Quick answers
- Which hospitals does John M. Gilbert work at?
- Medicare's official clinician data lists John M. Gilbert at 2 hospitals: Providence St. Jude Medical Center and UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John M. Gilbert see patients?
- Medicare's clinician data lists 6 practice locations, including Fullerton, CA, Diamond Bar, CA and Anaheim, CA. Call before your visit to confirm the address.
- What is John M. Gilbert's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Internal Medicine.
- Does John M. Gilbert accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Gilbert 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 John M. Gilbert offer telehealth?
- Medicare's clinician data says John M. Gilbert offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John M. Gilbert?
- (714) 871-3006, as listed in official Medicare / NPI Registry data.
- What is John M. Gilbert's NPI number?
- 1588650667. 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 M. Gilbert works
Medicare's Facility Affiliation Data lists John M. Gilbert at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · CCN 050168
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where John M. Gilbert is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 100 E Valencia Mesa Dr, Suite 105Fullerton, CA 92835 (714) 871‑3006
- 1514 Valley Vista DrDiamond Bar, CA 91765 (909) 860‑1144
- 1950 Sunny Crest Dr, Suite 2900Fullerton, CA 92835 (714) 992‑5350
- 200 W Ctr St PromenadeAnaheim, CA 92805
- 253 S Diamond Bar BlvdDiamond Bar, CA 91765 (909) 860‑1144
Group practices
Medicare enrollment lists John M. Gilbert as a member of this group (CMS data updated 2026-10-02).
- Providence Medical Foundation1,466 clinicians in the group
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in Fullerton
Clinicians with the same Medicare primary specialty in Fullerton, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1588650667 |
| 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