Quick answers
- Where does William W. Tseng see patients?
- Medicare's clinician data lists 1 practice location in South Pasadena, CA. Call before your visit to confirm the address.
- What is William W. Tseng's specialty?
- Medicare lists Surgical Oncology as the primary specialty, and also General Surgery.
- Does William W. Tseng accept Medicare assignment?
- Yes. Medicare's clinician data says William W. Tseng 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.
- Does William W. Tseng offer telehealth?
- Medicare's clinician data says William W. Tseng offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William W. Tseng?
- (626) 396-2900, as listed in official Medicare / NPI Registry data.
- What is William W. Tseng's NPI number?
- 1417071242. 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 W. Tseng is enrolled with Medicare (CMS data updated 2026-10-02).
- 209 Fair Oaks AveSouth Pasadena, CA 91030 (626) 396‑2900
Group practices
Medicare enrollment lists William W. Tseng as a member of this group (CMS data updated 2026-10-02).
- City of Hope Medical Foundation982 clinicians in the group
Specialties
- Surgical Oncologyprimary
- General Surgeryalso
Other surgical oncologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1417071242 |
| 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