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
Choose a city to see providers there.
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. Roger Wang, M.D.Santa Ana, CA · No drug or device payments recorded (2025) ·
(714) 835-1818 Dr. Sarah Page, D.O.Santa Ana, CA · $83 in drug and device payments (2025) ·
(714) 967-4766 Dr. Joel Brandt, M.D.Santa Barbara, CA · No drug or device payments recorded (2025) ·
(805) 966-7159 Dr. Robert Mathis, M.D.Santa Barbara, CA · $113 in drug and device payments (2025) ·
(805) 569-7100 Dr. Anand Singh, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(510) 316-6805 Dr. Sharon Gehringer, PA-CSanta Cruz, CA · No drug or device payments recorded (2025) · Telehealth ·
(831) 454-2080 Dr. Darren Boyer, MDSanta Monica, CA · No drug or device payments recorded (2025) ·
(310) 359-6790 Dr. Dina Al-rabadiSanta Monica, CA · $101 in drug and device payments (2025) ·
(818) 423-4442 Dr. Terri Rock, M.D.Santa Monica, CA · $104 in drug and device payments (2025) ·
(310) 829-7625 Dr. Kevin Li, MDSanta Rosa, CA · $292 in drug and device payments (2025) ·
(707) 396-5151 Dr. Ryan Wei, MDSanta Rosa, CA · No drug or device payments recorded (2025) ·
(909) 896-8553 Dr. Peter Madill, M.D.Sebastopol, CA · No drug or device payments recorded (2025) ·
(707) 823-3312 Dr. Richard Powers, MDSebastopol, CA · No drug or device payments recorded (2025) ·
(707) 823-5341 Dr. Russell Elmer, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 938-6556 Dr. Jack Stclair, M.D.Sonora, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 743-7084 Dr. Bin Jiang, MD, PHDSouth San Francisco, CA · $34 in drug and device payments (2025) ·
(650) 742-2000 Dr. Davinder Jeet, FNPStevenson Ranch, CA · No drug or device payments recorded (2025) ·
(661) 494-2767 Dr. Keri Montgomery, NPSt. Helena, CA · $278 in drug and device payments (2025) · Telehealth ·
(707) 963-7200 Dr. Allison Bernardo, DOStockton, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 476-2000 Dr. Fong Lai, M.D.Stockton, CA · No drug or device payments recorded (2025) ·
(209) 944-6343 Dr. James Holmes, M.D.Stockton, CA · No drug or device payments recorded (2025) ·
(209) 466-8683 Dr. James Sepiol, M.D.Stockton, CA · No drug or device payments recorded (2025) ·
(209) 546-7767 Dr. Katherine Cadacio, M.D.Stockton, CA · No drug or device payments recorded (2025) ·
(209) 476-3484 Dr. Naju Dah, MDStockton, CA · No drug or device payments recorded (2025) ·
(209) 466-5888 Dr. Olga Roche, M.D.Susanville, CA · No drug or device payments recorded (2025) ·
(530) 257-2181 Dr. Sam Shiesha, MD, FAAFPTehachapi, CA · No drug or device payments recorded (2025) ·
(661) 335-2891 Dr. Anita Jackson, M.D.Temecula, CA · $594 in drug and device payments (2025) ·
(951) 694-4688 Dr. Ferozan KarimiTemecula, CA · No drug or device payments recorded (2025) ·
(866) 984-7483 Dr. Sandor Woren, D.O.Temple City, CA · No drug or device payments recorded (2025) ·
(818) 613-5357 Dr. Nathan WilliamsThermal, CA · No drug or device payments recorded (2025) ·
(800) 717-4476 Dr. Mary Pascasio, MDThousand Oaks, CA · No drug or device payments recorded (2025) · Telehealth ·
(888) 515-3500 Dr. Michele Ghaussy, M.D.Thousand Oaks, CA · No drug or device payments recorded (2025) ·
(805) 277-0789 Dr. Munira Husain, M.D.Thousand Oaks, CA · $117 in drug and device payments (2025) · Telehealth ·
(805) 495-6866 Dr. Harpreet Grewal, M.D.Tracy, CA · $773 in drug and device payments (2025) · Telehealth ·
(209) 835-4232 Dr. Jagdish Patel, M.D.Tracy, CA · $245 in drug and device payments (2025) · Telehealth ·
(209) 832-8984 Dr. Rina Ricci Syliangco, M.D.Tracy, CA · No drug or device payments recorded (2025) ·
(209) 839-3300 Dr. Ney Aung, M.DTulare, CA · No drug or device payments recorded (2025) ·
(559) 684-8703 Dr. Charles Chol Bae Kim, MDTustin, CA · No drug or device payments recorded (2025) ·
(714) 831-1112 Dr. Daniel Constandse, MD Dr. Soheil Samvatian, M.D.Tustin, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 665-9890 Dr. Richard Behymer, M.D.Twain Harte, CA · No drug or device payments recorded (2025) ·
(209) 583-0191 Dr. Mariela VentocillaTwentynine Palms, CA · No drug or device payments recorded (2025) ·
(916) 734-2356 Dr. Evita Joseph, MDUkiah, CA · No drug or device payments recorded (2025) ·
(707) 467-3123 Dr. Kimberley Hanneken, MDUkiah, CA · No drug or device payments recorded (2025) ·
(707) 463-7488 Dr. Isabel Tejeda, M.D.Union City, CA · No drug or device payments recorded (2025) ·
(510) 675-4668 Dr. Marie Agleham, MDUnion City, CA · No drug or device payments recorded (2025) ·
(510) 675-4010 Dr. Eliza Thornton, MDVacaville, CA · No drug or device payments recorded (2025) ·
(707) 451-0182 Dr. Anthony Noces, MDVallejo, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 651-1000 Dr. Kalpana Rao, M.D.Vallejo, CA · $103 in drug and device payments (2025) ·
(707) 554-4444 Dr. Laurena Dongmo FotsingVallejo, CA · $115 in drug and device payments (2025) ·
(707) 553-5509 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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