Thuyvan Lam Nguyen, D.O.
Internal Medicine Physician · Riverside, CA
Thuyvan Lam Nguyen, D.O. is an internal medicine physician with a practice address in Riverside, California, and NPI 1275859233, issued on Apr 15, 2010. Check the license (California 20A11905, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thuyvan Lam Nguyen
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A11905 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2799 Gateway Dr Ste 100, Riverside, CA 92507
- Phone
- (833) 450-5967
- Enumerated
- Apr 15, 2010
- Record last updated
- Jul 29, 2026
- Fax
- (833) 450-5967
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2799 Gateway Dr Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Felipe Cendejas, PA-CMedical Physician Assistant1093149783
- Geia Davis, NP-CFamily Nurse Practitioner1629720578
- Madhu Francy, NPFamily Nurse Practitioner1922588540
Verify Thuyvan Lam Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A11905Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
497 Medicare Part D claims for 72 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Amlodipine Besylate34 claims
- Omeprazole34 claims
- Atorvastatin Calcium29 claims
- Metoprolol Tartrate24 claims
- Finasteride16 claims
- Tamsulosin Hcl16 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.
Thuyvan Lam Nguyen among 17,696 internal medicine physician records in California
Thuyvan Lam Nguyen, D.O. 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 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).
187 internal medicine physician records list a practice address in Riverside
They are 187 of the 13,893 NPPES records with a practice address in Riverside, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Riverside → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ronald Dulos, MDRiverside, CA 925071821063710
- Douglas Eaton, MDRiverside, CA 925071326023359
- Uju Ezeamama, MD, MSNRiverside, CA 925071316462724
- Kajal Gupta, M.DRiverside, CA 925071154461010
- Daniel Pearce, D.O.Riverside, CA 925071376635383
- Nikita Shah, DORiverside, CA 925071407485402
- Margaret Song, MDRiverside, CA 925071104074814
- Christopher Swanson, M.D.Riverside, CA 925071023016847
Common questions
What is Thuyvan Lam Nguyen, D.O.'s NPI number?
Thuyvan Lam Nguyen, D.O.'s National Provider Identifier (NPI) is 1275859233, issued on Apr 15, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Thuyvan Lam Nguyen, D.O. located?
The NPPES record lists a practice address at 2799 Gateway Dr Ste 100, Riverside, CA, 92507. Phone: (833) 450-5967. Providers update this record themselves, so call before visiting.
How can I verify Thuyvan Lam Nguyen, D.O.'s license?
NPPES lists California license number 20A11905, 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 Thuyvan Lam Nguyen, D.O. prescribe under Medicare Part D?
In 2024, Thuyvan Lam Nguyen, D.O. had 497 Medicare Part D claims for 72 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.