Emergency Medicine Doctors in California
Data updated monthly · Last refresh October 2026
7,777 Emergency Medicine providers practice in California, including 234 (3%) offering telehealth. The largest concentration is in Los Angeles. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.
7,777providers
234telehealth
Los Angelestop city
Emergency Medicine by city in California
Choose a city to see providers there.
Emergency Medicine providers in California
Listed by city, largest first. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.
Dr. Jennifer Kanapicki, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Jennifer Newberry, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Jessica Ngo, M.D.Stanford, CA · $288 in drug and device payments (2025) ·
(650) 723-9215 Dr. Jessica Singh, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Jody Vogel, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. John Dayton, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. John Kendall, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. John Su, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Jonathan Vlahos, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Joseph Becker, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Joshua Hughes, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Joshua SteinStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Julie Widdison, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Kara Yeung, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Katherine Shea, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Kayla ShipleyStanford, CA · No drug or device payments recorded (2025) ·
(650) 725-9445 Dr. Kelly Roszczynialski, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Kenton Anderson, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Ken Zafren, MDStanford, CA · $9,000 in drug and device payments (2025) ·
(650) 723-0000 Dr. Kimberly Schertzer, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-0000 Dr. Kristin Fontes, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Laleh Gharahbaghian, MDStanford, CA · $3,150 in drug and device payments (2025) ·
(650) 723-4000 Dr. Larry Mo, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-0063 Dr. Leonardo Aliaga, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Linn Lung, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Luigi Di Stefano, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Maame Yaa Yiadom, MD, MPH, MSCIStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Maia Winkel, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Marc Berenson, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Marc Gautreau, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Margie Teng, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-9215 Dr. Martha Masters, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Mary Mercer, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Matthew Schoen, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Matthew Strehlow, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Megan Pendleton, MD, PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Michael Gisondi, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Michael Laufer, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6576 Dr. Michael Losak, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Michael Shaheen, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Michelle Feltes, MDStanford, CA · $324 in drug and device payments (2025) ·
(650) 723-4000 Dr. Michelle Lin, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Milana Boukhman, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Misha Kassel, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Moises Gallegos, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Monica Saxena, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Mostafa Abdel-hamid, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Nathaniel Coggins, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Nicholas Ashenburg, MDStanford, CA · $10,018 in drug and device payments (2025) ·
(650) 723-4000 Dr. Nicholas Lang, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Common questions
How many Emergency Medicine providers are in California?There are 7,777 Emergency Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Emergency Medicine providers in California offer telehealth?Yes. 234 of the 7,777 Emergency Medicine providers in California (about 3%) report offering telehealth services in CMS data.
Which cities in California have the most Emergency Medicine providers?Los Angeles (630), San Diego (496), Sacramento (371) have the highest concentration of Emergency Medicine providers in California.
How many Emergency Medicine providers in California received drug or device company payments?1,103 of 7,777 Emergency Medicine providers in California (14%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
Where does this data come from?Provider counts and profiles come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.
Do most Emergency Medicine Doctors in California work in independent practices or large health systems?Among 4,164 Emergency Medicine Doctors in California enrolled in Medicare, 7% bill through a solo or small practice with fewer than 10 clinicians, 27% through a mid-size group of 10 to 99, and 66% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Emergency Medicine Doctors in California work at?According to CMS facility affiliation records, the California hospitals where the most Emergency Medicine Doctors hold privileges are Uci Health-Orange in Orange; Stanford Health Care in Stanford; Kaiser Foundation Hospital - Oakland/Richmond in Oakland.
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