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Primary care physicians in Ontario, CA

The federal NPI Registry lists 55 primary care physicians with a practice address in Ontario, most of them along S Vineyard Ave and Concours. Featured: Axis Pain & Anesthesia Group, 31.0 miles away in Downey.

Call Axis 562-252-0816 Book online

Sponsored placement

SponsoredNearest office: Downey · 31.0 mi

Axis Pain & Anesthesia Group

Interventional pain management · Offices in Downey, Tarzana and Bakersfield

Back and neck pain, sciatica, spinal stenosis, facet and SI-joint pain, knee arthritis, migraines and occipital neuralgia, and pain after knee, shoulder or back surgery.

8207 E 3rd St, Unit 104, Downey, CA 90241

Procedures are performed at Downey Outpatient Surgery Center, owned by the same physician. Referring doctors can email records to [email protected] or call.

Call 562-252-0816Book online with Axis

Sponsored. Axis Pain & Anesthesia Group is a client of Shak Web Group, which publishes this site.

Ontario at a glance

residents (2023 Census estimate)
182,457
County
San Bernardino
registered primary care physicians with an office here
55
per 100,000 residents (area average 71.6)
30.1
ZIP with the most offices
91762

Registered 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.

Choosing a primary care physician in Ontario

  • Check the license with the Medical Board of California. DocInfo.org lists actions taken by state boards.
  • Ask whether the doctor is accepting new patients on your exact plan; HMO plans assign you to a primary care doctor.
  • Ask which hospital the doctor admits to and whether telehealth visits are offered.
  • Family medicine treats all ages; internal medicine treats adults only.

Near Ontario

Questions people ask

How many primary care physicians practice in Ontario?
The federal NPI Registry lists 55 primary care physicians with a practice address in Ontario, most of them along S Vineyard Ave and Concours. Source: CMS NPI Registry, practice-location addresses.
Which nearby cities have more options than Ontario?
Fontana (313, 9.5 mi), Pomona (215, 9.1 mi) and Corona (193, 12.3 mi).
Where is the closest Axis Pain & Anesthesia Group office to Ontario?
8207 E 3rd St, Unit 104, Downey, CA 90241, about 31.0 miles from Ontario. Call 562-252-0816 to book any office.
Does Axis treat accident patients on a lien?
Yes. Axis treats personal-injury patients on a medical lien signed by their attorney, so care can start before the case settles.

Talk to Axis, or send us a note

The fastest way is a call: 562-252-0816 books Downey, Tarzana or Bakersfield. Or leave your details and we will call you back.

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