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INTERNAL MEDICINE MEDICAL GROUP
NPI 1164625588
Internal Medicine - Endocrinology, Diabetes & Metabolism in Fontana, CA

Active since June 06, 2007
16465 SIERRA LAKES PARKWAY, INTERNAL MEDICINE MEDICAL GROUP SUITE, FONTANA, CA 92336(909) 770-8640(909) 770-8650 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Sep 11, 2025, Aug 22, 2020 (2 updates tracked since 2020).

About Internal Medicine Medical Group NPPES

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

INTERNAL MEDICINE MEDICAL GROUP (NPI 1164625588) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Fontana, California and active in the NPI registry since June 2007. The organization lists Adrienne Marie Walker, Contracts Manager, as its authorized official.

NPPES Registry Identity

NPI1164625588
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameINTERNAL MEDICINE MEDICAL GROUP
Location Address16465 SIERRA LAKES PARKWAY, INTERNAL MEDICINE MEDICAL GROUP SUITEFontana, CA 92336-1242
Mailing Address840 Towne Center Drive, Internal Medicine Medical GroupPomona, CA 91767-5900 · (909) 398-1550 · Fax (909) 398-1573
Phone(909) 770-8640
Fax(909) 770-8650
Organization SubpartNo
Authorized OfficialAdrienne Marie WalkerContracts Manager · (909) 398-1550
Enumeration DateJune 6, 2007
Last NPPES UpdateSeptember 11, 20252 updates tracked since enumeration
✔ NPI 1164625588 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
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 ListedInternal MedicineTaxonomy 207R00000X
16465 SIERRA LAKES PARKWAY, Fontana, CA 92336
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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

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHAPARRAL MEDICAL GROUP INC
Internal Medicine
16465 SIERRA LAKES PARKWAY, SUITE 250 CHAPARRAL MEDICAL GROUP INC
FONTANA, CA 92336
San Bernardino County (909) 770-8640
CUCAMONGA VALLEY MEDICAL GROUP, INC.
Family Medicine
16465 SIERRA LAKES PARKWAY, #300
FONTANA, CA 92336
San Bernardino County (909) 429-2864
SIERRA SAN ANTONIO MEDICAL CORPORATION
Family Medicine
16465 SIERRA LAKES PARKWAY, SUITE 100
FONTANA, CA 92336
San Bernardino County (909) 434-1150

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 Internal Medicine Medical Group's NPI number?

The NPI number for Internal Medicine Medical Group is 1164625588. It was assigned to this organization in the NPPES registry on June 6, 2007.

Where is Internal Medicine Medical Group located?

Internal Medicine Medical Group is located at 16465 Sierra Lakes Parkway Internal Medicine Medical Group Suite, Fontana, CA 92336. The listed phone number is (909) 770-8640.

What is Internal Medicine Medical Group's specialty?

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

When was this NPI record last updated?

The NPPES record for Internal Medicine Medical Group was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.