Quick answers
- Which hospitals does John H. Nguyen work at?
- Medicare's official clinician data lists John H. Nguyen at 5 hospitals: Kaiser Foundation Hospital - Downey, Kaiser Foundation Hospital - Los Angeles, Kaiser Foundation Hospital - West LA, Kaiser Foundation Hospital - Woodland Hills and Kaiser Foundation Hospital Fontana/Ontario. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John H. Nguyen see patients?
- Medicare's clinician data lists 22 practice locations, including Baldwin Park, CA, Riverside, CA and San Dimas, CA. Call before your visit to confirm the address.
- What is John H. Nguyen's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does John H. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says John H. Nguyen 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 John H. Nguyen?
- (626) 851-1011, as listed in official Medicare / NPI Registry data.
- What is John H. Nguyen's NPI number?
- 1659448538. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John H. Nguyen works
Medicare's Facility Affiliation Data lists John H. Nguyen 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 - DowneyDowney, CA · Acute Care Hospital · CCN 050139
- Kaiser Foundation Hospital - Los AngelesLos Angeles, CA · Acute Care Hospital · CCN 050138
- Kaiser Foundation Hospital - West LALos Angeles, CA · Acute Care Hospital · CCN 050561
- Kaiser Foundation Hospital - Woodland HillsWoodland Hills, CA · Acute Care Hospital · CCN 050677
- Kaiser Foundation Hospital Fontana/OntarioFontana, CA · Acute Care Hospital · CCN 050140
Practice locations
Addresses where John H. Nguyen is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 22; the Medicare profile lists all.
- 1011 Balwin Park BlvdBaldwin Park, CA 91706 (626) 851‑1011
- 10800 Magnolia AveRiverside, CA 92505 (951) 353‑2000
- 1255 W Arrow HwySan Dimas, CA 91773 (909) 394‑2526
- 13652 Cantara StPanorama City, CA 91402 (818) 375‑2000
- 25821 Vermont AveHarbor City, CA 90710 (310) 325‑5111
Group practices
Medicare enrollment lists John H. Nguyen as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Baldwin Park
Clinicians with the same Medicare primary specialty in Baldwin Park, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Kansas School Of Med (kc/wich/sal) |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659448538 |
| 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