Thomas Toan Nguyen, MD
Internal Medicine Physician · San Luis Obispo, CA
Thomas Toan Nguyen, MD is an internal medicine physician with a practice address in San Luis Obispo, California, and NPI 1336272871, issued on Mar 13, 2007. Check the license (California A97300, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Toan Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A97300 CA
Self-reported in NPPES; status is on the state search - Practice location
- 892 Aerovista PL Ste 210, San Luis Obispo, CA 93401
- Phone
- (805) 549-8023
- Enumerated
- Mar 13, 2007
- Record last updated
- May 20, 2025
- Medicare enrollment
- Enrolled (PECOS I20071107000279); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 892 Aerovista PL Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Phoebe Chen, M.D.Internal Medicine Physician1528163870
- Hayley ClevelandInfectious Disease Physician1811428998
- Virginia Hernandez, M.D.Family Medicine Physician1477746816
- Marilyn McGowan, MDInternal Medicine Physician1417586835
- Deepa Ragesh Panikkath, MDRheumatology Physician1821436684
- Amanda ShrewsburyGenetic Counselor (M.S.)1013609718
Verify Thomas Toan Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A97300Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average internal medicine physician in 2024
8,998 Medicare Part D claims for 730 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. 149 claims were for opioids.
Most prescribed
- Atorvastatin Calcium607 claims
- Levothyroxine Sodium320 claims
- Amlodipine Besylate297 claims
- Metformin Hcl276 claims
- Valsartan269 claims
- Rosuvastatin Calcium238 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 practice group's MIPS final score for 2023 (Medicare payment program): 83.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $19.08
1 payment: food and beverage; the largest payer was Mylan Specialty L.P. 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
- The Regents OF The University OF CaliforniaSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
41 internal medicine physician records list a practice address in San Luis Obispo
They are 41 of the 3,403 NPPES records with a practice address in San Luis Obispo, and 17,696 internal medicine physician records in California.
All 41 in San Luis Obispo → All 17,696 in California → Every provider in San Luis Obispo →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Thomas Toan Nguyen, MD's NPI number?
Thomas Toan Nguyen, MD's National Provider Identifier (NPI) is 1336272871, issued on Mar 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Toan Nguyen, MD located?
The NPPES record lists a practice address at 892 Aerovista PL Ste 210, San Luis Obispo, CA, 93401. Phone: (805) 549-8023. Providers update this record themselves, so call before visiting.
How can I verify Thomas Toan Nguyen, MD's license?
NPPES lists California license number A97300, 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 Thomas Toan Nguyen, MD prescribe under Medicare Part D?
In 2024, Thomas Toan Nguyen, MD had 8,998 Medicare Part D claims for 730 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Thomas Toan Nguyen, MD's MIPS final score?
The 2023 MIPS final score is 83.6 of 100, reported for the practice group. 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.