Quick answers
- Which hospitals does Crystal Chang work at?
- Medicare's official clinician data lists Crystal Chang at 5 hospitals: Alta Bates Summit Medical Center, John Muir Medical Center - Concord Campus, John Muir Medical Center - Walnut Creek Campus, San Ramon Regional Medical Center and UCSF Health Saint Francis Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Crystal Chang see patients?
- Medicare's clinician data lists 5 practice locations, including Alamo, CA, Walnut Creek, CA and Honolulu, HI. Call before your visit to confirm the address.
- What is Crystal Chang's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Crystal Chang accept Medicare assignment?
- Medicare's clinician data says Crystal Chang 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 Crystal Chang?
- (925) 932-6330, as listed in official Medicare / NPI Registry data.
- What is Crystal Chang's NPI number?
- 1518253012. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Crystal Chang works
Medicare's Facility Affiliation Data lists Crystal Chang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · CCN 050043
- 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
- UCSF Health Saint Francis HospitalSan Francisco, CA · Acute Care Hospital · CCN 050152
Practice locations
Addresses where Crystal Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 1505 Saint Alphonsus WayAlamo, CA 94507 (925) 932‑6330
- 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 295‑1545
- 1601 Ygnacio Vly RdWalnut Creek, CA 94596 (925) 939‑3000
- 2637 Shadelands DrWalnut Creek, CA 94598
- 500 Ala Moana Blvd, Suite 7 421Honolulu, HI 96813 (925) 296‑7150
Group practices
Medicare enrollment lists Crystal Chang as a member of these groups (CMS data updated 2026-10-02).
- Bass Medical Group291 clinicians in the group
- 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
- Diagnostic Radiologyprimary
Other radiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1518253012 |
| 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