Emergency Medicine Providers in Irvine, CA
Browse 18 Emergency Medicine providers listed in NPPES with a practice address in Irvine, California.
How Irvine compares with the U.S.
Irvine has 5.8 clinicians in Emergency Medicine per 100,000 residents, about 27% of the U.S. rate of 21.
That is 18 active clinicians in Emergency Medicine with a practice address in Irvine, for a population of 311,690.
The California rate is 20 per 100,000 residents.
What these numbers mean
Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.
A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.
City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places.
100% of clinicians in Emergency Medicine in Irvine listed in the CMS Medicare file (14 of 14) accept Medicare assignment. That is similar to the California share of 97%.
What is Medicare assignment?
A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.
Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.
7% of clinicians in Emergency Medicine in Irvine listed in the CMS Medicare file (1 of 14) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the California share of 5%.
About the telehealth indicator
The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.
These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.
Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com · Methodology
Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).
Emergency Medicine Medicare (PECOS) Enrollment & Ordering Eligibility
Medicare enrollment and order/referring eligibility listed by CMS for Emergency Medicine practitioners in Irvine, CA
Dr. Nicholas Bove , MD
Emergency Medicine
Dr. Ahmed Aly Elrefaie , MD
Emergency Medicine
Dr. Stephen Tekchee Gau , MD
Emergency Medicine
Dr. Thomas Aaron Grotsky , MD
Emergency Medicine
Dr. Ryan Christopher Hurd , MD
Emergency Medicine
Dr. Ethan Kunstadt , MD
Emergency Medicine
Dr. Brian Edward Laakaniemi , MD
Emergency Medicine
Cong T Ly
Emergency Medicine
Dr. Cassondra Nigg Majestic , MD
Emergency Medicine
Dr. Amanda Darlene Moy , MD
Emergency Medicine
Dr. Peter Thanhtung Nguyen , DO
Emergency Medicine
Dr. Tara O'connell , MD
Emergency Medicine
Dr. Karin Elizabeth Reed , MD
Emergency Medicine
Dr. Joshua Timothy Romanu , MD
Emergency Medicine
Dr. Keith Joseph Rosing , MD
Emergency Medicine
Dr. James M. Shen , MD
Emergency Medicine
Vinh Tonthat
Emergency Medicine
Joseph Torres
Emergency Medicine
Frequently Asked Questions about Emergency Medicine in Irvine
Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.
This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.
Other Specialties in Irvine
- Pharmacist 284
- Physical Therapist 264
- Dentist - General Practice 178
- Dentist 153
- Nurse Practitioner - Family 152
- Social Worker - Clinical 144
- Psychologist - Clinical 140
- Chiropractor 136
- Physician Assistant 120
- Occupational Therapist 107
- Student in an Organized Health Care Education/Training Program 90
- Optometrist 84
Emergency Medicine Providers in Other California Cities
Cities with the most listed practitioners first.