Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ronald J Rivera, MD

Individual provider Emergency Medical Services (Emergency Medicine) Physician · NPI 1558716233

Ronald J Rivera, MD practises Emergency Medicine in Orange, California. Graduated from University of California, Geffen School of Medicine in 2016, 10 years ago. Practices with Regents of the University Of, a 125-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
10
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2016
Specialties on file
2
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

333 City Blvd W Ste 640
Orange, CA 92868-5915
Phone: (714) 509-7664
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A169303 (CA)
Emergency Medical Services (Emergency Medicine) Physician Taxonomy 207PE0004X · Licence A169303 (CA)

Record details

NPI number1558716233
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 29, 2016
Last updated in NPPESNovember 30, 2020
Certification dateNovember 30, 2020

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 2016 (10 years in practice)
Group practice Regents Of The University Of — 125 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients226
Services billed 301 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Uci Health-Orange Hospital · Orange, CA

Colleagues at Regents of the University Of

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 125 clinicians in the practice; 12 are shown here.

Other providers in Orange