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. Lillian Tseng, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Linda Row, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Lisa Craig, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Lisa Woll, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Lonnie Bristow, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 933-2733 Dr. Loreta Kalish, M.D.Walnut Creek, CA · $793 in drug and device payments (2025) · Telehealth ·
(925) 939-1220 Dr. Maeve O'regan, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-0417 Dr. Mandakini Patel, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Margaret Hegg, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mariel Bailey, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mariel Muriel Pastrana, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Marilyn Steppe, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mark Hlavac, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Martin Braker, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 937-4057 Dr. Marvi Rijhwani, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Maryam Safa, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Matthew Walvick, D.O.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9740 Dr. Maureen Stevenson, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9720 Dr. Meena Dopp, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(415) 525-3527 Dr. Meena Rijhwani, M.D.Walnut Creek, CA · $96 in drug and device payments (2025) · Telehealth ·
(925) 296-9730 Dr. Meera Jagannath, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-6973 Dr. Megha AmbatiWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3312 Dr. Mei Chow-kwan, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-0417 Dr. Michael Park, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Michael Weiss, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Monica Ruiz Durant, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 899-2710 Dr. Monique Delisser, M.D.Walnut Creek, CA · $133 in drug and device payments (2025) · Telehealth ·
(925) 935-2333 Dr. M.y. James Lee, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Mysore Shilpa, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3393 Dr. Nancy Chang, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Nason Azizi, M.D.Walnut Creek, CA · $23 in drug and device payments (2025) ·
(925) 947-3312 Dr. Natalie Chang, M.D.Walnut Creek, CA · $79 in drug and device payments (2025) · Telehealth ·
(925) 296-9740 Dr. Natalie Chang, D.O.Walnut Creek, CA · $19 in drug and device payments (2025) ·
(925) 295-4070 Dr. Nathan Nguyen, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4050 Dr. Neesha Pammi, M.D.Walnut Creek, CA · $625 in drug and device payments (2025) · Telehealth ·
(925) 930-9978 Dr. Nellia Karakozova, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Nicholas Fong, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Nicole Hickey, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Noushin Haddad-tehrani, MDWalnut Creek, CA · $952 in drug and device payments (2025) · Telehealth ·
(925) 947-0417 Dr. Patricia Anne AtalWalnut Creek, CA · $117 in drug and device payments (2025) ·
(925) 295-4000 Dr. Patricia Moreno, MDWalnut Creek, CA · $23 in drug and device payments (2025) ·
(925) 295-4000 Dr. Paul Endo, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9740 Dr. Paul Korn, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 906-2000 Dr. Poornima Goyal, M.D.Walnut Creek, CA · $20 in drug and device payments (2025) · Telehealth ·
(925) 296-9707 Dr. Poysophon PoysophonWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Rajesh Joshi, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 947-3312 Dr. Rashmi Jain, M.DWalnut Creek, CA · $212 in drug and device payments (2025) ·
(925) 937-9807 Dr. Rebecca Parish, M.D.Walnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 296-9740 Dr. Reza Esmaeil Saveh, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 Dr. Richard Raffel, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4000 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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