Robert Tri Nguyen, MD
Internal Medicine Physician · Oxnard, CA
Robert Tri Nguyen, MD is an internal medicine physician with a practice address in Oxnard, California, and NPI 1780775718, issued on Sep 27, 2006. Check the license (California A89952, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert Tri Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A89952 CA
Self-reported in NPPES; status is on the state search - Practice location
- 815 Cooper Road, Oxnard, CA 93030
- Phone
- (805) 487-9892
- Enumerated
- Sep 27, 2006
- Record last updated
- Jan 31, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (805) 487-7590
- Medicare enrollment
- Enrolled (PECOS I20090226000027); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Robert Tri Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A89952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,049 Medicare Part D claims for 285 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 53 claims were for opioids.
Most prescribed
- Metoprolol Succinate73 claims
- Pantoprazole Sodium50 claims
- Furosemide45 claims
- Amlodipine Besylate42 claims
- Losartan Potassium42 claims
- Hydrocodone-Acetaminophen41 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: $428.44
6 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. 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
- Inpatient Specialists OF California PCOxnard, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Tri Nguyen among 17,696 internal medicine physician records in California
Robert Tri Nguyen, 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
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 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).
44 internal medicine physician records list a practice address in Oxnard
They are 44 of the 3,211 NPPES records with a practice address in Oxnard, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oxnard → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Avery, M.D.Oxnard, CA 930301891735486
- Richard Brand, MDOxnard, CA 930301770527608
- Dorothea Clayton, M.D.Oxnard, CA 930301053596395
- Romany Demian, M.D.Oxnard, CA 930301043232085
- Shiu Man Lee, M.D.Oxnard, CA 930301144397555
- Bernard McDermott, D.O.Oxnard, CA 930301821101841
- Myo Min, M.DOxnard, CA 930301407176670
- Richard Nguyen, M.D.Oxnard, CA 930301699960708
Common questions
What is Robert Tri Nguyen, MD's NPI number?
Robert Tri Nguyen, MD's National Provider Identifier (NPI) is 1780775718, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Tri Nguyen, MD located?
The NPPES record lists a practice address at 815 Cooper Road, Oxnard, CA, 93030. Phone: (805) 487-9892. Providers update this record themselves, so call before visiting.
How can I verify Robert Tri Nguyen, MD's license?
NPPES lists California license number A89952, 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 Robert Tri Nguyen, MD prescribe under Medicare Part D?
In 2024, Robert Tri Nguyen, MD had 1,049 Medicare Part D claims for 285 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.