Oliver Lim Ong, M.D.
Endocrinology, Diabetes & Metabolism Physician · Glendale, CA
Oliver Lim Ong, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Glendale, California, and NPI 1811951734, issued on Apr 17, 2006. Check the license (California A76526, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Oliver Lim Ong
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- A76526 CA
Self-reported in NPPES; status is on the state search - Practice location
- 801 S Chevy Chase Dr, Glendale, CA 91205
- Phone
- (818) 265-2242
- Enumerated
- Apr 17, 2006
- Record last updated
- Jul 11, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (818) 265-2241
- Medicare enrollment
- Enrolled (PECOS I20050126000371); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 801 S Chevy Chase Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Deepu Bindal, M.DFamily Medicine Physician1881013589
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Verify Oliver Lim Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A76526Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.1 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
10,703 Medicare Part D claims for 812 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Jardiance1,177 claims
- Levothyroxine Sodium1,086 claims
- Metformin Hcl1,058 claims
- Mounjaro651 claims
- Ozempic443 claims
- Lantus Solostar405 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.
The MIPS final score for 2023 (Medicare payment program): 97.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,397.87
117 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 5,661 providers of this specialty with any payment received $5,742.15 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
- Adventist Health Physicians NetworkSimi Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Oliver Lim Ong among 1,131 endocrinology, diabetes & metabolism physician records in California
Oliver Lim Ong, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1996 · median 2003 among the 779 with a school on file
- Record last updated2012 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Glendale → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Zarmen Israelian, M.D.Glendale, CA 912051417911314
- Eliana Berger, M.D.Glendale, CA 912041790975886
- Martin Montoro, M.D.Glendale, CA 912041841372497
- William Pullen, M.D.Glendale, CA 912031104977248
- Calvin Wu, M.D.Glendale, CA 912031659646891
- Leon Kujmanian, M.D.Glendale, CA 912021194827782
- Jhanna Nariyants, D.O.Glendale, CA 912081629163035
- Warren Lee, MD, MHSPasadena, CA 911071942696448
Common questions
What is Oliver Lim Ong, M.D.'s NPI number?
Oliver Lim Ong, M.D.'s National Provider Identifier (NPI) is 1811951734, issued on Apr 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Oliver Lim Ong, M.D. located?
The NPPES record lists a practice address at 801 S Chevy Chase Dr, Glendale, CA, 91205. Phone: (818) 265-2242. Providers update this record themselves, so call before visiting.
How can I verify Oliver Lim Ong, M.D.'s license?
NPPES lists California license number A76526, 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 Oliver Lim Ong, M.D. prescribe under Medicare Part D?
In 2024, Oliver Lim Ong, M.D. had 10,703 Medicare Part D claims for 812 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Oliver Lim Ong, M.D.'s MIPS final score?
The 2023 MIPS final score is 97.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.