700 Internists Found in Ontario, CA – Page 4

We found 700 Internists available in Ontario, CA with an average 4 stars across 4,130 reviews. Find the best one for your needs by years of experience, distance, reviews on Vitals, and more through the filters provided below. Currently, 329 Internists listed are accepting new patients and 295 accept Medicare. Showing 181 to 240 of 700 Internists.

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Featured Results

Trisha Khanna, MD, FAAD

Dermatology
Spent time with me
8 years exp
Accepting New Patients
Virtual Visit available
Orlando, FL
"Dr. Trisha Khanna was incredibly compassionate and reassuring during a very stressful time for me." View Profile

Dr. Tooba Rehman, MD

Internal Medicine
16 years exp
Accepting New Patients
Virtual Visit available
Katy, TX
Dr. Tooba Rehman is a board-certified Internal Medicine physician and the founder of Doc & Me Health, a direct primary care practice built on a membership model that replaces rushed, insurance-driven visits with unhurried, relationship-first care. View Profile

Dr. Roopa Chari, MD

Integrative Medicine
Staff was courteous
1 Award
31 years exp
Accepting New Patients
Virtual Visit available
Encinitas, CA
"Working with Dr. Roopa Chari has made a big difference in how I feel day to day." View Profile

Dr. Daniel Benhuri, MD

Internal Medicine
8 years exp
Accepting New Patients
Virtual Visit available
Beverly Hills, CA
Meet Dr. Daniel Benhuri, MD: Your Primary Care Physician at Dr. Daniel Benhuri, MDAbout Dr. BenhuriDr. Daniel Benhuri, MD, is a board-certified internal medicine and primary care physician dedicated to providing exceptional healthcare to families in Beverly Hills, California. View Profile

Yves Chery, CT, ASCP, APRN, BSN, MSN

Family Medicine
Provided follow-up after the visit
Accepting New Patients
Virtual Visit available
SUWANEE, GA
"He radiates warmth and kindness. I have never felt so heard and respected by a medical professional. Great experience and I highly recommend him." View Profile

Dr. Tracy Ching-Hue Burton

Pediatrics
18 years exp
Accepting New Patients
Virtual Visit available
Franklin, TN
Dr. Tracy Burton is a Board-Certified Pediatrician with over 10 years of experience providing expert care to children and families as the Chief Medical Officer at As You Are. View Profile

Karthikeyan Viswanathan, DO

Internal Medicine
12 years exp
Accepting New Patients
Virtual Visit available
Los Altos, CA
Dr. Karthikeyan Viswanathan, DO, is a physician who brings a unique perspective to medicine through his diverse professional background. View Profile

Dr. Alaa Hajal, MD

Internal Medicine
15 years exp
Accepting New Patients
Virtual Visit available
Diamond Bar, CA
Dr. Alaa Hajal is redefining the primary care experience at La Vista Medical Center, serving as a cornerstone of health and vitality for the Diamond Bar community. View Profile

All Results

Dr. Mihee Park, MD

Oncology
11 years exp
Ontario, CA1.7 mi
Dr. Dr. Mihee Park, MD is a health care provider primarily located in Ontario, CA. She has 11 years of experience. Her specialties include Internal Medicine, Oncology, Hematology. View Profile

Dr. Jonathan Ilyong Lo, MD

Internal Medicine
29 years exp
Ontario, CA1.7 mi
Dr. Dr. Jonathan Ilyong Lo, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Long Beach, CA. He has 29 years of experience. View Profile

Dr. Anil Chandru Jagtiani, MD

Infectious Disease
15 years exp
Ontario, CA1.7 mi
Dr. Dr. Anil Chandru Jagtiani, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 15 years of experience. View Profile

Dr. Ragu Sivarajan, MD

Internal Medicine
13 years exp
Ontario, CA1.7 mi
Dr. Dr. Ragu Sivarajan, MD is a health care provider primarily located in Ontario, CA. He has 13 years of experience. His specialties include Internal Medicine, Hospital Medicine. View Profile

Dr. David Chung Wei Wang, MD

Internal Medicine
12 years exp
Ontario, CA1.7 mi
Dr. Dr. David Chung Wei Wang, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 12 years of experience. View Profile

