Quick answers
- Which hospitals does Jonathan B. Hornstein work at?
- Medicare's official clinician data lists Jonathan B. Hornstein at 3 hospitals: Banner del E. Webb Medical Center, UCI Health-Lakewood and UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan B. Hornstein see patients?
- Medicare's clinician data lists 4 practice locations, including Sun City, AZ, Garden Grove, CA and Fountain Valley, CA. Call before your visit to confirm the address.
- What is Jonathan B. Hornstein's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Jonathan B. Hornstein accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan B. Hornstein 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 Jonathan B. Hornstein?
- (623) 832-4000, as listed in official Medicare / NPI Registry data.
- What is Jonathan B. Hornstein's NPI number?
- 1144254723. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan B. Hornstein works
Medicare's Facility Affiliation Data lists Jonathan B. Hornstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Banner del E. Webb Medical CenterSun City West, AZ · Acute Care Hospital · CCN 030093
- UCI Health-LakewoodLakewood, CA · Acute Care Hospital · CCN 050581
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where Jonathan B. Hornstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 10401 W Thunderbird BlvdSun City, AZ 85351 (623) 832‑4000
- 12601 Garden Grove BlvdGarden Grove, CA 92843 (714) 537‑5160
- 14502 W Meeker BlvdSun City, AZ 85375 (623) 214‑4000
- 9920 Talbert AveFountain Valley, CA 92708 (714) 378‑7000
Group practices
Medicare enrollment lists Jonathan B. Hornstein as a member of these groups (CMS data updated 2026-10-02).
- Cep America - California1,292 clinicians in the group
- Cep America- Arizona, PC93 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Sun City
Clinicians with the same Medicare primary specialty in Sun City, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144254723 |
| 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