Quick answers
- Which hospitals does William Chen work at?
- Medicare's official clinician data lists William Chen at 1 hospital: Kaiser Foundation Hospital - Orange County - Anaheim. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Chen see patients?
- Medicare's clinician data lists 4 practice locations, including Anaheim, CA and Irvine, CA. Call before your visit to confirm the address.
- What is William Chen's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does William Chen accept Medicare assignment?
- Yes. Medicare's clinician data says William Chen 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 William Chen?
- (714) 279-6088, as listed in official Medicare / NPI Registry data.
- What is William Chen's NPI number?
- 1881659142. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Chen works
Medicare's Facility Affiliation Data lists William Chen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital - Orange County - AnaheimAnaheim, CA · Acute Care Hospital · CCN 050609
Practice locations
Addresses where William Chen is enrolled with Medicare (CMS data updated 2026-10-02).
- 5475 E La Palma AveAnaheim, CA 92807 (714) 279‑6088
- 6640 Alton PkwyIrvine, CA 92618 (949) 932‑5000
- 6650 Alton PkwyIrvine, CA 92618 (949) 932‑5000
- 6670 Alton PkwyIrvine, CA 92618 (949) 932‑5000
Group practices
Medicare enrollment lists William Chen as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Anaheim
Clinicians with the same Medicare primary specialty in Anaheim, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Southern California Keck School Of Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881659142 |
| 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