750556346. It was assigned to this organization in the NPPES registry on April 24, 2008.

Where is Jeffrey R Unger, M.D. Inc located?

Jeffrey R Unger, M.D. Inc is located at 5385 Walnut Ave Suite 3, Chino, CA 91710. The listed phone number is (909) 590-8409.

What is Jeffrey R Unger, M.D. Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Jeffrey R Unger, M.D. Inc enrolled in Medicare?

Yes. Jeffrey R Unger, M.D. Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Jeffrey R Unger, M.D. Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Jeffrey R Unger, M.D. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Jeffrey R Unger, M.D. Inc was last updated on July 16, 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.