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Emergency Medicine Providers in Pasadena, CA

Browse 50 Emergency Medicine providers listed in NPPES with a practice address in Pasadena, California.

50 Healthcare Providers

How Pasadena compares with the U.S.

Pasadena has 37 clinicians in Emergency Medicine per 100,000 residents, about 1.7 times the U.S. rate of 21.

That is 50 active clinicians in Emergency Medicine with a practice address in Pasadena, for a population of 136,969.

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. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

100% of clinicians in Emergency Medicine in Pasadena listed in the CMS Medicare file (36 of 36) 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.

3% of clinicians in Emergency Medicine in Pasadena listed in the CMS Medicare file (1 of 36) 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 ยท 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 Pasadena, CA

Source: CMS PECOS
PECOS Enrolled Specialists 41 In Pasadena, CA
Part B Lab & Imaging Eligible 42 Diagnostic Referrals
DME Ordering Eligible 42 Durable Medical Equipment
Home Health Agency Referrals 42 HHA Ordering Eligible
Showing 1โ€“20 of 50 providers
With recent CMS data first, then Aโ€“Z

Dr. Betty S Ahn , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1902862089
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Dr. Roy S Antelyes , MD

Emergency Medicine

Active NPI Status
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1275648610
View Full Profile

Dr. Timothy Cross Ballard , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
401 S Fair Oaks Ave, Pasadena, CA 911052603
Phone: 6267952244
NPI Identifier 1710090816
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Dr. Charles Walter Bugg , MD, PhD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911256897
Phone: 6263975116
NPI Identifier 1144690777
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Christopher Y Cha

Emergency Medicine

Active NPI Status
393 E Walnut St, 3rd Floor, Pasadena, CA 911880001
Phone: 8885050043
NPI Identifier 1962664565
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Michelle Park Choi

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263975111
NPI Identifier 1992267504
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Dr. William M Coburn , DO

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263975106
NPI Identifier 1770698920
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Dr. Peter Wesley Corrigan , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1841305000
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Dr. Giancarlo Pasquale Dimassa , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
817 S Madison Ave, Pasadena, CA 911064404
Phone: 3107530885
NPI Identifier 1255370797
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Dr. Jorge Antonio Fernandez , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
393 E. Walnut Street, Pasadena, CA 911880001
Phone: 6264057966
NPI Identifier 1295778090
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Dr. Bradley K. Gerberich , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Emergency Department, Pasadena, CA 911053010
Phone: 8185859562
NPI Identifier 1790728277
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Dr. Robert Thomas Goldweber , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1851406029
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Dr. May Mei Graham , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1558597054
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Dr. Nicholas Withrow Greco , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263975112
NPI Identifier 1023325289
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Dr. William B Gregory , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1659337350
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Dr. Huma Khan , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
2079 Monte Vista St, Pasadena, CA 91107
Phone: 7142721055
NPI Identifier 1528367174
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Dr. Taline Ardaches Kilaghbian , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263973445
NPI Identifier 1699889212
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Dr. Steven Mark Kushel , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
1425 Lida St, Pasadena, CA 911031919
Phone: 6267449868
NPI Identifier 1831132745
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Dr. Mai K Lai , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
675 S Arroyo Pkwy Ste 320, Pasadena, CA 911053264
Phone: 6265779495
NPI Identifier 1841232717
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Dr. Victor Lei , MD

Emergency Medicine

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263975000
NPI Identifier 1477174258
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Frequently Asked Questions about Emergency Medicine in Pasadena

How do I check a Emergency Medicine practitioner's license?

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.

Why is a practitioner missing from this list?

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.