Jonathan David Ou, M.D
Internal Medicine Physician · Diamond Bar, CA
Jonathan David Ou, M.D is an internal medicine physician with a practice address in Diamond Bar, California, and NPI 1518109719, issued on Apr 2, 2009. Check the license (California A113176, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jonathan David Ou
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A113176 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2707 S Diamond Bar Blvd Ste 104, Diamond Bar, CA 91765
- Phone
- (909) 594-8331
- Enumerated
- Apr 2, 2009
- Record last updated
- Aug 20, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130717000789); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Jonathan David Ou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A113176Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% more Medicare Part D claims than the average internal medicine physician in 2024
4,509 Medicare Part D claims for 396 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium500 claims
- Metformin Hcl310 claims
- Losartan Potassium281 claims
- Amlodipine Besylate246 claims
- Lisinopril236 claims
- Levothyroxine Sodium159 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $25.10
1 payment: food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan David Ou among 17,696 internal medicine physician records in California
Jonathan David Ou, M.D is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2004 among the 11,065 with a school on file
- Record last updated2018 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 internal medicine physician records list a practice address in Diamond Bar
They are 11 of the 598 NPPES records with a practice address in Diamond Bar, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Diamond Bar → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lorindha Argudo, MDDiamond Bar, CA 917651750477824
- Steve Chan, MDDiamond Bar, CA 917651790750743
- Edwin Chuong, M.D.Diamond Bar, CA 917651427231802
- Claire Daniel, MDDiamond Bar, CA 917651851928428
- Chandan Gowda, DODiamond Bar, CA 917651730575473
- Michael Kwok, M.D.Diamond Bar, CA 917651881717197
- Manish Mehta, M.D.Diamond Bar, CA 917651790085223
- Yuh-Huey Wang, MDDiamond Bar, CA 917651588639538
Common questions
What is Jonathan David Ou, M.D's NPI number?
Jonathan David Ou, M.D's National Provider Identifier (NPI) is 1518109719, issued on Apr 2, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan David Ou, M.D located?
The NPPES record lists a practice address at 2707 S Diamond Bar Blvd Ste 104, Diamond Bar, CA, 91765. Phone: (909) 594-8331. Providers update this record themselves, so call before visiting.
How can I verify Jonathan David Ou, M.D's license?
NPPES lists California license number A113176, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jonathan David Ou, M.D prescribe under Medicare Part D?
In 2024, Jonathan David Ou, M.D had 4,509 Medicare Part D claims for 396 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.