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

Q: 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.

Q: What is Jonathan D Ou MD Inc's specialty?

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

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: October 25, 2026.

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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

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Jonathan D Ou Md Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Jonathan D Ou MD Inc, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Jonathan Ou, M.D

Internal Medicine

NPI 1518109719

5562 PHILADELPHIA ST STE 311
Chino, CA 91710

(909) 465-6342

✔ PECOS✔ Accepts MedicareSame address

Sarom Pyun, M.D.

Family Practice

NPI 1104264472

1514 VALLEY VISTA DR
Diamond Bar, CA 91765

(909) 860-1144

✔ PECOS✔ Accepts Medicare9.3 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA 2

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.

Certificate of Waiver 05D2120308

Jonathan Ou, MD · Chino, CA

Expired · Oct 12, 2026

CLIA Number05D2120308

Laboratory TypePhysician Office

Certificate Effective DateOctober 13, 2024

Certificate Expiration DateOctober 12, 2026

Laboratory DirectorJonathan Ou, MD

Laboratory Phone(909) 465-6342

Laboratory LocationJonathan Ou, MD5562 Philadelphia St Ste 311, Chino, CA 91710

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.

Is Jonathan D Ou MD Inc enrolled in Medicare?

Yes. Jonathan D Ou MD Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Jonathan D Ou MD Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Jonathan D Ou MD Inc, in Family Practice and Internal Medicine. 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. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 2 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.