Quick answers
- Which hospitals does Warren Chang work at?
- Medicare's official clinician data lists Warren Chang at 5 hospitals: AHMC Seton Medical Center, California Pacific Medical Center - Mission Bernal…, Peninsula Medical Center, 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 Warren Chang see patients?
- Medicare's clinician data lists 3 practice locations, including Daly City, CA and San Francisco, CA. Call before your visit to confirm the address.
- What is Warren Chang's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does Warren Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Warren Chang 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.
- Does Warren Chang offer telehealth?
- Medicare's clinician data says Warren Chang offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Warren Chang?
- (650) 755-4490, as listed in official Medicare / NPI Registry data.
- What is Warren Chang's NPI number?
- 1083674550. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Warren Chang works
Medicare's Facility Affiliation Data lists Warren Chang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- AHMC Seton Medical CenterDaly City, CA · Acute Care Hospital · CCN 050289
- California Pacific Medical Center - Mission Bernal…San Francisco, CA · Acute Care Hospital · CCN 050055
- Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · CCN 050007
- 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 Warren Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 1498 Southgate Ave, Suite 102Daly City, CA 94015 (650) 755‑4490
- 1520 Stockton StSan Francisco, CA 94133 (415) 391‑9686
- 2250 Hayes St, Suite 612San Francisco, CA 94117 (650) 755‑4490
Group practices
Medicare enrollment lists Warren Chang as a member of these groups (CMS data updated 2026-10-02).
- North East Medical Services143 clinicians in the group
- West Coast Kidney56 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Daly City
Clinicians with the same Medicare primary specialty in Daly City, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083674550 |
| 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