Occupational Medicine Doctors in California
Data updated monthly · Last refresh October 2026
414 Occupational Medicine providers practice in California, including 8 (2%) offering telehealth. The largest concentration is in San Diego. 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.
414providers
8telehealth
San Diegotop city
Occupational Medicine by city in California
Choose a city to see providers there.
Occupational 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. Wayne Chang, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 880-7812 Dr. David Mckinney, MDOroville, CA · No drug or device payments recorded (2025) ·
(530) 534-5135 Dr. Michael Byer, M.D.Oxnard, CA · No drug or device payments recorded (2025) ·
(805) 988-3200 Dr. Steven Madhavan, MD, MPHOxnard, CA · No drug or device payments recorded (2025) · Telehealth ·
(805) 988-3200 Dr. Prerna Khanna, MDPalm Springs, CA · $19 in drug and device payments (2025) ·
(214) 629-0339 Dr. Ronit Katz, MDPalo Alto, CA · $74 in drug and device payments (2025) ·
(650) 493-5000 Dr. John Harbaugh, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Rafael Gonzalez, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Taha Ahmad, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Nicole Pham-bailey, MDPasadena, CA · No drug or device payments recorded (2025) ·
(626) 405-2681 Dr. Robert Estrada, MDPasadena, CA · No drug or device payments recorded (2025) ·
(818) 354-5680 Dr. Patricia Alexander, O.T.R./LPaso Robles, CA · No drug or device payments recorded (2025) ·
(805) 237-0272 Dr. Dennis Pocekay, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Robert Fried, MDPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3900 Dr. Shane LavinPetaluma, CA · No drug or device payments recorded (2025) ·
(707) 765-3800 Dr. Joel Canga, M.D.Pittsburg, CA · No drug or device payments recorded (2025) ·
(925) 439-6169 Dr. Chao Sun, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 915-9530 Dr. Stephen Nord, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 520-0055 Dr. Brian BallardPomona, CA · No drug or device payments recorded (2025) · Telehealth ·
(095) 964-3469 Dr. Leon Bybee, M.D.Pomona, CA · No drug or device payments recorded (2025) ·
(615) 778-4066 Dr. Rudolf Iskandar, M.D.Rancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 635-3570 Dr. Amarilda Christensen, M.D.Rancho Cucamonga, CA · $31 in drug and device payments (2025) ·
(909) 297-5070 Dr. Artemio Martin, M.D.Rancho Cucamonga, CA · No drug or device payments recorded (2025) ·
(615) 778-4066 Dr. James Mitchner, MDRancho Cucamonga, CA · No drug or device payments recorded (2025) ·
(909) 481-7345 Dr. Leonardo Rasi, M.D.Rancho Cucamonga, CA · $28 in drug and device payments (2025) ·
(615) 778-4066 Dr. Paul Umof, M.D.Rancho Cucamonga, CA · No drug or device payments recorded (2025) ·
(909) 481-7345 Dr. Michael Schkloven, MDRancho Dominguez, CA · No drug or device payments recorded (2025) ·
(310) 637-9611 Dr. Lawrence Earl, MDRancho Mirage, CA · $100 in drug and device payments (2025) ·
(908) 879-7730 Dr. Charity Russell, MDRedlands, CA · No drug or device payments recorded (2025) ·
(909) 894-7938 Dr. Anthony Dubose, M.DRedwood City, CA · No drug or device payments recorded (2025) ·
(650) 556-9420 Dr. Arnold Bunyaviroch, MDRedwood City, CA · No drug or device payments recorded (2025) ·
(650) 299-2000 Dr. James Boyle, MDRedwood City, CA · No drug or device payments recorded (2025) ·
(650) 299-2000 Dr. Wali Jahangiri, MDRedwood City, CA · No drug or device payments recorded (2025) ·
(650) 299-4785 Dr. Alina Walasek, M.D.Richmond, CA · No drug or device payments recorded (2025) ·
(510) 307-1500 Dr. Lawrence Piazza, M.D.Richmond, CA · No drug or device payments recorded (2025) ·
(510) 222-8000 Dr. Michael Zhang, MDRichmond, CA · No drug or device payments recorded (2025) ·
(510) 307-1500 Dr. Roman Kownacki, MDRichmond, CA · No drug or device payments recorded (2025) ·
(510) 307-1500 Dr. Craig Clark, PA-CRiverside, CA · No drug or device payments recorded (2025) ·
(951) 341-9333 Dr. Dana Johnson, MDRiverside, CA · No drug or device payments recorded (2025) ·
(909) 353-2000 Dr. Gerald West Jr., MDRiverside, CA · No drug or device payments recorded (2025) ·
(909) 353-2000 Dr. Howard Waters, M.D.Riverside, CA · No drug or device payments recorded (2025) ·
(951) 653-5291 Dr. William Montgomery, MDRiverside, CA · No drug or device payments recorded (2025) ·
(951) 222-2206 Dr. Zaid Al-faham, M.D., MPHRiverside, CA · No drug or device payments recorded (2025) ·
(951) 781-2200 Dr. Peter Heitke, M.D.Rocklin, CA · No drug or device payments recorded (2025) ·
(916) 632-9606 Dr. Howard Ballinger, MDRohnert Park, CA · No drug or device payments recorded (2025) ·
(707) 206-3000 Dr. Anya Myers, D.ORoseville, CA · No drug or device payments recorded (2025) ·
(916) 784-4000 Dr. John Jay Betz, MDRoseville, CA · No drug or device payments recorded (2025) ·
(916) 797-4700 Dr. Michael Cohen, MDRoseville, CA · No drug or device payments recorded (2025) ·
(916) 797-4700 Dr. Michael Tenison, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 780-0110 Dr. Catherine Boomus, M.D.Rossmoor, CA · No drug or device payments recorded (2025) ·
(562) 355-0540 Common questions
How many Occupational Medicine providers are in California?There are 414 Occupational Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Occupational Medicine providers in California offer telehealth?Yes. 8 of the 414 Occupational Medicine providers in California (about 2%) report offering telehealth services in CMS data.
Which cities in California have the most Occupational Medicine providers?San Diego (37), San Francisco (24), Los Angeles (23) have the highest concentration of Occupational Medicine providers in California.
How many Occupational Medicine providers in California received drug or device company payments?44 of 414 Occupational Medicine providers in California (11%) 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.
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