Quick answers
- Which hospitals does Andrew Zhang work at?
- Medicare's official clinician data lists Andrew Zhang at 1 hospital: Memorialcare Saddleback Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Andrew Zhang see patients?
- Medicare's clinician data lists 3 practice locations, including Laguna Woods, CA, Roseville, CA and Costa Mesa, CA. Call before your visit to confirm the address.
- What is Andrew Zhang's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Andrew Zhang accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew Zhang 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 Andrew Zhang?
- (657) 241-8455, as listed in official Medicare / NPI Registry data.
- What is Andrew Zhang's NPI number?
- 1821417627. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Andrew Zhang works
Medicare's Facility Affiliation Data lists Andrew Zhang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · CCN 050603
Practice locations
Addresses where Andrew Zhang is enrolled with Medicare (CMS data updated 2026-10-02).
- 24268 El Toro RdLaguna Woods, CA 92637 (657) 241‑8455
- 504 Gibson DrRoseville, CA 95678 (916) 771‑2871
- 722 Baker StCosta Mesa, CA 92626 (714) 557‑6300
Group practices
Medicare enrollment lists Andrew Zhang as a member of these groups (CMS data updated 2026-10-02).
- Permanente Medical Group Inc10,996 clinicians in the group
- Memorialcare Medical Foundation566 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821417627 |
| 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