Quick answers
- Which hospitals does Ray Zhang work at?
- Medicare's official clinician data lists Ray Zhang at 5 hospitals: Contra Costa Regional Medical Center, Good Samaritan Hospital, John Muir Medical Center - Concord Campus, John Muir Medical Center - Walnut Creek Campus and San Ramon Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ray Zhang see patients?
- Medicare's clinician data lists 3 practice locations, including Walnut Creek, CA and Honolulu, HI. Call before your visit to confirm the address.
- What is Ray Zhang's specialty?
- Medicare lists Nuclear Medicine as the primary specialty, and also Diagnostic Radiology.
- Does Ray Zhang accept Medicare assignment?
- Medicare's clinician data says Ray Zhang may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Ray Zhang?
- (925) 295-1545, as listed in official Medicare / NPI Registry data.
- What is Ray Zhang's NPI number?
- 1417418856. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ray Zhang works
Medicare's Facility Affiliation Data lists Ray Zhang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Contra Costa Regional Medical CenterMartinez, CA · Acute Care Hospital · CCN 050276
- Good Samaritan HospitalSan Jose, CA · Acute Care Hospital · CCN 050380
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · CCN 050689
Practice locations
Addresses where Ray Zhang is enrolled with Medicare (CMS data updated 2026-10-02).
- 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 295‑1545
- 1601 Ygnacio Vly RdWalnut Creek, CA 94596 (925) 939‑3000
- 500 Ala Moana Blvd, Suite 7 421Honolulu, HI 96813 (925) 296‑7150
Group practices
Medicare enrollment lists Ray Zhang as a member of these groups (CMS data updated 2026-10-02).
- Bay Imaging Consultants Medical Group Inc146 clinicians in the group
- John Muir Trauma Physicians Billing Service113 clinicians in the group
- John Muir Magnetic Imaging Center57 clinicians in the group
Specialties
- Nuclear Medicineprimary
- Diagnostic Radiologyalso
Other nuclear medicine doctors in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1417418856 |
| 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