Wen-Yee Tsai, MD
Endocrinology, Diabetes & Metabolism Physician · Oakland, CA
Wen-Yee Tsai, MD is an endocrinology, diabetes & metabolism physician with a practice address in Oakland, California, and NPI 1952425803, issued on Mar 18, 2007. Check the license (California A112303, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Wen-Yee Tsai
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- A112303 CA
MD00048809 WA
Self-reported in NPPES; status is on the state search - Practice location
- 350 30TH St, Oakland, CA 94609
- Phone
- (510) 465-7600
- Enumerated
- Mar 18, 2007
- Record last updated
- Dec 21, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (510) 465-7765
- Medicare enrollment
- Enrolled (PECOS I20101103001217); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 350 30TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vanessa AuBone Densitometry Radiologic Technologist1972671725
- Christopher Bautista, M.D.Internal Medicine Physician1346539509
- Lori Beltran, D.O.Family Medicine Physician1053567768
- Alice Benham, NPFamily Nurse Practitioner1578611570
- Rachel Callaghan, M.D.Internal Medicine Physician1548239627
- Cyril Callister, PA-CMedical Physician Assistant1871518977
Verify Wen-Yee Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A112303Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
458 Medicare Part D claims for 158 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Methimazole158 claims
- Levothyroxine Sodium151 claims
- Hydrocortisone17 claims
- Calcitriol13 claims
- Humalog12 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
- Permanente Medical Group IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Wen-Yee Tsai among 1,131 endocrinology, diabetes & metabolism physician records in California
Wen-Yee Tsai, MD is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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 46% of them.
- NPI issued2007 · 46% of these records are older, 42% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2003 · median 2003 among the 779 with a school on file
- Record last updated2021 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Oakland → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Kristen Lavelle, MDOakland, CA 946091790273381
- Anna Shurter, M.D.Oakland, CA 946091649462516
- Grace Eng, MDEmeryville, CA 946081871552679
- Nithya Mani, M.D.Emeryville, CA 946081932426368
- Clare Moynihan, MDEmeryville, CA 946081023339413
- Elaine Wong, MDEmeryville, CA 946081932258258
- Audrey Arzamendi, M.D.Walnut Creek, CA 945981508159567
- Mark Christiansen, MDWalnut Creek, CA 945981821108218
Common questions
What is Wen-Yee Tsai, MD's NPI number?
Wen-Yee Tsai, MD's National Provider Identifier (NPI) is 1952425803, issued on Mar 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Wen-Yee Tsai, MD located?
The NPPES record lists a practice address at 350 30TH St, Oakland, CA, 94609. Phone: (510) 465-7600. Providers update this record themselves, so call before visiting.
How can I verify Wen-Yee Tsai, MD's license?
NPPES lists California license number A112303, 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 Wen-Yee Tsai, MD prescribe under Medicare Part D?
In 2024, Wen-Yee Tsai, MD had 458 Medicare Part D claims for 158 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.