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General Surgeons in California

Data updated monthly · Last refresh October 2026

3,111 Surgery providers practice in California, including 468 (15%) 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.

3,111providers
468telehealth
Los Angelestop city

Surgery by city in California

Choose a city to see providers there.

Surgery in Los Angeles260 providers
Surgery in San Francisco205 providers
Surgery in San Diego158 providers
Surgery in Sacramento106 providers
Surgery in Fresno67 providers
Surgery in Palo Alto64 providers
Surgery in Oakland60 providers
Surgery in Orange59 providers
Surgery in Riverside53 providers
Surgery in Loma Linda52 providers
Surgery in San Jose50 providers
Surgery in Torrance49 providers
Surgery in Stanford46 providers
Surgery in La Jolla43 providers
Surgery in Bakersfield40 providers
Surgery in Modesto35 providers
Surgery in Santa Monica35 providers
Surgery in Roseville35 providers
Surgery in Walnut Creek33 providers
Surgery in Newport Beach32 providers
Surgery in Beverly Hills31 providers
Surgery in Anaheim30 providers
Surgery in Pasadena27 providers
Surgery in West Hollywood24 providers

Surgery 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 Cloyd, M.D.
Escondido, CA · $69 in drug and device payments (2025) · (760) 489-5955
Dr. Dennis Nemceff, MD
Escondido, CA · $6,790 in drug and device payments (2025) · (760) 291-6650
Dr. Franklin Martin, M.D.
Escondido, CA · No drug or device payments recorded (2025) · (760) 489-1355
Dr. Gregory Campbell, M.D.
Escondido, CA · $5,577 in drug and device payments (2025) · (760) 740-6944
Dr. John Steele, M.D.
Escondido, CA · $69 in drug and device payments (2025) · (790) 489-5955
Dr. Ramin Sorkhi, M.D.
Escondido, CA · $36 in drug and device payments (2025) · (760) 291-6700
Dr. Robert Carrillo, MD
Escondido, CA · $135 in drug and device payments (2025) · (619) 995-3273
Dr. Sayed Bokhari, M.D.
Escondido, CA · $102 in drug and device payments (2025) · (760) 740-6944
Dr. Stefan Moldovan, M.D.
Escondido, CA · $6,119 in drug and device payments (2025) · Telehealth · (760) 739-7666
Dr. Syed Mousavi, MD
Escondido, CA · No drug or device payments recorded (2025) · (760) 294-1104
Dr. Thomas Velky, M.D.
Escondido, CA · No drug or device payments recorded (2025) · (760) 740-6944
Dr. Daniel Diamond, MD
Eureka, CA · $9,257 in drug and device payments (2025) · (707) 445-8121
Dr. Huy Trieu, M.D.
Eureka, CA · $2,682 in drug and device payments (2025) · Telehealth · (707) 443-2248
Dr. John Disiere, M.D.
Eureka, CA · No drug or device payments recorded (2025) · (707) 444-3885
Dr. John Vanspeybroeck, M.D.
Eureka, CA · No drug or device payments recorded (2025) · (707) 443-2248
Dr. Mary Mahoney, M.D.
Eureka, CA · $201 in drug and device payments (2025) · (707) 476-0690
Dr. Michael Palmer, M.D.
Eureka, CA · $329 in drug and device payments (2025) · Telehealth · (707) 445-3660
Dr. Thomas Loncar, M.D.
Eureka, CA · No drug or device payments recorded (2025) · (707) 442-8500
Dr. Thomas Rydz, M.D.
Eureka, CA · No drug or device payments recorded (2025) · Telehealth · (707) 445-3660
Dr. Behrouz Jamnani, M.D.
Fairfield, CA · No drug or device payments recorded (2025) · (707) 432-2600
Dr. Courtney Chambers, M.D.
Fairfield, CA · $137 in drug and device payments (2025) · (707) 646-4180
Dr. Haroon Mojaddidi, M.D.
Fairfield, CA · No drug or device payments recorded (2025) · (707) 432-2700
Dr. John Zopfi, D.O
Fairfield, CA · $360 in drug and device payments (2025) · (707) 646-4180
Dr. Majid Kianmajd, DO
Fairfield, CA · $2,696 in drug and device payments (2025) · (707) 646-4180
Dr. Robert Lanflisi, MD
Fairfield, CA · No drug or device payments recorded (2025) · (707) 426-4951
Dr. William Fulton, D.O.
Fairfield, CA · $1,556 in drug and device payments (2025) · Telehealth · (707) 646-4180
Dr. Karen Fogelberg, MD
Fair Oaks, CA · No drug or device payments recorded (2025) · (916) 843-7215
Dr. Robert Barrett, M.D.
Fair Oaks, CA · No drug or device payments recorded (2025) · (916) 962-1988
Dr. Melvyn Michaelian, M.D.
Fallbrook, CA · No drug or device payments recorded (2025) · (760) 728-6106
Dr. Robert Keenan, M.D.
Fallbrook, CA · No drug or device payments recorded (2025) · (951) 698-4650
Dr. Kathryn Amirikia, MD, FACS
Folsom, CA · $1,367 in drug and device payments (2025) · (916) 932-0315
Dr. Patrick O'malley, M.D.
Folsom, CA · No drug or device payments recorded (2025) · (916) 983-7121
Dr. William Kramer, D.O.
Folsom, CA · No drug or device payments recorded (2025) · (717) 364-0954
Dr. Chun Rhim, MD
Fontana, CA · $120 in drug and device payments (2025) · (909) 427-3910
Dr. Clifford Eke, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Daniel Klaristenfeld, MD
Fontana, CA · $13,500 in drug and device payments (2025) · (909) 427-3910
Dr. Darian Behseresht, MD
Fontana, CA · $728 in drug and device payments (2025) · (909) 609-2008
Dr. Jane Ong, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Joseph Ruan, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-5000
Dr. Jun Yamanishi, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Lawrence Harms, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Lori Chow, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Michael Shiffler, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Noel Victor, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Samir Johna, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Sheryl Kwak, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-6163
Dr. Siu-keung Chung, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-2460
Dr. Steven Wenzel, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Taylor Ho, MD
Fontana, CA · $113 in drug and device payments (2025) · (909) 427-3910
Dr. Charles Jenkins, MD
Fort Bragg, CA · No drug or device payments recorded (2025) · (707) 961-1234

Common questions

How many Surgery providers are in California?

There are 3,111 Surgery providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Surgery providers in California offer telehealth?

Yes. 468 of the 3,111 Surgery providers in California (about 15%) report offering telehealth services in CMS data.

Which cities in California have the most Surgery providers?

Los Angeles (260), San Francisco (205), San Diego (158) have the highest concentration of Surgery providers in California.

How many Surgery providers in California received drug or device company payments?

1,519 of 3,111 Surgery providers in California (49%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

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 General Surgeons in California work in independent practices or large health systems?

Among 1,794 General Surgeons in California enrolled in Medicare, 24% bill through a solo or small practice with fewer than 10 clinicians, 14% through a mid-size group of 10 to 99, and 62% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do General Surgeons in California work at?

According to CMS facility affiliation records, the California hospitals where the most General Surgeons 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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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 Surgery in California? Get featured.