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. Rafid Arabo, MDLa Mesa, CA · $193 in drug and device payments (2025) ·
(888) 664-8297 Dr. Rashid Paband, M.D.La Mesa, CA · $189 in drug and device payments (2025) · Telehealth ·
(619) 698-9375 Dr. Robert Foster, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 461-9600 Dr. Rommel Navarrete, M.D.La Mesa, CA · $1,005 in drug and device payments (2025) · Telehealth ·
(619) 460-4050 Dr. Salam Yatooma, M.D.La Mesa, CA · $338 in drug and device payments (2025) ·
(619) 937-6345 Dr. Salvatore Tarantino, M.D.La Mesa, CA · $461 in drug and device payments (2025) · Telehealth ·
(619) 462-5555 Dr. Shota Gurchumelidze, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(619) 668-8100 Dr. Sinan Khayyat, MDLa Mesa, CA · $658 in drug and device payments (2025) · Telehealth ·
(619) 740-6000 Dr. Sowmya Muralidhara, M.DLa Mesa, CA · $131 in drug and device payments (2025) ·
(619) 461-1920 Dr. Stephen Reitman, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 460-4050 Dr. Sushma Boya, M.D.La Mesa, CA · $106 in drug and device payments (2025) ·
(858) 999-4136 Dr. Sydney Dangelo, DOLa Mesa, CA · $389 in drug and device payments (2025) · Telehealth ·
(619) 462-5555 Dr. Teh Liang, M.D.La Mesa, CA · No drug or device payments recorded (2025) ·
(858) 499-2600 Dr. Thynn WaiLa Mesa, CA · No drug or device payments recorded (2025) · Telehealth ·
(619) 644-6812 Dr. Victor Seikaly, M.D.La Mesa, CA · $487 in drug and device payments (2025) ·
(619) 460-4000 Dr. Ajit Shah, M.D.La Mirada, CA · $266 in drug and device payments (2025) · Telehealth ·
(562) 947-1619 Dr. Alexander Chen, D.O.La Mirada, CA · No drug or device payments recorded (2025) ·
(562) 902-4929 Dr. Anwar Arastu, MDLa Mirada, CA · No drug or device payments recorded (2025) ·
(562) 941-9853 Dr. Hoa Nguyen, M.D.La Mirada, CA · $3,073 in drug and device payments (2025) · Telehealth ·
(562) 947-9591 Dr. Rocely Ella-tamayoLa Mirada, CA · No drug or device payments recorded (2025) ·
(562) 947-9197 Dr. Tamra Hocking, M.D.La Mirada, CA · No drug or device payments recorded (2025) ·
(562) 903-4841 Dr. Orestes Pavia Sanchez, M.D.Lamont, CA · No drug or device payments recorded (2025) ·
(661) 845-3731 Dr. Ali Jafferi, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-8581 Dr. Aminu Birhan, M.D.Lancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(661) 726-2226 Dr. Anthony Dulgeroff, M.D.Lancaster, CA · $41 in drug and device payments (2025) · Telehealth ·
(661) 945-5984 Dr. Antony Fung, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-2222 Dr. Anupam Singla, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-9411 Dr. Ashruta Patel-ahuja, DO, MSLancaster, CA · $28 in drug and device payments (2025) · Telehealth ·
(661) 874-4050 Dr. Canagaretnam Chandradas, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-8581 Dr. Charles Lim, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-5984 Dr. Deepak Shivaram, M.D.Lancaster, CA · $1,128 in drug and device payments (2025) · Telehealth ·
(661) 949-5941 Dr. Ethan HsuLancaster, CA · No drug or device payments recorded (2025) ·
(661) 729-2000 Dr. Ferdinand Panoussi, D.OLancaster, CA · $291 in drug and device payments (2025) · Telehealth ·
(661) 726-6254 Dr. George Mya, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-9411 Dr. Gyanesh Agrawal, M.D.Lancaster, CA · $51 in drug and device payments (2025) ·
(661) 471-4000 Dr. Harihar Agarwal, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-5000 Dr. Hazem Aboaid, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 726-6254 Dr. Hong Phuc Nguyen, DOLancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-9411 Dr. Ivy Semenez, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(877) 554-4404 Dr. Jose Pascual, M.D.Lancaster, CA · $20 in drug and device payments (2025) ·
(661) 948-8581 Dr. Joseph Ahoubim, DOLancaster, CA · No drug or device payments recorded (2025) ·
(951) 617-0179 Dr. Junaid Fitter, M.D.Lancaster, CA · $21 in drug and device payments (2025) ·
(661) 948-8581 Dr. Kartikey Mehta, M.D.Lancaster, CA · No drug or device payments recorded (2025) ·
(661) 948-8581 Dr. Khin Win, M.D.Lancaster, CA · $150 in drug and device payments (2025) ·
(661) 945-5984 Dr. Kumarasamy Sivakumar, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 949-5908 Dr. Lawrence OkumotoLancaster, CA · No drug or device payments recorded (2025) ·
(503) 494-7735 Dr. Lay Khin, MDLancaster, CA · No drug or device payments recorded (2025) ·
(661) 945-5984 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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