James J. Ong, M.D.
Specialist · Tarzana, CA
James J. Ong, M.D. is a specialist with a practice address in Tarzana, California, and NPI 1912955980, issued on May 4, 2006. Check the license (California G70354, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- James J. Ong
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G70354 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18372 Clark St, Tarzana, CA 91356
- Phone
- (818) 342-5377
- Enumerated
- May 4, 2006
- Record last updated
- Aug 24, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 00G703540 CA
- Medicare enrollment
- Enrolled (PECOS I20040519000930); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 18372 Clark St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Larry Eisenberg, MDPediatric Gastroenterology Physician1043232960
- Rachel Goodman, M.S., R.D.Registered Dietitian1487082442
- Yehuda Handelsman, M.D.Endocrinology, Diabetes & Metabolism Physician1063453769
- Susan Lee, D.M.D., M.D.Oral and Maxillofacial Surgery (Dentist)1083775696
Verify James J. Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G70354Check 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 specialist in 2024
2,384 Medicare Part D claims for 349 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims.
Most prescribed
- Eliquis367 claims
- Entresto156 claims
- Xarelto141 claims
- Jardiance119 claims
- Metoprolol Tartrate115 claims
- Amiodarone Hcl112 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): 100 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: $4,423.74
140 payments; by number, the most common kind was food and beverage; the largest payer was Biosense Webster, Inc. The 5,844 providers of this specialty with any payment received $4,760.79 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.
James J. Ong among 5,749 specialist records in California
James J. Ong, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1989 · median 1989 among the 1,075 with a school on file
- Record last updated2012 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 specialist records list a practice address in Tarzana
They are 29 of the 2,122 NPPES records with a practice address in Tarzana, and 5,749 specialist records in California.
All 5,749 in California → Every provider in Tarzana → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Gil Bender, M.D.Tarzana, CA 913561821032202
- Alan Bricklin, M.D.Tarzana, CA 913561073539102
- Thomas Ence, M.D.Tarzana, CA 913561497779508
- George Fischmann, M.D.Tarzana, CA 913561437187176
- Paul Kasnitz, M.D.Tarzana, CA 913561477574580
- Kenneth Kleinman, M.D.Tarzana, CA 913561689605941
- Donald Litvak, M.D.Tarzana, CA 913561790704344
- Zahi Nassoura, MDTarzana, CA 913561417995622
Common questions
What is James J. Ong, M.D.'s NPI number?
James J. Ong, M.D.'s National Provider Identifier (NPI) is 1912955980, issued on May 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James J. Ong, M.D. located?
The NPPES record lists a practice address at 18372 Clark St, Tarzana, CA, 91356. Phone: (818) 342-5377. Providers update this record themselves, so call before visiting.
How can I verify James J. Ong, M.D.'s license?
NPPES lists California license number G70354, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does James J. Ong, M.D. prescribe under Medicare Part D?
In 2024, James J. Ong, M.D. had 2,384 Medicare Part D claims for 349 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is James J. Ong, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 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.