Dr. Ahmereen Azim Khan, MD

Internal Medicine
26 years exp
Ontario, CA1.7 mi
Dr. Dr. Ahmereen Azim Khan, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. She has 26 years of experience. View Profile

Dr. Edmond C Hui, MD

Internal Medicine
36 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Edmond C Hui, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Ontario, CA. He has 36 years of experience. View Profile

Dr. Paul Lim, MD

Internal Medicine
35 years exp
Ontario, CA1.7 mi
Dr. Dr. Paul Lim, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 35 years of experience. View Profile

Dr. Edward Orville Blews III, MD

Pediatrics
19 years exp
Ontario, CA1.7 mi
Dr. Dr. Edward Orville Blews, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 19 years of experience. View Profile

Dr. Janet Cheryl Yang, MD

Gastroenterology
22 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Janet Cheryl Yang, MD is a health care provider primarily located in Ontario, CA, with other offices in Los Angeles, CA and Los Angeles, CA(and 2 other locations). View Profile

Dr. Gregory Thomas Havlena, MD

Vascular & Interventional Radiology
17 years exp
Ontario, CA1.7 mi
Dr. Dr. Gregory Thomas Havlena, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 17 years of experience. View Profile

Dr. Sunil Ramnani, MD

Internal Medicine
36 years exp
Ontario, CA1.7 mi
Dr. Dr. Sunil Ramnani, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Bakersfield, CA(and 2 other locations). View Profile

Dr. Muhammad Tajbaz Khan, MD

Internal Medicine
26 years exp
Ontario, CA1.7 mi
Dr. Dr. Muhammad Tajbaz Khan, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 26 years of experience. View Profile

Dr. Miten Vasa, MD

Rheumatology
19 years exp
Ontario, CA1.7 mi
Dr. Dr. Miten Vasa, MD is a health care provider primarily located in Ontario, CA. He has 19 years of experience. His specialties include Internal Medicine, Rheumatology. View Profile

Dr. Tarik Ahmed Hussein, MD

Hospital Medicine
24 years exp
Ontario, CA1.7 mi
Dr. Dr. Tarik Ahmed Hussein, MD is a health care provider primarily located in Ontario, CA, with other offices in Hemet, CA and Fontana, CA(and 2 other locations). View Profile

Dr. Jan Michael Herrman, MD

Nephrology
46 years exp
Ontario, CA1.7 mi
Dr. Dr. Jan Michael Herrman, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 46 years of experience. View Profile

Dr. Charles Ihong Lu, MD

Nephrology
31 years exp
Ontario, CA1.7 mi
Dr. Dr. Charles Ihong Lu, MD is a health care provider primarily located in Ontario, CA, with another office in Fontana, CA. He has 31 years of experience. View Profile

Dr. Dat Man Ha, DO

Endocrinology, Diabetes & Metabolism
16 years exp
Ontario, CA1.7 mi
Dr. Dr. Dat Man Ha, DO is a health care provider primarily located in Ontario, CA. He has 16 years of experience. View Profile

Dr. Jessica Keeyoung Hong

Internal Medicine
11 years exp
Ontario, CA1.7 mi
Dr. Dr. Jessica Keeyoung Hong is a health care provider primarily located in Ontario, CA. She has 11 years of experience. View Profile

Dr. Jessica Ekomerei Obi

Internal Medicine
6 years exp
Ontario, CA1.7 mi
Dr. Dr. Jessica Ekomerei Obi is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. She has 6 years of experience. View Profile

Dr. Ahmad Salman Adam

Internal Medicine
7 years exp
Ontario, CA1.7 mi
Dr. Dr. Ahmad Salman Adam is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 7 years of experience. View Profile

Dr. Jogaratnam Vernidharan

Family Medicine
36 years exp
Ontario, CA1.7 mi
Dr. Dr. Jogaratnam Vernidharan is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 36 years of experience. View Profile

Dr. Mehrnaz Salehidobakhshari

Internal Medicine
18 years exp
Ontario, CA1.7 mi
Dr. Dr. Mehrnaz Salehidobakhshari is a health care provider primarily located in Ontario, CA, with other offices in Evanston, IL and Ontario, CA. She has 18 years of experience. View Profile

Dr. Esther Yeajin Kwon, MD

Geriatric Medicine
13 years exp
Ontario, CA1.7 mi
Dr. Dr. Esther Yeajin Kwon, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Diamond Bar, CA. She has 13 years of experience. View Profile

