William Vay Tsu, P.A
Physician Assistant · San Francisco, CA
William Vay Tsu, P.A is a physician assistant with a practice address in San Francisco, California, and NPI 1912256439, issued on Aug 29, 2012. Check the license with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Vay Tsu
- Credential
- P.A
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 326 32ND Ave Apt 4, San Francisco, CA 94121
- Phone
- (714) 614-1541
- Enumerated
- Aug 29, 2012
- Record last updated
- Dec 9, 2022
- Medicare enrollment
- Enrolled (PECOS I20140812001993); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Verify William Vay Tsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average physician assistant in 2024
248 Medicare Part D claims for 172 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Albuterol Sulfate Hfa29 claims
- Hydrocortisone14 claims
- Fluocinonide11 claims
- Fluticasone Propionate11 claims
- Omeprazole11 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: $137.01
1 payment: food and beverage; the largest payer was Abbvie Inc. The 64,719 providers of this specialty with any payment received $841.65 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
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Vay Tsu among 14,451 physician assistant records in California
William Vay Tsu, P.A is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 33% of them.
- NPI issued2012 · 33% of these records are older, 65% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2012 · median 2018 among the 7,214 with a school on file
- Record last updated2022 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physician Assistant providers in California
There are 14,451 physician assistant records in California.
All 14,451 in California → Every provider in San Francisco → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Barbara Fitterer, MPA PA-CSan Francisco, CA 941211477725737
- Ilana MurphySan Francisco, CA 941211265194005
- Paolo Reyes RendonSan Francisco, CA 941211457095259
- Joseph TragesserSan Francisco, CA 941211518614411
- David Adler, PA-CSan Francisco, CA 941221346992138
- Rose Marie Grainda, PA-CSan Francisco, CA 941221528253648
- Sabrina Han, PA-CSan Francisco, CA 941221679895015
- Winnie JiangSan Francisco, CA 941221831924810
Common questions
What is William Vay Tsu, P.A's NPI number?
William Vay Tsu, P.A's National Provider Identifier (NPI) is 1912256439, issued on Aug 29, 2012. An NPI identifies a provider in billing; it is not a license.
Where is William Vay Tsu, P.A located?
The NPPES record lists a practice address at 326 32ND Ave Apt 4, San Francisco, CA, 94121. Phone: (714) 614-1541. Providers update this record themselves, so call before visiting.
How can I verify William Vay Tsu, P.A's license?
Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does William Vay Tsu, P.A prescribe under Medicare Part D?
In 2024, William Vay Tsu, P.A had 248 Medicare Part D claims for 172 beneficiaries; the average among physician assistant prescribers was 830. 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.