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. Jonathan Chao, M.D.Palo Alto, CA · $338 in drug and device payments (2025) · Telehealth ·
(650) 321-4121 Dr. Jonathan Chun, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Jonathan Scott, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-5948 Dr. Josef Hannah, DOPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Joseph Nadler, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Joyce Chen, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Joyce Pyun Cho, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 853-2984 Dr. Julie Wissink, M.D.Palo Alto, CA · $1,211 in drug and device payments (2025) ·
(650) 329-0440 Dr. Karen Butterfield, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Kathryn Renschler, M.D.Palo Alto, CA · $1,244 in drug and device payments (2025) · Telehealth ·
(650) 329-0440 Dr. Kavita Renduchintala, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Kirsti Elder, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 736-5211 Dr. Kishore Khankari, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-2977 Dr. Lara Charneco, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 321-4121 Dr. Laura Holmes, MDPalo Alto, CA · $33 in drug and device payments (2025) ·
(650) 321-4121 Dr. Lauren Carpenter, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Lenore Cohen, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Leona Ebara, M.DPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-2977 Dr. Lisa Backus, MD PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Lisa Gervin, M.D.Palo Alto, CA · $62 in drug and device payments (2025) · Telehealth ·
(650) 853-3355 Dr. Luis Folan, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 853-2977 Dr. Maggie Jones, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Mahnoosh Seifoddini, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(209) 946-3400 Dr. Marc Thibonnier, M.D., M.SC.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 470-6192 Dr. Maren Pedersen, MDPalo Alto, CA · $135 in drug and device payments (2025) · Telehealth ·
(650) 325-6778 Dr. Margaret Forsyth, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Margaret Mongare, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 942-8309 Dr. Marina Martin, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 725-5222 Dr. Mary Goldstein, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Mary Varghese, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Mathew Hernandez, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 853-2977 Dr. Matthew Stevenson, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Megan Palmisano, M.D.Palo Alto, CA · $26 in drug and device payments (2025) · Telehealth ·
(650) 853-2977 Dr. Mehr Kashyap, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 725-2504 Dr. Michael Nierenberg, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5359 Dr. Michelle Hauser, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Mina Charon, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Muhammad Bashir, MDPalo Alto, CA · $527 in drug and device payments (2025) ·
(650) 497-8000 Dr. Mundeep Chawla, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Naeem Hashmi, MD; PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Nainwant Singh, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(916) 690-2946 Dr. Nakul Sagdeo, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Namita Ravi, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Natalie HowlettPalo Alto, CA · $223 in drug and device payments (2025) · Telehealth ·
(650) 723-6961 Dr. Nawal Johansen, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 313-2140 Dr. Neelam Mohapatra, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Neeta Jain, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 321-4121 Dr. Niloufar Khanna, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 853-3355 Dr. Nina Ramchandani, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Norman Rosenstock, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 223-7083 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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