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. John Leonard, M.DWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. John Rossi, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Joshua Lee, M.D.Walnut Creek, CA · $163 in drug and device payments (2025) ·
(925) 295-4000 Dr. Joy Li, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4070 Dr. Julia Yip, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Karl NimtzWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Kathryn HenryWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Lauren Cooke, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 375-9886 Dr. Lauren Klingman, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 813-6880 Dr. Lisa Low, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Louis Verre, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Maisie Mok, D.O.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Malcolm Johnson, MDWalnut Creek, CA · $117 in drug and device payments (2025) ·
(925) 939-3000 Dr. Margaret MahaffaWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Marianna Oppenheimer, MD, MSCWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mark Provda, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mark Slomoff, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. Mary Fox, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Meredith Waldon, MBBSWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 519-3945 Dr. Michael Katz, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Michael Lozano, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Michael Lucas, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Michael Overfield, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Michael Torrest, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Nirav Shah, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Patrick Shipsey, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 225-5837 Dr. Paul Freitas, M.D.Walnut Creek, CA · $77 in drug and device payments (2025) ·
(925) 939-3000 Dr. Peter Ackerman, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 295-4000 Dr. Peter Barnett, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 225-5837 Dr. Peter Benson, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 895-2519 Dr. Robert Koshlap, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Robert Mittendorff, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(650) 704-1639 Dr. Robert Mooney, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Robert Weingarten, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Samantha Chin, M.DWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 272-8624 Dr. Sandra Saunders, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 225-5837 Dr. Sara Larkin, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(734) 904-0942 Dr. Scott Chamberlain, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 225-5837 Dr. Scott Guyon, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Sean Bouvet, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-6723 Dr. Stephanie Carlson, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Steven Hui, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Susan Fitzgerald, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Theodore Kloth, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. Theophile Koury, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. Timothy Drazek, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. Wendy Palacios, WENDY PALACIOSWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Wilfred Rico, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(310) 722-4480 Dr. William Mills, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 939-3000 Dr. Yalina Disla, MD, MPHWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 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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