Quick answers
- Which hospitals does Willy W. Tjong work at?
- Medicare's official clinician data lists Willy W. Tjong at 5 hospitals: Dominican Hospital, Sequoia Hospital, UCSF Health Saint Francis Hospital, UCSF Health St. Mary's Hospital and UCSF Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Willy W. Tjong see patients?
- Medicare's clinician data lists 6 practice locations, including Santa Cruz, CA, Folsom, CA and San Francisco, CA. Call before your visit to confirm the address.
- What is Willy W. Tjong's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Willy W. Tjong accept Medicare assignment?
- Yes. Medicare's clinician data says Willy W. Tjong 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 Willy W. Tjong?
- (916) 351-4800, as listed in official Medicare / NPI Registry data.
- What is Willy W. Tjong's NPI number?
- 1831544196. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Willy W. Tjong works
Medicare's Facility Affiliation Data lists Willy W. Tjong at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Dominican HospitalSanta Cruz, CA · Acute Care Hospital · CCN 050242
- Sequoia HospitalRedwood City, CA · Acute Care Hospital · CCN 050197
- UCSF Health Saint Francis HospitalSan Francisco, CA · Acute Care Hospital · CCN 050152
- UCSF Health St. Mary's HospitalSan Francisco, CA · Acute Care Hospital · CCN 050457
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
Practice locations
Addresses where Willy W. Tjong is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1595 Soquel DrSanta Cruz, CA 95065
- 1700 Prairie City RdFolsom, CA 95630 (916) 351‑4800
- 1730 Prairie City Rd, Suite 120Folsom, CA 95630 (916) 351‑4800
- 2018 Mission StSanta Cruz, CA 95060 (831) 465‑7761
- 450 Stanyan StSan Francisco, CA 94117 (415) 750‑5770
Group practices
Medicare enrollment lists Willy W. Tjong as a member of these groups (CMS data updated 2026-10-02).
- Dignity Health Medical Foundation1,184 clinicians in the group
- Image Guided Therapeutics Inc15 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Santa Cruz
Clinicians with the same Medicare primary specialty in Santa Cruz, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of Ny Upstate Medical University |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831544196 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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