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Occupational Medicine in Ontario, California

Data updated monthly · Last refresh September 2026

3 Occupational Medicine providers practice in Ontario. Listings are drawn from federal public records and are not endorsements.

Occupational Medicine providers in Ontario

Listed alphabetically. 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. Gilbert Bush, MEDICAL DOCTOR
Ontario, CA · No drug or device payments recorded (2025) · (909) 460-4155
Dr. Patricia Fernandez, M.D.
Ontario, CA · No drug or device payments recorded (2025) · (909) 605-8888
Dr. William Downs, M.D.
Ontario, CA · No drug or device payments recorded (2025) · (615) 778-4066

Common questions

How many Occupational Medicine providers are in Ontario, California?

There are 3 Occupational Medicine providers with active NPI records practicing in Ontario, according to federal NPPES data refreshed monthly.

Where does this data come from?

Provider records 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.

All specialties in Ontario Occupational Medicine across California

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.