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. Samira Molaei, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-7297 Dr. Susan Wakerlin, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Timothy Parenteau, MD, PHD Dr. Andres Zimmermann, MDOceanside, CA · $110 in drug and device payments (2025) ·
(760) 639-1714 Dr. Eric Barco, MDOceanside, CA · $32 in drug and device payments (2025) ·
(760) 724-8411 Dr. Ilsong Chong, M.D.Oceanside, CA · $76 in drug and device payments (2025) ·
(760) 736-6767 Dr. Raymond Sims, M.D.Ojai, CA · No drug or device payments recorded (2025) ·
(805) 646-0167 Dr. Hedy Loa, MDOntario, CA · $468 in drug and device payments (2025) ·
(909) 482-4462 Dr. Angela Tan, MDOrange, CA · $8,668 in drug and device payments (2025) ·
(714) 456-6770 Dr. K.a. Manisha PereraOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 456-7007 Dr. Kassandra King, DOOrange, CA · No drug or device payments recorded (2025) ·
(714) 880-7812 Dr. Kenneth Tram, MDOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 838-8848 Dr. Mary Harward, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 532-4915 Dr. Robert Buster, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 639-2600 Dr. Shashidar Acharya, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 771-2800 Dr. Xaviour Walker, M.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 456-6576 Dr. Vinod Valiveti, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 256-7828 Dr. Emma Javier, MDPalm Desert, CA · $19 in drug and device payments (2025) ·
(760) 834-2600 Dr. Arthur Small, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(415) 601-7408 Dr. Gail Gullickson, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 943-5000 Dr. Heather Cousins, M DPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 849-0102 Dr. John Cesca, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Jon Fuller, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Joyce Tenover, MD, PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Malini Madanahalli, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-5650 Dr. Maria Kristina Gestuvo, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 853-4724 Dr. Peter Cheng, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-2977 Dr. Ravnit Bhatia, DOPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Sowmya Iyer, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 849-1984 Dr. Vj PeriyakoilPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Yusra Hussain, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 328-1676 Dr. Balasubrahmanyan Shantha, MDPanorama City, CA · $69 in drug and device payments (2025) ·
(818) 375-2000 Dr. Jocelyn Sumcad, M.D.Paramount, CA · $56 in drug and device payments (2025) ·
(562) 633-0976 Dr. Arbis Rojas, MDPasadena, CA · No drug or device payments recorded (2025) ·
(626) 584-1919 Dr. Jennifer Li, MDPasadena, CA · No drug or device payments recorded (2025) ·
(877) 608-0044 Dr. Linda Aoyama, M.D.Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 799-4193 Dr. Norman Chien, MDPasadena, CA · $492 in drug and device payments (2025) · Telehealth ·
(626) 229-9865 Dr. Stephen Henry, M.D.Pasadena, CA · $3,550 in drug and device payments (2025) ·
(626) 797-8800 Dr. Steven Doan, M.D.Pasadena, CA · $81 in drug and device payments (2025) ·
(626) 229-9865 Dr. Theresa WongPasadena, CA · No drug or device payments recorded (2025) ·
(626) 765-5636 Dr. Wallace Schwam, M.D.Pismo Beach, CA · No drug or device payments recorded (2025) ·
(805) 231-8699 Dr. Suprabha Jain, MDPleasant Hill, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 935-5425 Dr. Mark Sockell, MDPoint Reyers, CA · $22 in drug and device payments (2025) ·
(415) 663-1082 Dr. Sudhakar Kona, MDPomona, CA · No drug or device payments recorded (2025) ·
(909) 629-3062 Dr. Vanessa AwadPorterville, CA · No drug or device payments recorded (2025) ·
(403) 542-8318 Dr. Mohinderpal Thaper, MDPoway, CA · No drug or device payments recorded (2025) ·
(858) 385-1419 Dr. Deepak Thiagarajan, MDRancho Cucamonga, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 881-5994 Dr. Harvey Cohen, MDRancho Cucamonga, CA · $848 in drug and device payments (2025) · Telehealth ·
(909) 987-2528 Dr. Rupinder Mann, M D INCRancho Mirage, CA · $409 in drug and device payments (2025) · Telehealth ·
(760) 770-7600 Dr. Sara Azar, M.D.Rancho Mirage, CA · $29 in drug and device payments (2025) ·
(760) 346-5688 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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