Quick answers
- Which hospitals does John S. Gambol work at?
- Medicare's official clinician data lists John S. Gambol at 4 hospitals: Keck Hospital of USC, Providence St. Jude Medical Center, UCI Health-Orange and USC Verdugo Hills Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John S. Gambol see patients?
- Medicare's clinician data lists 3 practice locations, including Placentia, CA, Palmdale, CA and Canoga Park, CA. Call before your visit to confirm the address.
- What is John S. Gambol's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does John S. Gambol accept Medicare assignment?
- Yes. Medicare's clinician data says John S. Gambol 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 S. Gambol?
- (714) 985-9110, as listed in official Medicare / NPI Registry data.
- What is John S. Gambol's NPI number?
- 1255339826. 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 S. Gambol works
Medicare's Facility Affiliation Data lists John S. Gambol at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Keck Hospital of USCLos Angeles, CA · Acute Care Hospital · CCN 050696
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · CCN 050168
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
- USC Verdugo Hills HospitalGlendale, CA · Acute Care Hospital · CCN 050124
Practice locations
Addresses where John S. Gambol is enrolled with Medicare (CMS data updated 2026-10-02).
- 1041 E Yorba Linda Blvd, Suite 203Placentia, CA 92870 (714) 985‑9110
- 38660 Medical Ctr DrPalmdale, CA 93551 (661) 949‑6946
- 8565 Independence Ave, Apt 1Canoga Park, CA 91304 (818) 709‑8161
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Placentia
Clinicians with the same Medicare primary specialty in Placentia, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Miami, Lm Miller School Of Medicine |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255339826 |
| 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