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. Ebunoluwa Oshinuga-atere, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Elaine Le, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Elise Hughes-watkins, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9740 Dr. Elizabeth Seet, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 933-1210 Dr. Emily Nock, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Epifanio Deleon, M.D.Walnut Creek, CA · $125 in drug and device payments (2025) ·
(925) 933-1210 Dr. Evonne Tsou, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Fausan Tsai, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4050 Dr. Fazlollah Kasravi, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Francis Nepacena, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. George Slater, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Gisha Kattady, M.D.Walnut Creek, CA · $256 in drug and device payments (2025) · Telehealth ·
(925) 296-7490 Dr. Gretchen Kunitz, MDWalnut Creek, CA · $94 in drug and device payments (2025) · Telehealth ·
(925) 947-0417 Dr. Grishma Patel, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-0417 Dr. Gurinder Singh, D.O.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Gurveen Chahal, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Gurvinder Singh, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(209) 483-8232 Dr. Han Kyo Chang, M.DWalnut Creek, CA · $96 in drug and device payments (2025) ·
(716) 418-4665 Dr. Helen Stacey, MDWalnut Creek, CA · $1,505 in drug and device payments (2025) ·
(925) 937-9984 Dr. Helge Johannessen, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Himanshu Bhuria, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Huu Nguyen, D.O.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 225-5837 Dr. Hyun Lee, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 295-4000 Dr. Irina Kolomey, D.O.Walnut Creek, CA · $406 in drug and device payments (2025) · Telehealth ·
(925) 363-3395 Dr. Janet Hahn, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 295-4000 Dr. Jason Kung, MDWalnut Creek, CA · $232 in drug and device payments (2025) ·
(925) 295-4000 Dr. Javier Deleon, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 933-1210 Dr. Jaya Francis, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Jeff Ortiz, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Jessica Clima, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9000 Dr. Jessica Tsuei, MDWalnut Creek, CA · $288 in drug and device payments (2025) · Telehealth ·
(925) 471-7200 Dr. Joel Acab, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 906-2040 Dr. John Zuorski, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 952-2888 Dr. Jonathan Frank, M.D.Walnut Creek, CA · $43 in drug and device payments (2025) ·
(925) 933-1210 Dr. Jonathan Nguyen, M.D.Walnut Creek, CA · $181 in drug and device payments (2025) · Telehealth ·
(925) 295-4000 Dr. Joseph Henry, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(510) 409-6511 Dr. Joseph Long, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Joshua Ho, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Joy Bloch, M.D.Walnut Creek, CA · $852 in drug and device payments (2025) · Telehealth ·
(925) 296-9720 Dr. Joy Catolico, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Kamal Ghei, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Kamini Giri, M.DWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-6344 Dr. Kapil Anand, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(407) 756-2150 Dr. Karen Spizer, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Kartik Krishnan, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3312 Dr. Khashayar Montazeri, M.D.Walnut Creek, CA · $239 in drug and device payments (2025) ·
(925) 947-3393 Dr. Komal Rishi, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-7644 Dr. Krystal Sood, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Lakshmi Sowjanya Mallela, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2040 Dr. Lavinia Herbei, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 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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