Dr. Nehali Dushyantbha Patel, MD

Gastroenterology
18 years exp
Ontario, CA1.7 mi
Dr. Dr. Nehali Dushyantbha Patel, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. She has 18 years of experience. View Profile

Dr. Athena Theresa Alexander, MD

Internal Medicine
13 years exp
Ontario, CA1.7 mi
Dr. Dr. Athena Theresa Alexander, MD is a health care provider primarily located in Ontario, CA. She has 13 years of experience. Her specialties include Internal Medicine. View Profile

Dr. Andrew Chen Cha, DO

Internal Medicine
23 years exp
Ontario, CA1.7 mi
Dr. Dr. Andrew Chen Cha, DO is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 23 years of experience. View Profile

Dr. Matthew Charles Edwards

Internal Medicine
6 years exp
Ontario, CA1.7 mi
Dr. Dr. Matthew Charles Edwards is a health care provider primarily located in Ontario, CA, with another office in Loma Linda, CA. He has 6 years of experience. View Profile

Dr. Lev Rasin, MD

Internal Medicine
47 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Lev Rasin, MD is a health care provider primarily located in Ontario, CA, with other offices in Fontana, CA and Ontario, CA. He has 47 years of experience. View Profile

Dr. Su S Hline, MD

Nephrology
39 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Su S Hline, MD is a health care provider primarily located in Ontario, CA, with other offices in Fontana, CA and Rancho Cucamonga, CA. She has 39 years of experience. View Profile

Dr. Michael Seung Oh, MD

Neurology
18 years exp
Ontario, CA1.7 mi
Dr. Dr. Michael Seung Oh, MD is a health care provider primarily located in Ontario, CA. He has 18 years of experience. His specialties include Internal Medicine, Neurology. View Profile

Dr. Wei Lin Chen, DO

Internal Medicine
18 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Wei Lin Chen, DO is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Arcadia, CA. He has 18 years of experience. View Profile

Dr. Isil Uzun Smith

Internal Medicine
15 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Isil Uzun Smith is a health care provider primarily located in Ontario, CA, with other offices in Arcadia, CA and Arcadia, CA(and 2 other locations). View Profile

Dr. Sheena Dhadwal

Internal Medicine
10 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Dr. Sheena Dhadwal is a health care provider primarily located in Ontario, CA, with other offices in Torrance, CA and Downey, CA(and 2 other locations). View Profile

Dr. Alison Shin-Hwa Taur, MD

Nuclear Medicine
35 years exp
Ontario, CA1.8 mi
Dr. Dr. Alison Shin-Hwa Taur, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. She has 35 years of experience. View Profile

Dr. Kyung Park Chung

Internal Medicine
41 years exp
Ontario, CA2.3 mi
Dr. Dr. Kyung Park Chung is a health care provider primarily located in Ontario, CA. She has 41 years of experience. Her specialties include Internal Medicine. View Profile

Dr. Richard Craig Mccauley, MD

Internal Medicine
35 years exp
Accepting New Patients
Ontario, CA2.5 mi
Dr. Dr. Richard Craig Mccauley, MD is a health care provider primarily located in Ontario, CA, with other offices in Visalia, CA and Richmond, CA(and 6 other locations). View Profile

Dr. Rafiq Mohammad Muqri

Internal Medicine
29 years exp
Ontario, CA2.6 mi
Dr. Dr. Rafiq Mohammad Muqri is a health care provider primarily located in Ontario, CA. He has 29 years of experience. His specialties include Internal Medicine. View Profile

Dr. Jason C Chow, MD

Internal Medicine
10 years exp
Accepting New Patients
Ontario, CA2.8 mi
Dr. Dr. Jason C Chow, MD is a health care provider primarily located in Ontario, CA, with other offices in Redlands, CA and Redlands, CA(and 9 other locations). View Profile

Dr. Rodman Allen St Clair JR., MD

Internal Medicine
50 years exp
Ontario, CA2.9 mi
Dr. Dr. Rodman Allen St Clair, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Palm Springs, CA. He has 50 years of experience. View Profile

