Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Wu & Diaz Professional Corp

Organization Family Medicine Physician · NPI 1548356884

Wu & Diaz Professional Corp is a Family Medicine Physician in Ontario, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
Corp — Corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

3550 E Philadelphia St Ste # 150
Ontario, CA 91761
Phone: (909) 773-0022
Fax: (866) 672-8222
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 20A8127 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A69486 (CA)

Record details

NPI number1548356884
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Jack Wu — Secretary · (909) 773-0022
Other names Care First Medical Group Inc
NPI enumeratedOctober 5, 2006
Last updated in NPPESSeptember 11, 2025
Mailing address3550 E Philadelphia Street, Suite # 150, Ontario, CA 91761

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