Quick answers
- Which hospitals does Essam A. Mostafa work at?
- Medicare's official clinician data lists Essam A. Mostafa at 4 hospitals: Garden Grove Hospital & Medical Center, Huntington Beach Hospital, Memorialcare Orange Coast Medical Center and UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Essam A. Mostafa see patients?
- Medicare's clinician data lists 1 practice location in Fountain Valley, CA. Call before your visit to confirm the address.
- What is Essam A. Mostafa's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Essam A. Mostafa accept Medicare assignment?
- Yes. Medicare's clinician data says Essam A. Mostafa 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 Essam A. Mostafa?
- (714) 486-2586, as listed in official Medicare / NPI Registry data.
- What is Essam A. Mostafa's NPI number?
- 1316932270. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Essam A. Mostafa works
Medicare's Facility Affiliation Data lists Essam A. Mostafa at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Garden Grove Hospital & Medical CenterGarden Grove, CA · Acute Care Hospital · CCN 050230
- Huntington Beach HospitalHuntington Beach, CA · Acute Care Hospital · CCN 050526
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · CCN 050678
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where Essam A. Mostafa is enrolled with Medicare (CMS data updated 2026-10-02).
- 11100 Warner Ave, Suite 158Fountain Valley, CA 92708 (714) 486‑2586
Group practices
Medicare enrollment lists Essam A. Mostafa as a member of this group (CMS data updated 2026-10-02).
- Premier Nephrology of Orange County Inc3 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Fountain Valley
Clinicians with the same Medicare primary specialty in Fountain Valley, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316932270 |
| 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