Dr. Nasrin Kazemi

Internal Medicine
26 years exp
Accepting New Patients
Ontario, CA2.9 mi
Dr. Dr. Nasrin Kazemi is a health care provider primarily located in Ontario, CA, with other offices in Loma Linda, CA and Loma Linda, CA(and 4 other locations). View Profile

Dr. Prem N Reddy

Cardiovascular Disease
52 years exp
Ontario, CA3.3 mi
Dr. Dr. Prem N Reddy is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and National City, CA. He has 52 years of experience. View Profile

Dr. Ronald Dungca Ortizo

Gastroenterology
11 years exp
Accepting New Patients
Ontario, CA3.9 mi
Dr. Dr. Ronald Dungca Ortizo is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Riverside, CA(and 6 other locations). View Profile

Dr. Lawrence Gerald Krugman, MD

Endocrinology, Diabetes & Metabolism
Ontario, CA3.9 mi
Dr. Dr. Lawrence Gerald Krugman, MD is a health care provider primarily located in Ontario, CA. Their specialties include Internal Medicine, Endocrinology, Diabetes & Metabolism. View Profile

Dr. Atonis Pax, MD

Internal Medicine
25 years exp
Accepting New Patients
Ontario, CA4.0 mi
Dr. Dr. Atonis Pax, MD is a health care provider primarily located in Ontario, CA, with other offices in Corona, CA and Riverside, CA(and 6 other locations). View Profile

Dr. Abraham V. Shammas

Ophthalmology
43 years exp
Accepting New Patients
San Dimas, CA12.3 mi
"Love that the procedure was so quick and minimum downtime." View Profile

Dr. Sandra Siewpin Lee, MD

Dermatology
28 years exp
Accepting New Patients
Upland, CA3.4 mi
Dr. Dr. Sandra Siewpin Lee, MD is a health care provider primarily located in Upland, CA, with another office in Upland, CA. She has 28 years of experience. View Profile

Dr. Glenn Yukio Miya, MD

Internal Medicine
37 years exp
Upland, CA3.4 mi
"Dr. Miya was out family Dr. for more than 20 years." View Profile

Dr. Amit Ishwarbhai Patel, MD

Allergy & Immunology
49 years exp
Accepting New Patients
Upland, CA4.1 mi
"He took the time to explain all my results of my allergy testing and ct scan in a way I could understand. He is very informative and very thorough." View Profile

Dr. Samir Issa Anabi, MD

Internal Medicine
40 years exp
Accepting New Patients
Upland, CA3.4 mi
"Dr. Anabi took care of my father the last 8 or 9 years of his long life. " View Profile

Dr. Tony Kastoon, MD

Endocrinology, Diabetes & Metabolism
28 years exp
Accepting New Patients
Upland, CA3.4 mi
Dr. Dr. Tony Kastoon, MD is a health care provider primarily located in Upland, CA, with other offices in Upland, CA and San Bernardino, CA(and 4 other locations). View Profile

Dr. Jaffar Abbas Tremazi, MD

Rheumatology
28 years exp
Accepting New Patients
Upland, CA3.4 mi
Dr. Dr. Jaffar Abbas Tremazi, MD is a health care provider primarily located in Upland, CA, with other offices in Pomona, CA and Pomona, CA(and 2 other locations). View Profile

Dr. Stuart Charles Seigel, MD

Endocrinology, Diabetes & Metabolism
18 years exp
Accepting New Patients
Rancho Cucamonga, CA3.5 mi
"I always have such a positive experience at my visits with him. he is so encouraging and has helped me improve my condition. This is the healthiest I have been in years!" View Profile

Dr. Bashar G Saad, MD

Endocrinology, Diabetes & Metabolism
39 years exp
Accepting New Patients
Upland, CA3.4 mi
Dr. Dr. Bashar G Saad, MD is a health care provider primarily located in Upland, CA, with other offices in San Bernardino, CA and Glendora, CA(and 3 other locations). View Profile

Dr. Rohinder Kaur Sandhu, MD

Critical Care Medicine
46 years exp
Accepting New Patients
Upland, CA3.5 mi
"Great Doctor!" View Profile

Dr. Sadiq Lafta Altamimi, MD

Neurology
22 years exp
Upland, CA3.4 mi
"We didn’t see the dr today because they apparently called and left a message to do a telehealth visit. We went to the office not knowing this. Office is filthy." View Profile

