697 Internists Found in Ontario, CA – Page 3

We found 697 Internists available in Ontario, CA with an average 4 stars across 4,002 reviews. Find the best one for your needs by years of experience, distance, reviews on Vitals, and more through the filters provided below. Currently, 335 Internists listed are accepting new patients and 295 accept Medicare. Showing 121 to 180 of 697 Internists.

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Featured Results

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

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

Trisha Khanna, MD, FAAD

Dermatology
Gave an accurate diagnosis
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. Karanbir Brar

Geriatric Medicine
Flexible scheduling
16 years exp
Accepting New Patients
Virtual Visit available
Oceanside, CA
"I am always looking for doctors who are focused on prevention and providing the highest level of care and concern, Dr, Brar was extremely well intentioned in his ability to guide me to certain tests and health strategies to get some of my markers under control and also recc some advanced new tests to truly allow us to establish a strong prevention plan." View Profile

Dr. Tamar Heisler

Pediatrics
18 years exp
Accepting New Patients
Virtual Visit available
Franklin, TN
Dr. Tami Heisler is a Board-Certified Pediatrician with over 10 years of experience providing compassionate and personalized care to children and their families 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. George Mousa, MD

Internal Medicine
17 years exp
Accepting New Patients
Virtual Visit available
Upland, CA
Dr. George Mousa specializes in preventive care and chronic disease management within Internal Medicine. View Profile

Dr. Virginia Von Schaefer, MD

Oncology
Flexible scheduling
43 years exp
Accepting New Patients
Virtual Visit available
San Clemente, CA
"As I sit here in the VVS MD IV treatment room with 3 other patients, we are all sharing our stories." View Profile

All Results

Dr. Daniel Soo Seid, MD

Internal Medicine
39 years exp
Ontario, CA1.7 mi
Dr. Daniel Soo Seid, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Huntington Beach, CA. He has 39 years of experience. View Profile

Dr. Antony Tehui Lin, MD

Rheumatology
30 years exp
Ontario, CA1.7 mi
Dr. Antony Tehui Lin, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 30 years of experience. View Profile

Dr. Joseph Lihkang Yeh, MD

Gastroenterology
18 years exp
Ontario, CA1.7 mi
Dr. Joseph Lihkang Yeh, MD is a health care provider primarily located in Ontario, CA, with another office in Fontana, CA. He has 18 years of experience. View Profile

Dr. Timothy Daniel Jenkins, MD

Gastroenterology
34 years exp
Ontario, CA1.7 mi
Dr. Timothy Daniel Jenkins, MD is a health care provider primarily located in Ontario, CA. He has 34 years of experience. View Profile

Dr. Thomas Homing Fong, MD

Oncology
25 years exp
Ontario, CA1.7 mi
"Explains medical information in a way that patients can understand. Takes time to answer questions and concerns." View Profile

Dr. Arti Jayant Choure, MD

Internal Medicine
23 years exp
Ontario, CA1.7 mi
Dr. Arti Jayant Choure, MD is a health care provider primarily located in Ontario, CA. She has 23 years of experience. View Profile

Dr. Timothy Tingchang Kuo, MD

Gastroenterology
27 years exp
Ontario, CA1.7 mi
Dr. Timothy Tingchang Kuo, MD is a health care provider primarily located in Ontario, CA, with another office in Fontana, CA. He has 27 years of experience. View Profile

Dr. Payam Vali Morgan, MD

Ophthalmology
17 years exp
Ontario, CA1.7 mi
Dr. Payam Vali Morgan, 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. Elenita C Silva-Aquino, MD

Internal Medicine
42 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Elenita C Silva-Aquino, MD is a health care provider primarily located in Ontario, CA, with other offices in Downey, CA and Fontana, CA(and 3 other locations). View Profile

Dr. Lisa My An Tran, MD

Addiction Medicine
24 years exp
Ontario, CA1.8 mi
Dr. Lisa My An Tran, MD is a health care provider primarily located in Ontario, CA. They have 24 years of experience. View Profile

Dr. Sunilkumar J Patel, MD

Oncology
41 years exp
Ontario, CA1.8 mi
"Dr.giil was an amazing, amazing staff, she was caring and made me feel safe, I would recommend her to everyone" View Profile

Dr. Ossama Fouad Maloule, MD

Infectious Disease
31 years exp
Ontario, CA1.4 mi
Dr. Ossama Fouad Maloule, MD is a health care provider primarily located in Ontario, CA, with other offices in Pomona, CA and Ontario, CA(and 3 other locations). View Profile

Dr. Tejk Naik, MD

Critical Care Medicine
24 years exp
Ontario, CA1.7 mi
Dr. Tejk Naik, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 24 years of experience. View Profile

Dr. Udoh Onyima Obioha, MD

Internal Medicine
47 years exp
Accepting New Patients
Ontario, CA1.5 mi
Dr. Udoh Onyima Obioha, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Ontario, CA(and 3 other locations). View Profile

