Wendy Tseng, M.D., M.S.
Internal Medicine Physician · South San Francisco, CA
Wendy Tseng, M.D., M.S. is an internal medicine physician with a practice address in South San Francisco, California, and NPI 1609296680, issued on Apr 17, 2014. Check the license (California A148016, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Wendy Tseng
- Credential
- M.D., M.S.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A148016 CA
PG168262 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1200 EL Camino Real, South San Francisco, CA 94080
- Phone
- (650) 742-2000
- Enumerated
- Apr 17, 2014
- Record last updated
- Sep 2, 2022
- Medicare enrollment
- Enrolled (PECOS I20180220002365); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1200 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kate AlbeePhysical Therapist1053464495
- Jason Anderson, MDHospitalist Physician1831277466
- Karl Anderson, MDUrology Physician1700964301
Verify Wendy Tseng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A148016Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average internal medicine physician in 2024
751 Medicare Part D claims for 243 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Furosemide49 claims
- Omeprazole30 claims
- Pradaxa27 claims
- Atorvastatin Calcium23 claims
- Amlodipine Besylate22 claims
- Pantoprazole Sodium20 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
- Southern California Permanente Medical GroupWoodland Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Wendy Tseng among 17,696 internal medicine physician records in California
Wendy Tseng, M.D., M.S. 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 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2014 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 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).
63 internal medicine physician records list a practice address in South San Francisco
They are 63 of the 1,173 NPPES records with a practice address in South San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in South San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michelle Caughey, MDSouth San Francisco, CA 940801861570475
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- Stephen Howe, MDSouth San Francisco, CA 940801497833024
- Hulya Kaymaz, MDSouth San Francisco, CA 940801295813822
- Issa Khouri, MDSouth San Francisco, CA 940801285712885
- Grace Lay, DOSouth San Francisco, CA 940801629156211
- Timothy Liao, MDSouth San Francisco, CA 940801114005733
- Jae Park, MDSouth San Francisco, CA 940801477631075
Common questions
What is Wendy Tseng, M.D., M.S.'s NPI number?
Wendy Tseng, M.D., M.S.'s National Provider Identifier (NPI) is 1609296680, issued on Apr 17, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Wendy Tseng, M.D., M.S. located?
The NPPES record lists a practice address at 1200 EL Camino Real, South San Francisco, CA, 94080. Phone: (650) 742-2000. Providers update this record themselves, so call before visiting.
How can I verify Wendy Tseng, M.D., M.S.'s license?
NPPES lists California license number A148016, 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 Wendy Tseng, M.D., M.S. prescribe under Medicare Part D?
In 2024, Wendy Tseng, M.D., M.S. had 751 Medicare Part D claims for 243 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.