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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. Timothy Gieseke, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 546-2180
Dr. Vunghi Hoang, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 576-4000
Dr. William Carroll, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 546-2180
Dr. William Costello, MD
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 571-4000
Dr. Zhen Zhou Feng, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 571-3621
Dr. Maria Ramos, M.D.
Santa Ynez, CA · No drug or device payments recorded (2025) · (805) 688-7070
Dr. Abbas Ali, M.D
Santee, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Amro Mahmoud, DO
Santee, CA · $128 in drug and device payments (2025) · Telehealth · (201) 888-9758
Dr. Azzah Arikat, MD
Santee, CA · No drug or device payments recorded (2025) · Telehealth · (858) 499-2715
Dr. Candice Hanna, DO
Santee, CA · No drug or device payments recorded (2025) · (858) 499-2600
Dr. David Corbin, MD
Santee, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Halyna West, M.D.
Santee, CA · $123 in drug and device payments (2025) · Telehealth · (619) 825-2732
Dr. Sally Hanoodi
Santee, CA · No drug or device payments recorded (2025) · (858) 499-2600
Dr. Violeta Martel, MD
Santee, CA · No drug or device payments recorded (2025) · (619) 956-2960
Dr. Carlos Carriedo, DO
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Elena Maria Sacamay, MD
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 428-4463
Dr. Jonathan Semaan, DO
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Martin Consunji, MD
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Michele Lamantia, MD
San Ysidro, CA · $103 in drug and device payments (2025) · (619) 917-7122
Dr. Ramon Sy, MD
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 428-4463
Dr. Ryan Pascua
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 205-4585
Dr. Sharonya Shrivastava
San Ysidro, CA · No drug or device payments recorded (2025) · (619) 662-4100
Dr. Alan Wong, M.D.
Saratoga, CA · No drug or device payments recorded (2025) · (408) 996-7336
Dr. Edward Levin, M.D.
Saratoga, CA · No drug or device payments recorded (2025) · (408) 741-5933
Dr. Mary Asano, M.D.
Saratoga, CA · $17 in drug and device payments (2025) · (408) 410-7087
Dr. Marc Dauer, M.D.
Saugus, CA · No drug or device payments recorded (2025) · (661) 799-1776
Dr. Bradly Jacobs, MD
Sausalito, CA · $19 in drug and device payments (2025) · (415) 339-2692
Dr. Carolyn Petersen, M.D.
Sausalito, CA · No drug or device payments recorded (2025) · (415) 521-0481
Dr. Keith Desrochers, MD
Sausalito, CA · $19 in drug and device payments (2025) · (415) 339-2692
Dr. Lawrence Posner, MD
Sausalito, CA · No drug or device payments recorded (2025) · (415) 683-2988
Dr. Matthew Meldorf, M.D.
Sausalito, CA · No drug or device payments recorded (2025) · (650) 296-6236
Dr. Michael Chase, MD
Sausalito, CA · No drug or device payments recorded (2025) · Telehealth · (415) 683-2988
Dr. Siegried Audfrey Chin, MD
Sausalito, CA · No drug or device payments recorded (2025) · (415) 683-2988
Dr. Darien Heron, M.D.
Scotts Valley, CA · No drug or device payments recorded (2025) · Telehealth · (831) 458-6330
Dr. Diane Mcgrew, MD
Scotts Valley, CA · No drug or device payments recorded (2025) · Telehealth · (831) 458-6330
Dr. Hailey Roumimper
Scotts Valley, CA · No drug or device payments recorded (2025) · Telehealth · (831) 458-6340
Dr. James Telfer, M.D.
Scotts Valley, CA · No drug or device payments recorded (2025) · (831) 458-6330
Dr. Marce Abare
Scotts Valley, CA · No drug or device payments recorded (2025) · (831) 438-2020
Dr. Rebecca Barker, MD
Scotts Valley, CA · $22 in drug and device payments (2025) · Telehealth · (831) 458-6330
Dr. Thanh Vu, MD
Scotts Valley, CA · $67 in drug and device payments (2025) · Telehealth · (831) 430-7203
Dr. Vincent Nguyen, DO
Scotts Valley, CA · $17 in drug and device payments (2025) · Telehealth · (831) 430-7203
Dr. Jaraad Huq
Seal Beach, CA · $19 in drug and device payments (2025) · Telehealth · (562) 493-9581
Dr. Sophia Chun, MD
Seal Beach, CA · $119 in drug and device payments (2025) · Telehealth · (562) 493-9581
Dr. Sullyvan Tang, M.D.
Seal Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 493-9581
Dr. David Ang, M.D.
Seaside, CA · No drug or device payments recorded (2025) · (831) 883-3809
Dr. Elif Sarihan, MD
Seaside, CA · No drug or device payments recorded (2025) · (831) 899-8100
Dr. Frank Chiu, MD
Seaside, CA · No drug or device payments recorded (2025) · (831) 883-3828
Dr. Harry Jang, MD
Seaside, CA · No drug or device payments recorded (2025) · (831) 899-8100
Dr. Mary Roberts, M.D.
Seaside, CA · No drug or device payments recorded (2025) · (831) 883-3820
Dr. Michael Kang, M.D.
Seaside, CA · No drug or device payments recorded (2025) · (831) 917-1573

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.