Dr. Steven Bradley Harris, MD

Geriatric Medicine
43 years exp
Ontario, CA2.0 mi
Dr. Steven Bradley Harris, MD is a health care provider primarily located in Ontario, CA. He has 43 years of experience. View Profile

Dr. Helen Heng-Shan Moon, MD

Oncology
23 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Helen Heng-Shan Moon, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Los Angeles, CA(and 2 other locations). View Profile

Dr. David Changshung Liu, MD

Internal Medicine
30 years exp
Ontario, CA1.7 mi
Dr. David Changshung Liu, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 30 years of experience. View Profile

Dr. Moustapha Abidali, DO

Critical Care Medicine
Accepting New Patients
Ontario, CA1.4 mi
Dr. Moustapha Abidali, DO is a health care provider primarily located in Ontario, CA, with other offices in San Dimas, CA and Baldwin Park, CA(and 11 other locations). View Profile

Dr. Joseph Abraham Gordon, MD

Critical Care Medicine
14 years exp
Ontario, CA1.4 mi
Dr. Joseph Abraham Gordon, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Upland, CA. He has 14 years of experience. View Profile

Dr. David Herbert Daniels, MD

Internal Medicine
59 years exp
Accepting New Patients
Ontario, CA3.4 mi
Dr. David Herbert Daniels, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 59 years of experience. View Profile

Dr. Jacquelyn Yen Nguyen, MD

Nephrology
20 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Jacquelyn Yen Nguyen, MD is a health care provider primarily located in Ontario, CA, with other offices in Sylmar, CA and Redlands, CA. She has 20 years of experience. View Profile

Dr. Jinghua Wang

Internal Medicine
35 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Jinghua Wang is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Fontana, CA(and 2 other locations). View Profile

Dr. Charles Nguyen, MD

Nephrology
15 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Charles Nguyen, MD is a health care provider primarily located in Ontario, CA, with other offices in Downey, CA and Riverside, CA(and 10 other locations). View Profile

Dr. Heeten Vasudev Bhoot, MD

Nephrology
11 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Heeten Vasudev Bhoot, MD is a health care provider primarily located in Ontario, CA, with other offices in NORCO, CA and Riverside, CA(and 12 other locations). View Profile

Dr. Faraz Afridi, MD

Internal Medicine
15 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Faraz Afridi, MD is a health care provider primarily located in Ontario, CA, with other offices in Riverside, CA and Irvine, CA(and 10 other locations). View Profile

Dr. Nitin Bhasin, MD

Nephrology
19 years exp
Ontario, CA1.4 mi
Dr. Nitin Bhasin, MD is a health care provider primarily located in Ontario, CA, with other offices in Covina, CA and Ontario, CA(and 18 other locations). View Profile

Dr. Calvin Andrew He, DO

Critical Care Medicine
8 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Calvin Andrew He, DO is a health care provider primarily located in Ontario, CA, with other offices in MONTCLAIR, CA and Rancho Cucamonga, CA(and 8 other locations). View Profile

Dr. Anthony Gan, MD

Critical Care Medicine
12 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Anthony Gan, MD is a health care provider primarily located in Ontario, CA, with other offices in Pomona, CA and Ontario, CA(and 2 other locations). View Profile

Dr. Bahman John Moghadam

Nephrology
11 years exp
Ontario, CA1.4 mi
Dr. Bahman John Moghadam is a health care provider primarily located in Ontario, CA, with other offices in San Dimas, CA and Pomona, CA(and 9 other locations). View Profile

Dr. Vince Wook Ha, MD

Nephrology
24 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Vince Wook Ha, MD is a health care provider primarily located in Ontario, CA, with other offices in Corona, CA and Riverside, CA(and 10 other locations). View Profile

Dr. Alexander George Kassar

Critical Care Medicine
13 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Alexander George Kassar is a health care provider primarily located in Ontario, CA, with other offices in West Covina, CA and San Dimas, CA(and 11 other locations). View Profile

Dr. Ye Min Oo

Infectious Disease
15 years exp
Ontario, CA1.4 mi
Dr. Ye Min Oo is a health care provider primarily located in Ontario, CA, with other offices in Pomona, CA and Ontario, CA(and 2 other locations). He has 15 years of experience. View Profile

Dr. Aftab Altaf Qadir, MD

Pulmonology
10 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Aftab Altaf Qadir, MD is a health care provider primarily located in Ontario, CA, with other offices in Colton, CA and Ontario, CA(and 2 other locations). View Profile

Dr. Saman Sarani, MD

Nephrology
16 years exp
Accepting New Patients
Ontario, CA1.4 mi
Dr. Saman Sarani, MD is a health care provider primarily located in Ontario, CA, with other offices in ONTARIO, CA and Upland, CA(and 9 other locations). View Profile

