Quick answers
- Which hospitals does Derek T. Leung work at?
- Medicare's official clinician data lists Derek T. Leung at 1 hospital: Kaiser Foundation Hospital Fontana/Ontario. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Derek T. Leung see patients?
- Medicare's clinician data lists 2 practice locations, including Ontario, CA and Fontana, CA. Call before your visit to confirm the address.
- What is Derek T. Leung's specialty?
- Medicare lists Hospitalist as the primary specialty, and also Internal Medicine.
- Does Derek T. Leung accept Medicare assignment?
- Yes. Medicare's clinician data says Derek T. Leung 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 Derek T. Leung?
- (909) 724-5000, as listed in official Medicare / NPI Registry data.
- What is Derek T. Leung's NPI number?
- 1336560481. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Derek T. Leung works
Medicare's Facility Affiliation Data lists Derek T. Leung 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 Fontana/OntarioFontana, CA · Acute Care Hospital · CCN 050140
Practice locations
Addresses where Derek T. Leung is enrolled with Medicare (CMS data updated 2026-10-02).
- 2295 S Vineyard AveOntario, CA 91761 (909) 724‑5000
- 9961 Sierra AveFontana, CA 92335 (909) 427‑5000
Group practices
Medicare enrollment lists Derek T. Leung as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Hospitalistprimary
- Internal Medicinealso
Other hospitalists in Ontario
Clinicians with the same Medicare primary specialty in Ontario, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336560481 |
| 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