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WU & DIAZ PROFESSIONAL CORP
NPI 1548356884
Family Medicine in Ontario, CA

Active since October 05, 2006
3550 E PHILADELPHIA STREET, SUITE # 150, ONTARIO, CA 91761(909) 773-0022(866) 672-8222 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

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

About Wu & Diaz Professional Corp NPPES

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

WU & DIAZ PROFESSIONAL CORP (NPI 1548356884), doing business as Care First Medical Group Inc, is a healthcare organization registered as a family medicine in Ontario, California and active in the NPI registry since October 2006. The organization lists Jack X Wu, Secretary, as its authorized official.

NPPES Registry Identity

NPI1548356884
Entity TypeOrganization
Primary Taxonomy207Q00000X
Legal Business NameWU & DIAZ PROFESSIONAL CORP
Location Address3550 E PHILADELPHIA STREET, SUITE # 150Ontario, CA 91761
Mailing Address3550 E Philadelphia Street, Suite # 150Ontario, CA 91761 · (909) 773-0022 · Fax (866) 672-8222
Phone(909) 773-0022
Fax(866) 672-8222
Organization SubpartNo
Authorized OfficialJack X WuSecretary · (909) 773-0022
Enumeration DateOctober 5, 2006
Last NPPES UpdateSeptember 11, 20252 updates tracked since enumeration
✔ NPI 1548356884 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · 20A8127
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedInternal MedicineTaxonomy 207R00000X · License A69486 (CA)
3550 E PHILADELPHIA STREET, Ontario, CA 91761
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Other Names 1

Doing Business AsCare First Medical Group Inc

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

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 Wu & Diaz Professional Corp's NPI number?

The NPI number for Wu & Diaz Professional Corp is 1548356884. It was assigned to this organization in the NPPES registry on October 5, 2006. The provider is doing business as Care First Medical Group Inc.

Where is Wu & Diaz Professional Corp located?

Wu & Diaz Professional Corp is located at 3550 E Philadelphia Street Suite # 150, Ontario, CA 91761. The listed phone number is (909) 773-0022.

What is Wu & Diaz Professional Corp's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

When was this NPI record last updated?

The NPPES record for Wu & Diaz Professional Corp 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.