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. Morris Hasson, MDAliso Viejo, CA · No drug or device payments recorded (2025) ·
(949) 382-2050 Dr. Phuong Ta, M.D.Aliso Viejo, CA · No drug or device payments recorded (2025) ·
(949) 389-9409 Dr. Samuel Herman, M.D.Aliso Viejo, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 791-3104 Dr. Shawn Kaye, MDAliso Viejo, CA · $22 in drug and device payments (2025) · Telehealth ·
(949) 791-3104 Dr. Sina Khaneki, M.D.Aliso Viejo, CA · No drug or device payments recorded (2025) ·
(949) 282-3708 Dr. Terence Offenberger, MDAliso Viejo, CA · No drug or device payments recorded (2025) ·
(949) 448-0656 Dr. Waleed Awan, MDAliso Viejo, CA · $45 in drug and device payments (2025) ·
(949) 521-6060 Dr. Dana Ryan, DR.Alpine, CA · No drug or device payments recorded (2025) ·
(619) 662-4100 Dr. Joyce Kellawon, MDAlpine, CA · No drug or device payments recorded (2025) ·
(619) 445-6200 Dr. Robert Klemens, M.D.Alpine, CA · No drug or device payments recorded (2025) ·
(619) 445-7358 Dr. Ruth Wang, MD, MEDAlpine, CA · No drug or device payments recorded (2025) ·
(619) 445-6200 Dr. Laura Peterson, M.D.Altadena, CA · No drug or device payments recorded (2025) ·
(626) 398-1543 Dr. Reginald Friesen, M.D.Alta Loma, CA · No drug or device payments recorded (2025) ·
(440) 522-0039 Dr. Marichelle Othman, M.D.American Canyon, CA · No drug or device payments recorded (2025) ·
(707) 552-7421 Dr. Susan Pereira, M.D.American Canyon, CA · No drug or device payments recorded (2025) ·
(707) 815-0063 Dr. Abraham Harn, DOAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-8282 Dr. Adarsha Bajracharya, MD Dr. Ahmed Badr, MDAnaheim, CA · $674 in drug and device payments (2025) ·
(714) 995-2901 Dr. Alan Wilkins, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Alexander Alsoufiev, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 780-5695 Dr. Alexander Berdy, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Alexander Cheung, M.DAnaheim, CA · $275 in drug and device payments (2025) · Telehealth ·
(714) 956-5200 Dr. Alex Lim, MD MPHAnaheim, CA · $322 in drug and device payments (2025) ·
(520) 694-8888 Dr. Ali Al-saleh, M.D.Anaheim, CA · $179 in drug and device payments (2025) · Telehealth ·
(714) 974-0611 Dr. Alireza Khazaeizadeh, MDAnaheim, CA · $533 in drug and device payments (2025) ·
(949) 600-7733 Dr. Alireza Noorian, MDAnaheim, CA · $120 in drug and device payments (2025) ·
(714) 644-2000 Dr. Amena Hokoki, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Amirtha Ajit, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 776-3180 Dr. Ammar Dahodwala, MDAnaheim, CA · $60 in drug and device payments (2025) · Telehealth ·
(714) 974-2900 Dr. Andrew Morado, M.D.Anaheim, CA · $920 in drug and device payments (2025) ·
(714) 772-8282 Dr. Andrieu Aguinaldo, MD Dr. Anisha Ghanshani, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Anne Onyekwuluje, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 202-2330 Dr. Annie Harrington, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2305 Dr. Archana Shende, M DAnaheim, CA · $1,684 in drug and device payments (2025) · Telehealth ·
(714) 999-1050 Dr. Arjun Makam, D.O.Anaheim, CA · $1,886 in drug and device payments (2025) · Telehealth ·
(714) 774-9747 Dr. Arlena Menda, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 533-4511 Dr. Audrey Konow, M.D.Anaheim, CA · $398 in drug and device payments (2025) ·
(714) 975-1507 Dr. Bee KyawAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 995-5219 Dr. Boichuyen Nguyen, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Cassidy Tsay, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Celyne Phung, MDAnaheim, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 772-8282 Dr. Cheryl Fong, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-4000 Dr. Ching Lee, MDAnaheim, CA · $137 in drug and device payments (2025) · Telehealth ·
(714) 527-9111 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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