Primary care physicians in Ontario, CA

Primary care physicians in Ontario

Alphabetical, from the federal NPI Registry (CMS), fetched 2026-11-05. Not a ranking or an endorsement; nobody pays to appear in this list. Confirm details with each office.

• Andrelee Taganas, MD

  Family Medicine

  2295 S Vineyard Ave Ste A · 91761

  909-427-7132

• Chao-ming Lin, MD

  Family Medicine

  2232 S Mountain Ave · 91762

  909-986-4692

• Charles Ho, MD

  Family Medicine

  2525 S Euclid Ave · 91762

  909-986-2288

• Daniel Tannous

  Family Medicine

  2295 S Vineyard Ave · 91761

  833-574-2273

• David Daniels, MD

  Internal Medicine

  3535 Inland Empire Blvd Suite 27 · 91764

  909-941-2572

• David Diep, DO

  Family Medicine

  2295 S Vineyard Ave Medical Office Building A - Family Medicine · 91761

  713-835-6235

• David Hirota, MD

  Internal Medicine

  3401 Centre Lake Dr Ste 512 · 91761

  909-566-0445

• Dianne Quintana, MD

  Internal Medicine

  2680 E Riverside Dr · 91761

  909-469-9013

• Eric Gureghian, MD

  Internal Medicine

  3990 Concours Suite 500 · 91764

  909-605-8000

• Fernando Avila

  Family Medicine

  2295 S Vineyard Ave · 91761

  833-574-2273

• Hetana Patel, MD

  Family Medicine

  4836 S Wilson Ave · 91762

  408-504-1051

• Hla Myint Maung Hwang, MD

  Internal Medicine, Nephrology

  1131 W 6th St Ste 150 · 91762

  909-482-4462

• Joanne Benzor, MD

  Family Medicine

  403 W F St · 91762

  909-988-3288

• Judith Cabrera, MD

  Family Medicine

  3401 Centre Lake Dr Ste 512 · 91761

  909-566-0445

• Kenneth Lee, MD

  Family Medicine

  4141 E Cielo Privado · 91761

  443-832-9673

• Kishan Thapar, MD

  Internal Medicine

  4150 Concours Ste 100 · 91764

  909-932-1045

• Liwanag Asuncion, MD

  Internal Medicine

  606 E Bermuda Dunes St · 91761

  440-225-7095

• Luis A Lomeli, MD

  Family Medicine

  527 N Palm Ave Suite 101 · 91762

  909-983-6622

• Maristella Cosip, FNP

  Family Medicine

  2624 E Harper St · 91762

  909-942-1864

• Mauricio Bonilla, MD

  Family Medicine

  1129 W 4th St · 91762

  909-363-9300

• Michaella Gaite, DO

  Family Medicine

  2295 S Vineyard Ave · 91761

  833-574-2273

• Naila Mubashar, MD

  Family Medicine

  437 N Euclid Ave · 91762

  909-988-2555

• Nicholas Ely, MD

  Family Medicine

  1129 W 4th St · 91762

  909-363-9300

• Orion Internal Medicine Associates, APC

  Internal Medicine · Practice / group

  1030 N Mountain Ave Suite#206 · 91762

  562-912-2690

• Rashmi Godugu, MD

  Family Medicine

  1131 W 6th St Ste 150 · 91762

  909-482-4462

• Renu Bhupathy, MD

  Family Medicine

  3990 Concours · 91764

  909-605-8000

• Rodman St. Clair, MD

  Internal Medicine

  3281 E Guasti Rd · 91761

  909-605-8015

• Rohin Talati, MD

  Family Medicine

  1650 S Euclid Ave · 91762

  909-467-0797

• Ruth Chambi - Hernandez, MD

  Family Medicine

  1871 E 4th St · 91764

  909-297-3337

• Saru Sachdeva, MD

  Internal Medicine, Rheumatology

  3990 Concours Ste 500 · 91764

  909-605-8000

• Sau Thong

  Family Medicine

  1109 W Francis St Apt D · 91762

  909-896-9292

• Sheila Marie Adan, DO

  Family Medicine

  2295 S Vineyard Ave · 91761

  909-724-5000

• Teodoro Diaz, DO

  Family Medicine

  3550 E Philadelphia St Suite 150 · 91761

  909-773-0022

• Vache Chakmakian, MD

  Family Medicine

  437 N Euclid Ave · 91762

  909-988-2555

• William Paley, DO

  Family Medicine

  437 N Euclid Ave · 91762

  909-988-2555

• Yan Zhang, MD

  Internal Medicine

  653 E E St Ste 107 · 91764

  626-991-0668

Plus 19 more registered in Ontario. Search them all at npiregistry.cms.hhs.gov.