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. Todd Fearer, MDSanta Barbara, CA · No drug or device payments recorded (2025) ·
(805) 969-4382 Dr. Trevor Axelrod, M.D.Santa Barbara, CA · No drug or device payments recorded (2025) ·
(805) 569-7315 Dr. William Koonce, MDSanta Barbara, CA · $1,024 in drug and device payments (2025) ·
(805) 682-7200 Dr. William Meller, M.D.Santa Barbara, CA · No drug or device payments recorded (2025) ·
(805) 682-7411 Dr. William Shapiro, M.D.Santa Barbara, CA · No drug or device payments recorded (2025) ·
(805) 569-8922 Dr. W O'callaghanSanta Barbara, CA · No drug or device payments recorded (2025) ·
(805) 681-1761 Dr. Yana Gristan, MDSanta Barbara, CA · $239 in drug and device payments (2025) · Telehealth ·
(805) 682-7111 Dr. Aaron Williams, MDSanta Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 851-1000 Dr. Alan Man, MDSanta Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 851-1000 Dr. Albert MaSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-3834 Dr. Alpana Shekhar, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Ana Herdocia, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Ana Milena Brittain, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-7615 Dr. Andrea Sullivan, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 986-7777 Dr. Andrew Lees, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-4163 Dr. Ann Kodani, D.O.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-2414 Dr. Anthony Saglimbeni, M.D.Santa Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 293-7767 Dr. Aravind Swaminathan, M.D.Santa Clara, CA · $5,941 in drug and device payments (2025) · Telehealth ·
(408) 851-1000 Dr. Arlene-clarita Maxino, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Asma Habib, MDSanta Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 241-3801 Dr. Astrid Haefner, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Bali GuptaSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Chin Liao, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Christine Fong, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Curtis Rollins, M.D., D.M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 985-2401 Dr. Dale Yamashita, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Daniel Tseng, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Danny Sam, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. David Juan, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 554-1400 Dr. Deepinder Singh, M.DSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-2171 Dr. Divjot Sandhu, DOSanta Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 851-1000 Dr. Ei Tun, MDSanta Clara, CA · $19 in drug and device payments (2025) ·
(669) 232-7824 Dr. Elene LamSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-7214 Dr. Elisabeth Calvelli, M.D., M.A.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 554-9800 Dr. Emily Cabebe, MDSanta Clara, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 241-3801 Dr. Eric Messner, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Frederic Moy, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. George Peredy, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 236-6400 Dr. Hallen Pham, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 554-9800 Dr. Harpreet Pannu, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 554-9800 Dr. Hemal Patel, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-3834 Dr. Hessam Noralahi, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 988-8581 Dr. Howard Lin, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Hyojik Lee, D.O.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 236-5814 Dr. Ian Lee, D.O.Santa Clara, CA · $141 in drug and device payments (2025) · Telehealth ·
(408) 851-0749 Dr. Indu Vanteru, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Inna StrugatskySanta Clara, CA · $21 in drug and device payments (2025) ·
(408) 739-6000 Dr. Irene Ho, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Irvin Ma, MDSanta Clara, CA · $1,253 in drug and device payments (2025) ·
(408) 702-6668 Dr. Iype Abraham, M.D.Santa Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-2005 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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