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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 in Los Angeles1,417 providers
Internal Medicine in San Francisco1,322 providers
Internal Medicine in San Diego970 providers
Internal Medicine in Sacramento602 providers
Internal Medicine in Oakland434 providers
Internal Medicine in San Jose433 providers
Internal Medicine in Stanford383 providers
Internal Medicine in Fresno339 providers
Internal Medicine in Torrance230 providers
Internal Medicine in Long Beach225 providers
Internal Medicine in Bakersfield210 providers
Internal Medicine in Loma Linda209 providers
Internal Medicine in Palo Alto189 providers
Internal Medicine in Anaheim188 providers
Internal Medicine in Orange188 providers
Internal Medicine in Riverside188 providers
Internal Medicine in Walnut Creek184 providers
Internal Medicine in Santa Monica170 providers
Internal Medicine in La Jolla161 providers
Internal Medicine in Roseville159 providers
Internal Medicine in Irvine155 providers
Internal Medicine in Beverly Hills152 providers
Internal Medicine in Santa Clara142 providers
Internal Medicine in Pasadena138 providers

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. David Woodhouse, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 454-5800
Dr. Deepak Mehta, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-7007
Dr. Eri Joyo, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 624-2670
Dr. Frank Karneges, DO
Vacaville, CA · No drug or device payments recorded (2025) · (707) 454-5800
Dr. Fred Parham, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 447-3600
Dr. Garth Davis, MD
Vacaville, CA · $39 in drug and device payments (2025) · (707) 624-7500
Dr. Gurjit Kaur, MD
Vacaville, CA · $125 in drug and device payments (2025) · (707) 359-1816
Dr. Hon Chan, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 454-5800
Dr. Hydee Abaya Ghazaleh, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 624-2480
Dr. Jalal Yaganehdoust, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 448-6841
Dr. James Lee, MD
Vacaville, CA · $24 in drug and device payments (2025) · (707) 453-5000
Dr. Jason Rohrer, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 451-0182
Dr. Jonathan Abaya Ghazaleh, MD
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 624-4000
Dr. Jonathon Valeriote
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 427-4900
Dr. Julie Nguyen, MD
Vacaville, CA · $28 in drug and device payments (2025) · (707) 815-9049
Dr. Khin Win, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 451-0182
Dr. Kimberly Wiley, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Kulbir Bajwa, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-7500
Dr. Kyaw Aung, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Liyan Zhang, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Lyndsey Mcmillan, D.O.
Vacaville, CA · $59 in drug and device payments (2025) · (707) 624-4000
Dr. Manpreet Sidhu
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-1262
Dr. Mariana Lotersztain, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 724-3024
Dr. Marissa Neis-gimenez, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Mary Minguito, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Micheal Massoud, D.O.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-4000
Dr. Mohamed Falaha, MD
Vacaville, CA · No drug or device payments recorded (2025) · (650) 223-1835
Dr. Morris Li, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-4000
Dr. Narinder Saukhla, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-7007
Dr. Nicolas Aguilera, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-7007
Dr. Nikhil Mulchandani, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 651-1262
Dr. Richard Lasslo, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Richard Tan, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 451-0182
Dr. Romenna Galang, MD
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 427-4900
Dr. Shalvin Prasad, DO
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-1262
Dr. Shobhna Parmar, D.O.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 651-2440
Dr. Sreelakshmi Vasudevan
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-4000
Dr. Sukhjinder Kaur, MD
Vacaville, CA · $26 in drug and device payments (2025) · Telehealth · (707) 427-4900
Dr. Sungryong Noh, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-2709
Dr. Tesie Rallos, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 451-0182
Dr. Thomas Erskine, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 624-7979
Dr. Thomas Fashinell, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Usha Pai, M.D.
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-7007
Dr. Xuewei Zhu, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 453-5000
Dr. Yuen Chen, MD
Vacaville, CA · No drug or device payments recorded (2025) · (707) 454-3261
Dr. Aisha Shafiq, M.D.
Valencia, CA · $1,092 in drug and device payments (2025) · (661) 222-2600
Dr. Alan Silver, MD
Valencia, CA · No drug or device payments recorded (2025) · (661) 287-1551
Dr. Amanpreet Bath, M.D.
Valencia, CA · $324 in drug and device payments (2025) · Telehealth · (661) 753-5464
Dr. Anna Melkonyan, DO
Valencia, CA · No drug or device payments recorded (2025) · Telehealth · (661) 753-5464
Dr. Arash Nafisi, M.D.
Valencia, CA · No drug or device payments recorded (2025) · (661) 253-5851

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.

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.

Related reading on HealthcareDiscovery.AI

Internal Medicine in all 50 states Search all 17,715 in the directory Ask Zach for help choosing

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Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory. Are you a Internal Medicine in California? Get featured.