Dr. Raed El-Hajjaoui, MD

Internal Medicine
12 years exp
Ontario, CA1.4 mi
Dr. Raed El-Hajjaoui, MD is a health care provider primarily located in Ontario, CA, with other offices in Colton, CA and Riverside, CA(and 7 other locations). View Profile

Dr. Hassan Ali Chahine, MD

Hospital Medicine
11 years exp
Ontario, CA1.4 mi
Dr. Hassan Ali Chahine, MD is a health care provider primarily located in Ontario, CA, with other offices in West Covina, CA and Rancho Cucamonga, CA(and 5 other locations). View Profile

Dr. Aileen Kit Ying Lo, MD

Public Health & General Preventive Medicine
16 years exp
Accepting New Patients
Ontario, CA1.5 mi
Dr. Aileen Kit Ying Lo, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. She has 16 years of experience. View Profile

Dr. Salvador Basbas Villalon, MD

Internal Medicine
40 years exp
Accepting New Patients
Ontario, CA1.5 mi
Dr. Salvador Basbas Villalon, MD is a health care provider primarily located in Ontario, CA, with other offices in Victorville, CA and Victorville, CA(and 3 other locations). View Profile

Dr. Gilbert Yannick Cheung, MD

Neuroradiology
23 years exp
Ontario, CA1.7 mi
Dr. Gilbert Yannick Cheung, MD 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. Charles Ihong Lu, MD

Nephrology
31 years exp
Ontario, CA1.7 mi
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. Jan Michael Herrman, MD

Nephrology
46 years exp
Ontario, CA1.7 mi
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. Frederick Man Lai, MD

Hospital Medicine
19 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Frederick Man Lai, MD is a health care provider primarily located in Ontario, CA, with other offices in Orange, CA and Ontario, CA. He has 19 years of experience. View Profile

Dr. Joshua George Milius, MD

Anesthesiology
20 years exp
Ontario, CA1.7 mi
Dr. Joshua George Milius, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 20 years of experience. View Profile

Dr. Douglas Dung Do, MD

Hospital Medicine
19 years exp
Ontario, CA1.7 mi
Dr. Douglas Dung Do, MD is a health care provider primarily located in Ontario, CA, with other offices in Fontana, CA and Ontario, CA. He has 19 years of experience. View Profile

Dr. Edward Orville Blews, MD

Pediatrics
19 years exp
Ontario, CA1.7 mi
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. Gregory Thomas Havlena, MD

Vascular & Interventional Radiology
17 years exp
Ontario, CA1.7 mi
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. Su S Hline, MD

Nephrology
39 years exp
Accepting New Patients
Ontario, CA1.7 mi
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. David J Hall, DO

Internal Medicine
Ontario, CA1.7 mi
Dr. David J Hall, DO is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. His specialties include Internal Medicine. View Profile

Dr. Michael Yaotsung Chan, MD

Gastroenterology
20 years exp
Ontario, CA1.7 mi
Dr. Michael Yaotsung Chan, MD is a health care provider primarily located in Ontario, CA, with other offices in Fontana, CA and Ontario, CA. He has 20 years of experience. View Profile

Dr. Linh Ngoc Truong, MD

Internal Medicine
16 years exp
Ontario, CA1.7 mi
Dr. Linh Ngoc Truong, MD is a health care provider primarily located in Ontario, CA. She has 16 years of experience. View Profile

Dr. Annie Park, MD

Oncology
11 years exp
Ontario, CA1.7 mi
Dr. Annie Park, MD is a health care provider primarily located in Ontario, CA, with another office in LOMA LINDA, CA. She has 11 years of experience. View Profile

Dr. Kishan Moolraj Thapar, MD

Internal Medicine
48 years exp
Ontario, CA1.7 mi
Dr. Kishan Moolraj Thapar, MD is a health care provider primarily located in Ontario, CA. He has 48 years of experience. His specialties include Internal Medicine. View Profile

Dr. Jessica Ekomerei Obi

Internal Medicine
6 years exp
Ontario, CA1.7 mi
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. Esther Yeajin Kwon, MD

Geriatric Medicine
13 years exp
Ontario, CA1.7 mi
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. Paul Lim, MD

Internal Medicine
35 years exp
Ontario, CA1.7 mi
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. Jonathan Ilyong Lo, MD

Internal Medicine
29 years exp
Ontario, CA1.7 mi
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. Ahmad Salman Adam

Internal Medicine
7 years exp
Ontario, CA1.7 mi
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. Matthew Charles Edwards

Internal Medicine
6 years exp
Ontario, CA1.7 mi
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. Dat Man Ha, DO

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

Dr. Mihee Park, MD

Oncology
11 years exp
Ontario, CA1.7 mi
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

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.

Ensuring Data Transparency and Trust: A Guide to Vitals Doctor Listings and Reviews

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.