Quick answers
- Where does William T. Tseng see patients?
- Medicare's clinician data lists 14 practice locations, including Oceanside, CA, El Cajon, CA and San Diego, CA. Call before your visit to confirm the address.
- What is William T. Tseng's specialty?
- Medicare lists Hospitalist as the primary specialty, and also Internal Medicine.
- Does William T. Tseng accept Medicare assignment?
- Yes. Medicare's clinician data says William T. 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.
- What is the phone number for William T. Tseng?
- (619) 516-6108, as listed in official Medicare / NPI Registry data.
- What is William T. Tseng's NPI number?
- 1093874752. 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 T. Tseng is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 14; the Medicare profile lists all.
- 1302 Rocky Point DrOceanside, CA 92056 (619) 516‑6108
- 1630 E Main StEl Cajon, CA 92021 (619) 528‑5000
- 17140 Bernardo Ctr DrSan Diego, CA 92128 (800) 290‑5000
- 3250 Fordham StSan Diego, CA 92110 (619) 528‑5000
- 3851 Shaw Ridge RdSan Diego, CA 92130 (619) 528‑5000
Group practices
Medicare enrollment lists William T. Tseng as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Hospitalistprimary
- Internal Medicinealso
Other hospitalists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Utah School Of Medicine |
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1093874752 |
| 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