Tan Michael Nguyen, MD
Internal Medicine Physician · Sunnyvale, CA
Tan Michael Nguyen, MD is an internal medicine physician with a practice address in Sunnyvale, California, and NPI 1003256843, issued on Jun 25, 2013. Check the license (California A140731, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tan Michael Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A140731 CA
Self-reported in NPPES; status is on the state search - Practice location
- 301 Old San Francisco RD, Sunnyvale, CA 94086
- Phone
- (408) 730-4360
- Enumerated
- Jun 25, 2013
- Record last updated
- Oct 10, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20161014001914); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 301 Old San Francisco RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Tan Michael Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A140731Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,445 Medicare Part D claims for 310 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 70 claims were for opioids.
Most prescribed
- Atorvastatin Calcium292 claims
- Losartan Potassium130 claims
- Amlodipine Besylate122 claims
- Tamsulosin Hcl75 claims
- Rosuvastatin Calcium62 claims
- Lisinopril60 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 one group practice
- Sutter Bay Medical FoundationSunnyvale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tan Michael Nguyen among 17,696 internal medicine physician records in California
Tan Michael 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 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2013 · median 2004 among the 11,065 with a school on file
- Record last updated2016 · 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).
48 internal medicine physician records list a practice address in Sunnyvale
They are 48 of the 1,690 NPPES records with a practice address in Sunnyvale, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sunnyvale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Priya Bhusri, M.D.Sunnyvale, CA 940861659386019
- Teresa Cheng, MDSunnyvale, CA 940861598772857
- Leon Cheng, MDSunnyvale, CA 940861104834407
- Peter Fay, MDSunnyvale, CA 940861154384337
- Anitha Gundupalli, MDSunnyvale, CA 940861568571206
- Grace Guo, MDSunnyvale, CA 940861902811375
- Jason Hwang, M.D.Sunnyvale, CA 940861669490926
- Quanjing Liu, MDSunnyvale, CA 940861760588834
Common questions
What is Tan Michael Nguyen, MD's NPI number?
Tan Michael Nguyen, MD's National Provider Identifier (NPI) is 1003256843, issued on Jun 25, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Tan Michael Nguyen, MD located?
The NPPES record lists a practice address at 301 Old San Francisco RD, Sunnyvale, CA, 94086. Phone: (408) 730-4360. Providers update this record themselves, so call before visiting.
How can I verify Tan Michael Nguyen, MD's license?
NPPES lists California license number A140731, 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 Tan Michael Nguyen, MD prescribe under Medicare Part D?
In 2024, Tan Michael Nguyen, MD had 2,445 Medicare Part D claims for 310 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.