Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Sergio Jose Marquez, MD

Individual provider Emergency Medicine Physician · NPI 1851967178

Dr. Sergio Jose Marquez, MD is an Emergency Medicine in Loma Linda, California. Qualified in 2021, 5 years ago. Practices with Em Alliance California APC, a 70-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
5
Licensed in
CA
In the registry since
2021
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

11234 Anderson Street Gme Ofc Westerly Ste C
Loma Linda, CA 92354-2804
Phone: (909) 558-4085
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 820 E Mountain View St, Barstow, CA 92311-3004 — (858) 863-7382

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A198101 (CA)

Record details

NPI number1851967178
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 27, 2021
Last updated in NPPESOctober 3, 2025
Certification dateOctober 3, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2021 (5 years in practice)
Group practice Em Alliance California Apc — 70 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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