Internal Medicine Doctors in California
Data updated monthly · Last refresh October 2026
17,715 Internal Medicine providers practice in California, including 4,245 (24%) 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.
17,715providers
4,245telehealth
Los Angelestop city
Internal Medicine by city in California
Choose a city to see providers there.
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. Luis Cabrera, DOLancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-6254 Dr. Manish Desai, D.OLancaster, CA · No drug or device payments recorded (2025) ·
(661) 723-2879 Dr. Marc Lorenz Montecillo, M.D.Lancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(661) 723-2442 Dr. Marla Giem, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-5984 Dr. Marvin Ginsburg, M.D.Lancaster, CA · $260 in drug and device payments (2025) ·
(661) 945-5984 Dr. Marvin Ross, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 822-4402 Dr. Naili Chen, D.O., MPH, MASCLancaster, CA · No drug or device payments recorded (2025) ·
(661) 729-8655 Dr. Nilesh Hingarh, M.D.Lancaster, CA · $712 in drug and device payments (2025) · Telehealth ·
(661) 414-7677 Dr. Qiyuan Dai, MDLancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(661) 942-2391 Dr. Ravi Janumpally, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 433-2072 Dr. Russell Greif, D.O.Lancaster, CA · $662 in drug and device payments (2025) · Telehealth ·
(661) 726-6490 Dr. Saima Rashid, D.O.Lancaster, CA · $185 in drug and device payments (2025) ·
(201) 341-0905 Dr. Sami Nafoosi, MDLancaster, CA · $1,028 in drug and device payments (2025) ·
(661) 945-5984 Dr. Sangar Selva, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-7496 Dr. Satya Dandamudi, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-4429 Dr. Shahid Hassan, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-5984 Dr. Shahid Siddiqui, MDLancaster, CA · $239 in drug and device payments (2025) ·
(702) 579-5858 Dr. S Joseph Marianayagam, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-0012 Dr. Syed UzairLancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(973) 429-6196 Dr. Timothy Chandler, D.O.Lancaster, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Tun OoLancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 437-9421 Dr. Val Valco, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(732) 222-5200 Dr. Victor Liao, DOLancaster, CA · No drug or device payments recorded (2025) ·
(626) 688-3568 Dr. Violeta Vallejo-sinavsky, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-8581 Dr. Xiao Wan, D.O.Lancaster, CA · $515 in drug and device payments (2025) · Telehealth ·
(626) 688-3568 Dr. Yon Yarn, D.O.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 951-3009 Dr. Young Han, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 949-5000 Dr. Young Ko, MDLancaster, CA · $7,873 in drug and device payments (2025) · Telehealth ·
(661) 945-0723 Dr. Zin Win, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-2245 Dr. Andrew Mui, M.D.La Palma, CA · $567 in drug and device payments (2025) · Telehealth ·
(714) 527-8777 Dr. Curtis Lee, MDLa Palma, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Edward Jang, M.D.La Palma, CA · No drug or device payments recorded (2025) ·
(714) 880-3801 Dr. Jongjin Kim, M.D.La Palma, CA · $129 in drug and device payments (2025) ·
(714) 752-6088 Dr. Justin Wu, D.O.La Palma, CA · $879 in drug and device payments (2025) ·
(714) 670-1340 Dr. Kwan Tan, M.D.La Palma, CA · $2,364 in drug and device payments (2025) · Telehealth ·
(714) 527-8777 Dr. Mahendra Patel, M.D.La Palma, CA · No drug or device payments recorded (2025) ·
(714) 994-1401 Dr. Rafaelito Victoria, MDLa Palma, CA · $570 in drug and device payments (2025) · Telehealth ·
(562) 866-1764 Dr. Richard Ruth, M.D.La Palma, CA · No drug or device payments recorded (2025) ·
(714) 390-0476 Dr. Shaheen Iqbal, M.D.La Palma, CA · $27 in drug and device payments (2025) ·
(714) 266-0052 Dr. Winston Wong, M.D.La Palma, CA · $1,413 in drug and device payments (2025) · Telehealth ·
(714) 527-8777 Dr. Xiao-ying Fang, M.D.La Palma, CA · No drug or device payments recorded (2025) ·
(714) 206-2378 Dr. Yih Wu, M.D.La Palma, CA · No drug or device payments recorded (2025) ·
(714) 522-4009 Dr. John Sedgh, M.D.La Puente, CA · No drug or device payments recorded (2025) ·
(310) 429-7078 Dr. Amanda Curnock, MDLa Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Dr. Brian Gery, MDLa Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Dr. Dennis Long, M.D.La Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Dr. Evelyn Picker, M.D.La Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Dr. Kayvan Kani, M.D.La Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Dr. Kinji Hawthorne, MDLa Quinta, CA · No drug or device payments recorded (2025) ·
(760) 771-1000 Dr. Perry Schall, M.D.La Quinta, CA · No drug or device payments recorded (2025) ·
(760) 610-7300 Conditions Internal Medicine providers in California commonly treat
Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.
- High blood pressure
- Type 2 diabetes
- High cholesterol
- Preventive care
- Chronic disease management
Common questions
How many Internal Medicine providers are in California?There are 17,715 Internal Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Internal Medicine providers in California offer telehealth?Yes. 4,245 of the 17,715 Internal Medicine providers in California (about 24%) report offering telehealth services in CMS data.
Which cities in California have the most Internal Medicine providers?Los Angeles (1,417), San Francisco (1,322), San Diego (970) have the highest concentration of Internal Medicine providers in California.
How many Internal Medicine providers in California received drug or device company payments?5,614 of 17,715 Internal Medicine providers in California (32%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
What conditions do Internal Medicine providers in California treat?Internal Medicine providers commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management and related conditions. Individual practices vary, so confirm with the provider before booking.
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 Internal Medicine Doctors in California work in independent practices or large health systems?Among 10,847 Internal Medicine Doctors in California enrolled in Medicare, 20% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 67% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Internal Medicine Doctors in California work at?According to CMS facility affiliation records, the California hospitals where the most Internal Medicine Doctors hold privileges are Stanford Health Care in Stanford; UCSF Medical Center in San Francisco; Ronald Reagan UCLA Medical Center in Los Angeles.
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