Minh Quoc Nguyen, M.D.
Internal Medicine Physician · San Marcos, CA
Minh Quoc Nguyen, M.D. is an internal medicine physician with a practice address in San Marcos, California, and NPI 1154403640, issued on Oct 20, 2006. Check the license (California A89951, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Minh Quoc Nguyen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A89951 CA
Self-reported in NPPES; status is on the state search - Practice location
- 885 Orion Way, San Marcos, CA 92078
- Phone
- (619) 757-0141
- Enumerated
- Oct 20, 2006
- Record last updated
- Jan 7, 2025
- Medicare enrollment
- Enrolled (PECOS I20050622000616); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Minh Quoc Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A89951Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,458 Medicare Part D claims for 308 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 37 claims were for opioids.
Most prescribed
- Atorvastatin Calcium92 claims
- Amlodipine Besylate76 claims
- Losartan Potassium59 claims
- Rosuvastatin Calcium49 claims
- Metformin Hcl48 claims
- Furosemide47 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 3 group practices
- 24 ON Physicians OF California PCPorterville, CA
- Graybill Medical Group IncEscondido, CA
- Hospitalist Medicine Physicians OF California IncOceanside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Minh Quoc Nguyen among 17,696 internal medicine physician records in California
Minh Quoc 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
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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 San Marcos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Meenu Bawa, M.DSan Marcos, CA 920781154598571
- Justin Charles, MDSan Marcos, CA 920781811552771
- Lauren Clarine, D.O.San Marcos, CA 920781669738928
- Joseph Czvik, MDSan Marcos, CA 920781528084340
- Sze Hoay Ding, M.D.San Marcos, CA 920781023239035
- Kathryn Germeraad, DOSan Marcos, CA 920781649830498
- Francisco Marquez, M.D.San Marcos, CA 920781316190747
- Tyler Sprague, D.O.San Marcos, CA 920781881077428
Common questions
What is Minh Quoc Nguyen, M.D.'s NPI number?
Minh Quoc Nguyen, M.D.'s National Provider Identifier (NPI) is 1154403640, issued on Oct 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Minh Quoc Nguyen, M.D. located?
The NPPES record lists a practice address at 885 Orion Way, San Marcos, CA, 92078. Phone: (619) 757-0141. Providers update this record themselves, so call before visiting.
How can I verify Minh Quoc Nguyen, M.D.'s license?
NPPES lists California license number A89951, 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 Minh Quoc Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Minh Quoc Nguyen, M.D. had 1,458 Medicare Part D claims for 308 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.