Dr. Karin Chen Li, MD

Internal Medicine
22 years exp
Chino, CA3.9 mi
Dr. Dr. Karin Chen Li, MD is a health care provider primarily located in Chino, CA, with another office in Chino, CA. She has 22 years of experience. View Profile

Dr. Daryoosh Valamanesh, MD

Endocrinology, Diabetes & Metabolism
47 years exp
Upland, CA3.4 mi
"I first met Doctor Valamanesh as he woke me out of my coma. I had been placed in a coma due to intense pain. That was 13 years ago now and he is now my PCP." View Profile

Dr. Mao-Jin Fu, MD

Family Medicine
57 years exp
Chino, CA3.8 mi
"Dr. Fu has been my doctor for many, many years. He is a wonderful doctor and his staff are great!" View Profile

Dr. Faramarz Alav, MD

Internal Medicine
46 years exp
Accepting New Patients
Upland, CA3.4 mi
"Dr Alav staff are polite, professional, hard working and caring. Like I mentioned before I would refer friends and family." View Profile

What is an Internist and How Can They Help You?

An internist specializes in adult medicine, providing comprehensive care for complex medical conditions. These physicians excel at diagnosing challenging cases and managing patients with multiple organ system involvement.

Internists complete medical school and a three-year internal medicine residency. Many pursue subspecialty fellowship training in fields such as cardiology, gastroenterology, or infectious disease, though general internists maintain broad adult medical expertise.

An Internist's clinical practice encompasses:

  • Concentrates on adult patient populations and multi-system medical management
  • Conducts medical history reviews, physical assessments, diagnostic test interpretation
  • Manages metabolic disorders, cardiovascular disease, pulmonary conditions, infectious processes, and immune-mediated diseases
  • Employs pharmaceutical management, preventive medicine, health counseling, and specialist coordination
  • Alternative titles: adult medicine specialist, general internist, MD, DO

Frequently Asked Questions

What's the best way to search for an Internist in Ontario who accepts my health insurance?
Navigate to the insurance filter located at the top of the search page and select your health plan. This will display only Internists in Ontario who are in-network with your carrier. For additional confirmation, visit each doctor's profile or reach out to their office by phone.
Where can I find Internists in Ontario who offer virtual appointments?
Select the "Virtual Visit" filter at the top of the search page to see Internists providing telehealth services in Ontario. Check each doctor's profile for video visit options and online scheduling availability. You may also call their office to set up a remote consultation.
What's the easiest way to locate highly-rated Internists in Ontario?
Use the "Ratings" filter at the top of the search page to filter results by the average star rating. Browse individual profiles to see patient reviews and ratings in detail. When comparing Internists, look at both the average star rating and how many patients have submitted reviews.
Is it possible to schedule a same-day visit with an Internist in Ontario?
Visit individual doctor profiles to see their current scheduling availability in Ontario. If you don't see same-day openings listed online, try calling their office—walk-in times may be available that don't appear on the website.
Which Internists in Ontario have the shortest wait times?
Review the Ratings & Reviews card on each provider's profile to see their average wait time in Ontario. This helps you find an Internist that doesn’t make their patients wait too long.
Can I schedule appointments with Internists in Ontario without calling?
Search for Internists who have "Book Online" or "Request Now" options on their profiles. Click these buttons to access online appointment scheduling. If a provider doesn't offer web-based booking, their phone number will be available for traditional scheduling.
How do I locate an Internist in Ontario with evening or weekend hours?
Check the Locations card on each profile to view office hours for Internists in Ontario. This helps you find providers with non-traditional availability. For the most accurate information about extended availability, call the office directly.
How do I leave feedback about my appointment with an Internist in Ontario?
Go to your doctor's profile page and click the "Leave a Review" button or link. You can share your rating and write about your experience. Patient reviews like yours help others in the community choose the right Internist.
How can I locate an Internist in Ontario who is fluent in my preferred language?
Review the language information displayed on individual profiles for Internists. If this information isn't available online, contact the office directly to ask about the doctor's language capabilities or whether interpreters are available.
How do I search for an Internist in Ontario who works at a particular hospital or medical center?
Check the "Hospital Affiliation" and "Locations" sections on each provider's profile to see where Internists practice. You can also enter a specific hospital or medical group name into the search tool to find Internists who work there.

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Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.