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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JONATHAN D OU MD INC
NPI 1497199772
Internal Medicine in Chino, CA

Active since April 17, 2013CLIA 05D2074367 · Waiver
5562 PHILADELPHIA ST STE 311, CHINO, CA 91710(909) 465-6342(855) 830-1723 Get Directions Write a Review

NPPES record last updated: August 18, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

About Jonathan D Ou Md Inc NPPES

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

JONATHAN D OU MD INC (NPI 1497199772) is a healthcare organization registered as an internal medicine in Chino, California and active in the NPI registry since April 2013. The organization holds a CLIA Waiver certificate valid through March 6, 2028, maintains a secondary practice location in Diamond Bar, and lists Jonathan David Ou, President, as its authorized official.

NPPES Registry Identity

NPI1497199772
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameJONATHAN D OU MD INC
Location Address5562 PHILADELPHIA ST STE 311Chino, CA 91710-2499
Mailing Address5562 Philadelphia St Ste 311Chino, CA 91710-2499 · (909) 465-6342 · Fax (855) 830-1723
Phone(909) 465-6342
Fax(855) 830-1723
Organization SubpartNo
Authorized OfficialJonathan David OuPresident · (909) 465-6342
Enumeration DateApril 17, 2013
Last NPPES UpdateAugust 18, 2026
NPPES CertifiedAugust 18, 2026
✔ NPI 1497199772 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A113176
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedPediatricsTaxonomy 208000000X · License A113176 (CA)
5562 PHILADELPHIA ST STE 311, Chino, CA 91710
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Secondary Practice Location 1

Location 12707 S Diamond Bar Blvd, Suite 104Diamond Bar, CA 91765-3500 · Phone (909) 594-8331

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D2074367

Jonathan Ou, MD · Diamond Bar, CA
Active · expires Mar 6, 2028
CLIA Number05D2074367
Laboratory TypePhysician Office
Certificate Effective DateMarch 7, 2026
Certificate Expiration DateMarch 6, 2028
Laboratory DirectorJonathan Ou, MD
Laboratory Phone(909) 594-8331
Laboratory LocationJonathan Ou, MD2707 S Diamond Bar Blvd Ste 104, Diamond Bar, CA 91765
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Jonathan D Ou MD Inc's NPI number?

The NPI number for Jonathan D Ou MD Inc is 1497199772. It was assigned to this organization in the NPPES registry on April 17, 2013.

Where is Jonathan D Ou MD Inc located?

Jonathan D Ou MD Inc is located at 5562 Philadelphia St Ste 311, Chino, CA 91710. The listed phone number is (909) 465-6342.

What is Jonathan D Ou MD Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Does Jonathan D Ou MD Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D2074367) is associated with this NPI, valid through March 6, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Jonathan D Ou MD Inc was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 days 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.