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. Roger Lane, MDSolvang, CA · $73 in drug and device payments (2025) · Telehealth ·
(805) 688-2600 Dr. Sandra Wilson, MDSolvang, CA · No drug or device payments recorded (2025) · Telehealth ·
(805) 691-9712 Dr. Shayli MerloSolvang, CA · $256 in drug and device payments (2025) ·
(805) 688-5488 Dr. William Heringer, MDSolvang, CA · $113 in drug and device payments (2025) · Telehealth ·
(805) 688-7200 Dr. Brian Sebastian, MDSonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-3870 Dr. Clinton Lane, M.D.Sonoma, CA · No drug or device payments recorded (2025) ·
(707) 938-2345 Dr. Guy Delorefice, M.D.Sonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-1255 Dr. Jing Zhao, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 939-6070 Dr. John Boyce-smith, MDSonoma, CA · No drug or device payments recorded (2025) ·
(415) 613-5338 Dr. Lawrence Huan, MDSonoma, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 938-3870 Dr. Marianne Kramer, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 938-6556 Dr. Victor Iacovoni, M.D.Sonoma, CA · No drug or device payments recorded (2025) ·
(707) 935-5000 Dr. Walter Prehn, MDSonoma, CA · No drug or device payments recorded (2025) ·
(707) 495-7762 Dr. Yong Liu, M.D.Sonoma, CA · $605 in drug and device payments (2025) · Telehealth ·
(707) 933-0500 Dr. Arturo Alvarez Antezana, MDSonora, CA · No drug or device payments recorded (2025) ·
(209) 536-5000 Dr. Brenda Forrest, M.DSonora, CA · No drug or device payments recorded (2025) ·
(209) 536-3738 Dr. Daniel Meador, MDSonora, CA · No drug or device payments recorded (2025) ·
(209) 694-7123 Dr. Daniel Phillips, M.D. Dr. David Su, MDSonora, CA · No drug or device payments recorded (2025) ·
(209) 588-2600 Dr. Jason Jeffery, M.D.Sonora, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 536-5060 Dr. John Shield, MDSonora, CA · No drug or device payments recorded (2025) ·
(209) 536-5070 Dr. Kyi Kyi Win, MDSonora, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 337-0059 Dr. Leslie Brocchini, MDSonora, CA · No drug or device payments recorded (2025) ·
(209) 743-4249 Dr. Reiker Schultz, MDSonora, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 536-5060 Dr. Zachary Nichols, DOSonora, CA · No drug or device payments recorded (2025) ·
(209) 536-5000 Dr. Sara Lackner, MDSoquel, CA · No drug or device payments recorded (2025) ·
(831) 462-6206 Dr. John Lin, M.D.South El Monte, CA · $146 in drug and device payments (2025) ·
(626) 350-7957 Dr. Julie Vu, M.D.South El Monte, CA · No drug or device payments recorded (2025) ·
(626) 398-6300 Dr. Mohan Rao, MDSouth El Monte, CA · No drug or device payments recorded (2025) ·
(626) 331-1560 Dr. David Skinner, DOSouth Gate, CA · No drug or device payments recorded (2025) ·
(323) 567-2425 Dr. John Wei, M.D.South Gate, CA · $101 in drug and device payments (2025) ·
(323) 567-2384 Dr. Linda Barkodar, M.D.South Gate, CA · No drug or device payments recorded (2025) ·
(323) 567-9909 Dr. Noor Alasady, DOSouth Gate, CA · No drug or device payments recorded (2025) ·
(868) 774-0105 Dr. Richard Jordan, M.D.South Gate, CA · No drug or device payments recorded (2025) ·
(323) 563-9499 Dr. Tony Tseng, M.D., M.S.South Gate, CA · $390 in drug and device payments (2025) · Telehealth ·
(323) 763-1300 Dr. Gary Cooper, MDSouth Lake Tahoe, CA · No drug or device payments recorded (2025) ·
(530) 543-5685 Dr. John Lewison, MDSouth Lake Tahoe, CA · No drug or device payments recorded (2025) ·
(530) 541-3420 Dr. Meagan Nordstrom, MDSouth Lake Tahoe, CA · No drug or device payments recorded (2025) ·
(530) 541-3420 Dr. Oliver Medzihradsky, MDSouth Lake Tahoe, CA · No drug or device payments recorded (2025) ·
(530) 542-3000 Dr. Stefan Schunk, MDSouth Lake Tahoe, CA · No drug or device payments recorded (2025) ·
(530) 541-3420 Dr. Beauty Swe, MDSouth Pasadena, CA · $108 in drug and device payments (2025) · Telehealth ·
(626) 356-4000 Dr. Carolyn Lamb, M.D.,South Pasadena, CA · $53 in drug and device payments (2025) ·
(626) 799-4151 Dr. Christina Stiles, M.D.South Pasadena, CA · No drug or device payments recorded (2025) ·
(310) 429-8177 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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