Geriatric Medicine Doctors (Internal Medicine) in California
Data updated monthly · Last refresh October 2026
534 Geriatric Medicine (Internal Medicine) providers practice in California, including 144 (27%) 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.
534providers
144telehealth
Los Angelestop city
Geriatric Medicine (Internal Medicine) by city in California
Choose a city to see providers there.
Geriatric Medicine (Internal 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. Laurence Silverstein, M.D.Tarzana, CA · $262 in drug and device payments (2025) · Telehealth ·
(818) 345-0601 Dr. Gilbert Bourjeily, M.D.Tehachapi, CA · No drug or device payments recorded (2025) ·
(661) 823-3000 Dr. Franck Juste, M.D.Temple City, CA · $137 in drug and device payments (2025) ·
(626) 287-6513 Dr. Abriella Demanes, MDTorrance, CA · $139 in drug and device payments (2025) ·
(310) 222-2345 Dr. Christopher Mayorga, DOTorrance, CA · No drug or device payments recorded (2025) ·
(424) 306-4446 Dr. Elaine Deemer, DOTorrance, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 325-9110 Dr. Kushi Mehrotra, MDTorrance, CA · No drug or device payments recorded (2025) ·
(310) 320-4130 Dr. Mailee Hess, MDTorrance, CA · No drug or device payments recorded (2025) ·
(310) 222-6532 Dr. Marcil Mamita, MDTorrance, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 530-6900 Dr. Alvin Chang, M.D.Tustin, CA · $1,526 in drug and device payments (2025) · Telehealth ·
(714) 352-5800 Dr. Amish Shah, D.O., M.P,H,Tustin, CA · No drug or device payments recorded (2025) ·
(714) 734-5500 Dr. Kathryn Amacher, DOVacaville, CA · No drug or device payments recorded (2025) ·
(707) 451-4111 Dr. Chandra Keebler Bloom, MDVallejo, CA · No drug or device payments recorded (2025) ·
(707) 438-5077 Dr. Merlyn Asuncion, M.D.Van Nuys, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 781-2796 Dr. Andrea Parmelee, M.D.Ventura, CA · $240 in drug and device payments (2025) · Telehealth ·
(805) 642-8107 Dr. Daryush Parsa, M.D.Ventura, CA · No drug or device payments recorded (2025) ·
(805) 653-1624 Dr. Lanyard Dial, M.D.Ventura, CA · $206 in drug and device payments (2025) ·
(805) 642-1608 Dr. Lukasz Iwanczyk, M.D.Ventura, CA · No drug or device payments recorded (2025) ·
(805) 667-2801 Dr. Rabe Alhurani, MDVictorville, CA · $110 in drug and device payments (2025) · Telehealth ·
(760) 241-8000 Dr. Irving Bloom, M.D.Vista, CA · No drug or device payments recorded (2025) ·
(760) 630-9095 Dr. Lucia Kim, MD, MPHWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 906-2000 Dr. Oliver Tsai, M.D.West Covina, CA · No drug or device payments recorded (2025) ·
(626) 962-3584 Dr. Allison Mays, M.D.West Hollywood, CA · No drug or device payments recorded (2025) · Telehealth ·
(877) 617-1251 Dr. Hiroshi GotandaWest Hollywood, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 423-4683 Dr. Sara Espinoza, M.D.West Hollywood, CA · No drug or device payments recorded (2025) ·
(310) 423-4683 Dr. Tammy Le, MDWest Hollywood, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 423-3277 Dr. Tu Nguyen, MDWest Hollywood, CA · No drug or device payments recorded (2025) ·
(310) 423-3277 Dr. Shyam Kolangara, MDWestlake Village, CA · No drug or device payments recorded (2025) · Telehealth ·
(805) 494-6920 Dr. Dat Duong, M.D.Westminster, CA · $2,348 in drug and device payments (2025) · Telehealth ·
(714) 893-1212 Dr. William Welsh, D.O.Whittier, CA · $1,548 in drug and device payments (2025) · Telehealth ·
(562) 945-9333 Dr. Peter Chuang, M.D.Woodland Hills, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 592-2400 Dr. Denise Rettenmaier, D.O.Yountville, CA · No drug or device payments recorded (2025) ·
(707) 944-4716 Dr. Edgar Calvelo, M.D.Yountville, CA · No drug or device payments recorded (2025) ·
(707) 944-4716 Dr. Sofia Peterson, M.D.Yucaipa, CA · No drug or device payments recorded (2025) ·
(909) 795-9747 Common questions
How many Geriatric Medicine (Internal Medicine) providers are in California?There are 534 Geriatric Medicine (Internal Medicine) providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Geriatric Medicine (Internal Medicine) providers in California offer telehealth?Yes. 144 of the 534 Geriatric Medicine (Internal Medicine) providers in California (about 27%) report offering telehealth services in CMS data.
Which cities in California have the most Geriatric Medicine (Internal Medicine) providers?Los Angeles (77), San Francisco (58), San Diego (38) have the highest concentration of Geriatric Medicine (Internal Medicine) providers in California.
How many Geriatric Medicine (Internal Medicine) providers in California received drug or device company payments?129 of 534 Geriatric Medicine (Internal Medicine) providers in California (24%) 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 Geriatric Medicine Doctors (Internal Medicine) in California work in independent practices or large health systems?Among 266 Geriatric Medicine Doctors (Internal Medicine) in California enrolled in Medicare, 30% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 58% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Geriatric Medicine Doctors (Internal Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Geriatric Medicine Doctors (Internal Medicine) hold privileges are Ronald Reagan UCLA Medical Center in Los Angeles; Santa Monica - UCLA Med Ctr & Orthopaedic Hospital in Santa Monica; UCSF Medical Center in San Francisco.
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