Tam Hoang Nguyen, D.O.
Internal Medicine Physician · San Jose, CA
Tam Hoang Nguyen, D.O. is an internal medicine physician with a practice address in San Jose, California, and NPI 1962520478, issued on Mar 26, 2007. Check the license (California 20A9636, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tam Hoang Nguyen
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A9636 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Jose Figueres Ave Ste 180, San Jose, CA 95116
- Phone
- (408) 258-5083
- Enumerated
- Mar 26, 2007
- Record last updated
- Sep 12, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (408) 258-4347
- Medicare enrollment
- Enrolled (PECOS I20070725000300); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 200 Jose Figueres Ave Ste 180
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Van Ly, FNP-CFamily Nurse Practitioner1790426781
Verify Tam Hoang Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9636Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11.2 times the Medicare Part D claims of the average internal medicine physician in 2024
35,628 Medicare Part D claims for 1,755 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 217 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,828 claims
- Losartan Potassium1,814 claims
- Baclofen1,197 claims
- Amlodipine Besylate1,176 claims
- Triamcinolone Acetonide1,134 claims
- Metoprolol Succinate950 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: $1,040.57
48 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. 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
- Action Therapy Centers LimitedHouston, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tam Hoang Nguyen among 17,696 internal medicine physician records in California
Tam Hoang 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2004 among the 11,065 with a school on file
- Record last updated2018 · 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).
428 internal medicine physician records list a practice address in San Jose
They are 428 of the 20,925 NPPES records with a practice address in San Jose, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Jose → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Komal Bhatt, MDSan Jose, CA 951161003824699
- Richard Cathey, M.D.San Jose, CA 951161750343323
- Dinh Dam, M.D.San Jose, CA 951161518936616
- Jaco Fishenfeld, MDSan Jose, CA 951161689639577
- Jose Maria Guanzon, MDSan Jose, CA 951161134150881
- Teresita Guanzon, MDSan Jose, CA 951161306877055
- Dwight Lim, MDSan Jose, CA 951161124084561
- Syed Majid, MD, FRCP, FASAMSan Jose, CA 951161225009533
Common questions
What is Tam Hoang Nguyen, D.O.'s NPI number?
Tam Hoang Nguyen, D.O.'s National Provider Identifier (NPI) is 1962520478, issued on Mar 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Tam Hoang Nguyen, D.O. located?
The NPPES record lists a practice address at 200 Jose Figueres Ave Ste 180, San Jose, CA, 95116. Phone: (408) 258-5083. Providers update this record themselves, so call before visiting.
How can I verify Tam Hoang Nguyen, D.O.'s license?
NPPES lists California license number 20A9636, 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 Tam Hoang Nguyen, D.O. prescribe under Medicare Part D?
In 2024, Tam Hoang Nguyen, D.O. had 35,628 Medicare Part D claims for 1,755 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.