Thomas Tsongming Hsu, MD
Internal Medicine Physician · Cupertino, CA
Thomas Tsongming Hsu, MD is an internal medicine physician with a practice address in Cupertino, California, and NPI 1134153372, issued on Jul 11, 2006. Check the license (California A41255, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Tsongming Hsu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A41255 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20395 Pacifica Dr, Cupertino, CA 95014
- Phone
- (408) 446-5353
- Enumerated
- Jul 11, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (408) 252-0431
- Medicaid ID
- 8145117 CA
- Medicare enrollment
- Enrolled (PECOS I20050124000986); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 20395 Pacifica Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Tsongming Hsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A41255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,879 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 6% of claims.
Most prescribed
- Losartan Potassium361 claims
- Amlodipine Besylate296 claims
- Simvastatin193 claims
- Metformin Hcl180 claims
- Atorvastatin Calcium134 claims
- Metoprolol Succinate116 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: $122.10
1 payment: 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.
12 internal medicine physician records list a practice address in Cupertino
They are 12 of the 945 NPPES records with a practice address in Cupertino, and 17,696 internal medicine physician records in California.
All 12 in Cupertino → All 17,696 in California → Every provider in Cupertino →
Other internal medicine physician records in California
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- 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 Tsongming Hsu, MD's NPI number?
Thomas Tsongming Hsu, MD's National Provider Identifier (NPI) is 1134153372, issued on Jul 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Tsongming Hsu, MD located?
The NPPES record lists a practice address at 20395 Pacifica Dr, Cupertino, CA, 95014. Phone: (408) 446-5353. Providers update this record themselves, so call before visiting.
How can I verify Thomas Tsongming Hsu, MD's license?
NPPES lists California license number A41255, 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 Tsongming Hsu, MD prescribe under Medicare Part D?
In 2024, Thomas Tsongming Hsu, MD had 2,879 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.