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.
Where Adult Medicine Doctors in California practice
From CMS Medicare enrollment records covering 180 of the 385 providers listed here (47%). Providers who do not bill Medicare are not included in these figures.
36%solo or small practice (under 10 clinicians)
9%mid-size group (10 to 99)
56%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Adult Medicine Doctors | All clinicians in group | Main city |
| Permanente Medical Group Inc. | 28 | 10,928 | Stockton |
| Southern California Permanente Medical Group | 20 | 11,250 | Anaheim |
| Healthcare Partners Affiliates Medical Group | 5 | 775 | Carson |
| Department of State Hospitals | 5 | 275 | Coalinga |
| County of Los Angeles | 4 | 395 | Bellflower |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Adult Medicine Doctors affiliated |
| Hoag Memorial Hospital Presbyterian | Newport Beach | Nonprofit | 5 of 5 | 4 |
| Northridge Hospital Medical Center | Northridge | Nonprofit | 4 of 5 | 4 |
| Kaiser Foundation Hospital - Sacramento | Sacramento | Nonprofit | 4 of 5 | 4 |
| Memorialcare Long Beach Medical Center | Long Beach | Nonprofit | 2 of 5 | 3 |
| Marinhealth Medical Center | Greenbrae | Government | 5 of 5 | 3 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
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. Tony Lee, M.D.Alhambra, CA · No drug or device payments recorded (2025) ·
(626) 203-6646 Dr. Ardientes Tolentino, NURSE PRACTITIONERAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 423-6500 Dr. Ga Yun ParkAnaheim, CA · No drug or device payments recorded (2025) ·
(818) 321-0142 Dr. Krista Prewett, FNPAnaheim, CA · No drug or device payments recorded (2025) ·
(949) 932-5133 Dr. Marigangaiah Mahadev, MDAnaheim Hills, CA · $1,758 in drug and device payments (2025) ·
(714) 998-1941 Dr. Sandra Shetzline, DOArnold, CA · $70 in drug and device payments (2025) · Telehealth ·
(209) 795-4488 Dr. Patrick WelchArroyo Grande, CA · $10,116 in drug and device payments (2025) ·
(805) 270-1700 Dr. Shakti Srivastava, MD, FAAFPBakersfield, CA · $126 in drug and device payments (2025) ·
(661) 326-2800 Dr. Vincent Maddela, M.D.Bakersfield, CA · No drug or device payments recorded (2025) ·
(661) 716-1070 Dr. Eunice Tuungafasi, FNPBay Point, CA · No drug or device payments recorded (2025) ·
(925) 457-6776 Dr. Maryin Altamirano, MDBeaumont, CA · No drug or device payments recorded (2025) · Telehealth ·
(951) 846-2611 Dr. Gonzalo Castaneda, MDBellflower, CA · $161 in drug and device payments (2025) ·
(562) 804-8112 Dr. Geoffrey Collins, M.D.Belvedere, CA · No drug or device payments recorded (2025) ·
(415) 435-6308 Dr. Anthony Somkin, M.D.Berkeley, CA · No drug or device payments recorded (2025) ·
(510) 548-8888 Dr. Elizabeth Hedelman, M.D.Berkeley, CA · No drug or device payments recorded (2025) ·
(510) 643-5625 Dr. Robert Kevess, MDBerkeley, CA · No drug or device payments recorded (2025) ·
(510) 643-7110 Dr. Albert CooperBrea, CA · No drug or device payments recorded (2025) ·
(714) 528-1476 Dr. Dawn Vollmann, PABrea, CA · $542 in drug and device payments (2025) · Telehealth ·
(714) 671-2936 Dr. Irina Seibert, RNBrentwood, CA · No drug or device payments recorded (2025) ·
(408) 410-0514 Dr. Amy Winstead, MDBurbank, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 556-2700 Dr. Radhika Varma, MDBurlingame, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 652-8500 Dr. David Vesco, M.DCalabasas, CA · $1,106 in drug and device payments (2025) ·
(818) 880-0799 Dr. Sandra Ghatan, NPCalabasas, CA · No drug or device payments recorded (2025) ·
(310) 210-1256 Dr. Keri Valdez, MSN, FNPCalexico, CA · $2,951 in drug and device payments (2025) ·
(760) 554-4828 Dr. Leland Werner, D.O.Camarillo, CA · No drug or device payments recorded (2025) ·
(805) 759-9959 Dr. Eric Kuehne, M.D.Canyon Country, CA · No drug or device payments recorded (2025) ·
(661) 250-5200 Dr. Norman Kikuchi, MDCarmichael, CA · No drug or device payments recorded (2025) ·
(916) 483-5400 Dr. Kimberly Chappell, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 898-5241 Dr. Sana Khan, D.OChino, CA · No drug or device payments recorded (2025) ·
(909) 464-9675 Dr. Elaine Curtis, M.D.Chula Vista, CA · No drug or device payments recorded (2025) ·
(619) 421-4311 Dr. Myrna Coronado, MDChula Vista, CA · No drug or device payments recorded (2025) ·
(619) 428-1330 Dr. Manh Pham, M.D.Citrus Heights, CA · No drug or device payments recorded (2025) · Telehealth ·
(916) 904-3000 Dr. Victoria Ryan, MDCitrus Heights, CA · No drug or device payments recorded (2025) · Telehealth ·
(916) 536-3540 Dr. Arnold Shinder, D.O.City Of Industry, CA · No drug or device payments recorded (2025) ·
(626) 369-9663 Dr. Komola Shaban, MDClovis, CA · $289 in drug and device payments (2025) · Telehealth ·
(512) 650-6550 Dr. Jin YuCoalinga, CA · No drug or device payments recorded (2025) ·
(559) 934-8304 Dr. Frank Chow, D.O.Commerce, CA · No drug or device payments recorded (2025) ·
(323) 722-8481 Dr. Tammy Hunter-horton, FNP-BCCorte Madera, CA · No drug or device payments recorded (2025) ·
(415) 924-5010 Dr. Cecilia Pham, DOCosta Mesa, CA · $119 in drug and device payments (2025) · Telehealth ·
(949) 791-3250 Dr. Raul Miranda, MDCosta Mesa, CA · No drug or device payments recorded (2025) ·
(949) 646-1631 Dr. Selina HanCovina, CA · No drug or device payments recorded (2025) ·
(626) 967-6225 Dr. Claire Williams, MDCrescent City, CA · $20 in drug and device payments (2025) ·
(707) 465-1000 Dr. John Molitoris, M.D.Culver City, CA · No drug or device payments recorded (2025) ·
(215) 478-2072 Dr. Laura Stevens, M.D.Cupertino, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 746-0300 Dr. Nguyen Luu-trong, M.D.Cypress, CA · No drug or device payments recorded (2025) ·
(714) 504-5801 Dr. Gecelle De Guia, DODaly City, CA · No drug or device payments recorded (2025) ·
(559) 499-6450 Dr. Donna Kono, M.D.Davis, CA · No drug or device payments recorded (2025) ·
(530) 752-2300 Dr. Thanh Ha, DODowney, CA · No drug or device payments recorded (2025) ·
(510) 209-8382 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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