Adult Medicine Doctors in California
Data updated monthly · Last refresh October 2026
385 Adult Medicine providers practice in California, including 72 (19%) 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.
385providers
72telehealth
Los Angelestop city
Adult Medicine by city in California
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Adult 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. Maxime Rappaport, MDMission Hills, CA · No drug or device payments recorded (2025) ·
(818) 365-9531 Dr. Alina Haider, MDModesto, CA · $938 in drug and device payments (2025) · Telehealth ·
(209) 523-1884 Dr. Don Vincent Lopez, M.D.Modesto, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 557-1650 Dr. Lyn Raible, M.D.Modesto, CA · No drug or device payments recorded (2025) ·
(209) 576-3525 Dr. Rehana Hethumuni, D.O.Montebello, CA · $509 in drug and device payments (2025) ·
(626) 676-6038 Dr. Ronald Hoffman, M.D.Mountain View, CA · No drug or device payments recorded (2025) ·
(650) 967-1515 Dr. John Feeney, D.O.Murrieta, CA · $701 in drug and device payments (2025) ·
(951) 695-4688 Dr. Michael Curley, M.D.Murrieta, CA · $14 in drug and device payments (2025) ·
(951) 698-0440 Dr. Rajeev Sachdev, M.D.Napa, CA · No drug or device payments recorded (2025) ·
(707) 253-5336 Dr. Amarjit Sohi, M.D.Narco, CA · No drug or device payments recorded (2025) ·
(951) 273-2371 Dr. Emmett Miller, MDNevada City, CA · No drug or device payments recorded (2025) ·
(530) 478-1807 Dr. Andrew Le, MDNewport Beach, CA · No drug or device payments recorded (2025) ·
(949) 791-3001 Dr. Ashley BurbachNewport Beach, CA · $500 in drug and device payments (2025) ·
(949) 228-5632 Dr. Gilbert Fernando, M.D.Northridge, CA · No drug or device payments recorded (2025) ·
(818) 727-7073 Dr. Monika Lee, D.O.Northridge, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 993-4054 Dr. Sean Chen, MDNorthridge, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 886-4028 Dr. Thomas Conklin, M.D.Northridge, CA · $229 in drug and device payments (2025) · Telehealth ·
(818) 701-0551 Dr. Gail Altschuler, M.D.Novato, CA · No drug or device payments recorded (2025) ·
(415) 897-9800 Dr. Jonathan Delson, MDNovato, CA · No drug or device payments recorded (2025) ·
(415) 899-7412 Dr. Colleen O'neil-tennant, MDOakhurst, CA · No drug or device payments recorded (2025) ·
(559) 658-8388 Dr. Gordon Lake, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 419-0230 Dr. Grace Lat, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 567-5700 Dr. Jazmin WiseOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Paul Perchonock, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 655-7100 Dr. Jacobo Flores, M.DOceanside, CA · $31 in drug and device payments (2025) ·
(760) 754-5663 Dr. Sean Breen, D.O.Orance, CA · No drug or device payments recorded (2025) ·
(760) 500-7615 Dr. Jack Mossler, MDOrange, CA · No drug or device payments recorded (2025) ·
(171) 460-2626 Dr. Janja Viltuznik, M.D.Orange, CA · $1,540 in drug and device payments (2025) ·
(714) 538-6822 Dr. Maryann Nuesse, D.O.Orange, CA · No drug or device payments recorded (2025) ·
(714) 771-1420 Dr. William Nuesse, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 771-1420 Dr. Andrew Nangalama, MDOrangevale, CA · $21 in drug and device payments (2025) ·
(916) 621-2000 Dr. Andrew Degiorgio, M.D. Dr. Alexander Frid, D.OPalm Springs, CA · No drug or device payments recorded (2025) ·
(760) 325-6530 Dr. Frank Arian, M.D.Palm Springs, CA · No drug or device payments recorded (2025) ·
(760) 327-8755 Dr. Eugene Kim, MDPanorama City, CA · $188 in drug and device payments (2025) ·
(703) 362-2029 Dr. Jacquelyn Walker, M.D.Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 795-8495 Dr. Marianna Shakhnovits, M.D.Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 795-2244 Dr. Shabana Shah, MDPasadena, CA · No drug or device payments recorded (2025) ·
(310) 809-9103 Dr. Stephanie Nguyen, D.O.Patton, CA · No drug or device payments recorded (2025) ·
(909) 425-7679 Dr. Grant RichardsonPinole, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 243-4000 Dr. Mary Cerni, D.O.Placentia, CA · $125 in drug and device payments (2025) ·
(714) 529-5674 Dr. Justine Szekely, PAPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 621-7700 Dr. Patrick Knost, M.D.Placerville, CA · No drug or device payments recorded (2025) ·
(530) 295-3588 Dr. Zachary ErnstbergerPlaya Vista, CA · No drug or device payments recorded (2025) ·
(424) 315-2220 Common questions
How many Adult Medicine providers are in California?There are 385 Adult Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Adult Medicine providers in California offer telehealth?Yes. 72 of the 385 Adult Medicine providers in California (about 19%) report offering telehealth services in CMS data.
Which cities in California have the most Adult Medicine providers?Los Angeles (23), San Francisco (20), Sacramento (17) have the highest concentration of Adult Medicine providers in California.
How many Adult Medicine providers in California received drug or device company payments?116 of 385 Adult Medicine providers in California (30%) 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 Adult Medicine Doctors in California work in independent practices or large health systems?Among 180 Adult Medicine Doctors in California enrolled in Medicare, 36% bill through a solo or small practice with fewer than 10 clinicians, 9% through a mid-size group of 10 to 99, and 56% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Adult Medicine Doctors in California work at?According to CMS facility affiliation records, the California hospitals where the most Adult Medicine Doctors hold privileges are Hoag Memorial Hospital Presbyterian in Newport Beach; Northridge Hospital Medical Center in Northridge; Kaiser Foundation Hospital - Sacramento in Sacramento.
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