Quick answers
- Which hospitals does Sergio J. Marquez work at?
- Medicare's official clinician data lists Sergio J. Marquez at 2 hospitals: Barstow Community Hospital and Palmdale Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sergio J. Marquez see patients?
- Medicare's clinician data lists 3 practice locations, including Murrieta, CA, Wildomar, CA and Barstow, CA. Call before your visit to confirm the address.
- What is Sergio J. Marquez's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Sergio J. Marquez accept Medicare assignment?
- Yes. Medicare's clinician data says Sergio J. Marquez 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 Sergio J. Marquez?
- (951) 696-6000, as listed in official Medicare / NPI Registry data.
- What is Sergio J. Marquez's NPI number?
- 1851967178. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sergio J. Marquez works
Medicare's Facility Affiliation Data lists Sergio J. Marquez at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barstow Community HospitalBarstow, CA · Acute Care Hospital · CCN 050298
- Palmdale Regional Medical CenterPalmdale, CA · Acute Care Hospital · CCN 050204
Practice locations
Addresses where Sergio J. Marquez is enrolled with Medicare (CMS data updated 2026-10-02).
- 25500 Medical Ctr DrMurrieta, CA 92562 (951) 696‑6000
- 36485 Inland Valley DrWildomar, CA 92595 (951) 677‑1111
- 820 E Mountain View StBarstow, CA 92311 (858) 863‑7382
Group practices
Medicare enrollment lists Sergio J. Marquez as a member of these groups (CMS data updated 2026-10-02).
- Em Alliance California Apc68 clinicians in the group
- Singh MD a Professional Medical19 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Murrieta
Clinicians with the same Medicare primary specialty in Murrieta, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851967178 |
| 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