Thai Dinh Nguyen, M.D.
Internal Medicine Physician · Santa Ana, CA
Thai Dinh Nguyen, M.D. is an internal medicine physician with a practice address in Santa Ana, California, and NPI 1467547042, issued on Oct 3, 2006. Check the license (California A91024, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thai Dinh Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A91024 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5030 Westminster Ave, Santa Ana, CA 92703
- Phone
- (714) 775-8090
- Enumerated
- Oct 3, 2006
- Record last updated
- Jul 20, 2026
- Fax
- (657) 251-0494
- Medicare enrollment
- Enrolled (PECOS I20070409000568); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 5030 Westminster Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tam NguyenWomen's Health Nurse Practitioner1407562853
- Theresa Thanh Nguyen, M.D.Internal Medicine Physician1003893801
Verify Thai Dinh Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A91024Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average internal medicine physician in 2024
10,473 Medicare Part D claims for 699 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. 44 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,095 claims
- Amlodipine Besylate791 claims
- Metformin Hcl509 claims
- Tamsulosin Hcl317 claims
- Losartan Potassium288 claims
- Metoprolol Succinate264 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: $1,052.40
39 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. 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
- Family Choice Aco IncWestminster, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thai Dinh Nguyen among 17,696 internal medicine physician records in California
Thai Dinh Nguyen, M.D. 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
- Graduated2003 · median 2004 among the 11,065 with a school on file
- 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).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Ana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kelvin Mai, DOSanta Ana, CA 927031326072612
- Theresa Thanh Nguyen, M.D.Santa Ana, CA 927031003893801
- Archana Shah, MDSanta Ana, CA 927031508867136
- Robert Castro, DOSanta Ana, CA 927041285777813
- Iyad Houshan, M.D.Santa Ana, CA 927041497773287
- Wesam Houshan, MDSanta Ana, CA 927041356467112
- Ajay Meka, M.D.Santa Ana, CA 927041063527976
- Madhavi Mulye, M.D.Santa Ana, CA 927041205056470
Common questions
What is Thai Dinh Nguyen, M.D.'s NPI number?
Thai Dinh Nguyen, M.D.'s National Provider Identifier (NPI) is 1467547042, issued on Oct 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thai Dinh Nguyen, M.D. located?
The NPPES record lists a practice address at 5030 Westminster Ave, Santa Ana, CA, 92703. Phone: (714) 775-8090. Providers update this record themselves, so call before visiting.
How can I verify Thai Dinh Nguyen, M.D.'s license?
NPPES lists California license number A91024, 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 Thai Dinh Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Thai Dinh Nguyen, M.D. had 10,473 Medicare Part D claims for 699 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.