Quick answers
- Where does William Tsu see patients?
- Medicare's clinician data lists 1 practice location in San Francisco, CA. Call before your visit to confirm the address.
- What is William Tsu's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does William Tsu accept Medicare assignment?
- Yes. Medicare's clinician data says William Tsu accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William Tsu?
- (415) 600-0140, as listed in official Medicare / NPI Registry data.
- What is William Tsu's NPI number?
- 1912256439. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William Tsu is enrolled with Medicare (CMS data updated 2026-10-02).
- 1100 Van Ness AveSan Francisco, CA 94109 (415) 600‑0140
Group practices
Medicare enrollment lists William Tsu as a member of this group (CMS data updated 2026-10-02).
- Sutter Bay Medical Foundation3,829 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1912256439 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians