Roger L. Ong, MD
Internal Medicine Physician · Harbor City, CA
Roger L. Ong, MD is an internal medicine physician with a practice address in Harbor City, California, and NPI 1881761799, issued on Nov 29, 2006. Check the license (California G80076, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Roger L. Ong
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G80076 CA
Self-reported in NPPES; status is on the state search - Practice location
- 25825 Vermont Ave, Harbor City, CA 90710
- Phone
- (310) 325-5111
- Enumerated
- Nov 29, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110128000879); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 25825 Vermont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Roger L. Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G80076Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% more Medicare Part D claims than the average internal medicine physician in 2024
5,504 Medicare Part D claims for 1,189 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. 158 claims were for opioids.
Most prescribed
- Atorvastatin Calcium430 claims
- Lisinopril277 claims
- Amlodipine Besylate263 claims
- Losartan Potassium230 claims
- Hydrochlorothiazide173 claims
- Levothyroxine Sodium171 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupHarbor City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Roger L. Ong among 17,696 internal medicine physician records in California
Roger L. Ong, MD 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
64 internal medicine physician records list a practice address in Harbor City
They are 64 of the 958 NPPES records with a practice address in Harbor City, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Harbor City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rafael AmaroHarbor City, CA 907101750475661
- Jennifer Armstrong, MDHarbor City, CA 907101578567178
- Sook Chung, M.D.Harbor City, CA 907101306824487
- Margaret David, MDHarbor City, CA 907101336216209
- William Fleury, MDHarbor City, CA 907101912078825
- Roger Hartman, MDHarbor City, CA 907101083781942
- Ryokei Imai, MDHarbor City, CA 907101003975608
- Veassa Johnson, M.DHarbor City, CA 907101346308756
Common questions
What is Roger L. Ong, MD's NPI number?
Roger L. Ong, MD's National Provider Identifier (NPI) is 1881761799, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Roger L. Ong, MD located?
The NPPES record lists a practice address at 25825 Vermont Ave, Harbor City, CA, 90710. Phone: (310) 325-5111. Providers update this record themselves, so call before visiting.
How can I verify Roger L. Ong, MD's license?
NPPES lists California license number G80076, 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 Roger L. Ong, MD prescribe under Medicare Part D?
In 2024, Roger L. Ong, MD had 5,504 Medicare Part D claims for 1,189 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.