697 Internists Found in Ontario, CA – Page 4

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 181 to 240 of 697 Internists.

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Featured Results

Eric Harker

Internal Medicine
Spent time with me
25 years exp
Accepting New Patients
Virtual Visit available
Lyons, CO
"He now practices at Iora Primary Care in Arvada. Excellent." 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. 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

Trisha Khanna, MD, FAAD

Dermatology
Had a good bedside manner
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. Adama Diarra, DO

Internal Medicine
Provided follow-up after the visit
14 years exp
Accepting New Patients
Virtual Visit available
Tigard, OR
"Dr. Adama Diarra was my 84 year old father's PCP. Dr. Diarra was very pro-active in adjusting his medications as his disease sates progressed and his kidney function declined." View Profile

Bonni London, MS, RDN, LDN

Registered Dietitian
28 years exp
Accepting New Patients
Virtual Visit available
Sarasota, FL
ACCEPTING NEW PATIENTS FOR TELEHEALTH SERVICES in NY, CA, AZ, FL & COACCEPTING IN PERSON VISITS in Sarasota & Lakewood Ranch communities in FLORIDABonni London, RDN, is a registered dietitian nutritionist and founder of London Wellness, holding a Masters degree in Clinical Nutrition from NYU. 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. 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. Andy Chuu, MD

Nephrology
11 years exp
Ontario, CA1.7 mi
Dr. Andy Chuu, MD is a health care provider primarily located in Ontario, CA, with other offices in Saint Louis, MO and Creve Coeur, MO(and 6 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. 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. Danish Abbas, MD

Internal Medicine
13 years exp
Ontario, CA1.7 mi
Dr. Danish Abbas, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 13 years of experience. View Profile

Dr. Ryon Todd Maland

Internal Medicine
9 years exp
Ontario, CA1.7 mi
Dr. Ryon Todd Maland is a health care provider primarily located in Ontario, CA, with other offices in Baldwin Park, CA and Ontario, CA. He has 9 years of experience. View Profile

Dr. Anthony Rajakone Rajasingham

Internal Medicine
9 years exp
Ontario, CA1.7 mi
Dr. Anthony Rajakone Rajasingham is a health care provider primarily located in Ontario, CA, with other offices in Fontana, CA and Ontario, CA. He has 9 years of experience. View Profile

Dr. Mukti Tripathi

Internal Medicine
22 years exp
Ontario, CA1.7 mi
Dr. Mukti Tripathi is a health care provider primarily located in Ontario, CA, with other offices in Baldwin Park, CA and Ontario, CA. She has 22 years of experience. View Profile

Dr. Doh Joon Park

Internal Medicine
6 years exp
Ontario, CA1.7 mi
Dr. Doh Joon Park is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 6 years of experience. View Profile

Dr. Samuel Minkee Shin

Internal Medicine
15 years exp
Ontario, CA1.7 mi
Dr. Samuel Minkee Shin is a health care provider primarily located in Ontario, CA. He has 15 years of experience. His specialties include Internal Medicine, Radiation Oncology. 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. Athena Theresa Alexander, MD

Internal Medicine
13 years exp
Ontario, CA1.7 mi
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. Dien T Ton Ton-That, DO

Internal Medicine
17 years exp
Ontario, CA1.7 mi
Dr. Dien T Ton Ton-That, DO 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. Hugo Victor Hua, MD

Internal Medicine
10 years exp
Ontario, CA1.7 mi
Dr. Hugo Victor Hua, MD is a health care provider primarily located in Ontario, CA. He has 10 years of experience. His specialties include Internal Medicine, Pediatrics. View Profile

Dr. William Lai, MD

Internal Medicine
22 years exp
Ontario, CA1.7 mi
Dr. William Lai, MD is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 22 years of experience. View Profile

Dr. Paul Bao Han, MD

Internal Medicine
29 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Paul Bao Han, MD is a health care provider primarily located in Ontario, CA, with other offices in Baldwin Park, CA and Ontario, CA. He has 29 years of experience. View Profile

Dr. Sunil Ramnani, MD

Internal Medicine
36 years exp
Ontario, CA1.7 mi
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. Janet Cheryl Yang, MD

Gastroenterology
22 years exp
Accepting New Patients
Ontario, CA1.7 mi
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. Muhammad Tajbaz Khan, MD

Internal Medicine
26 years exp
Ontario, CA1.7 mi
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. 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. Ragu Sivarajan, MD

Internal Medicine
13 years exp
Ontario, CA1.7 mi
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. Michael Seung Oh, MD

Neurology
18 years exp
Ontario, CA1.7 mi
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. Alexander Kyungjin Han, MD

Gastroenterology
21 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Alexander Kyungjin Han, MD is a health care provider primarily located in Ontario, CA, with other offices in Ontario, CA and Ontario, CA. He has 21 years of experience. View Profile

Dr. David Chung Wei Wang, MD

Internal Medicine
12 years exp
Ontario, CA1.7 mi
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. Jeff Sean Chuang, MD

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

Dr. Vicki Trang Thu Tran, MD

Internal Medicine
17 years exp
Ontario, CA1.7 mi
Dr. Vicki Trang Thu Tran, MD is a health care provider primarily located in Ontario, CA, with another office in Fontana, CA. She has 17 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. 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. 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. Edmond C Hui, MD

Internal Medicine
36 years exp
Accepting New Patients
Ontario, CA1.7 mi
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. Amin Motaref

Nephrology
23 years exp
Accepting New Patients
Ontario, CA1.7 mi
Dr. Amin Motaref is a health care provider primarily located in Ontario, CA, with other offices in CHICAGO, IL and San Dimas, CA(and 10 other locations). View Profile

Dr. Jessica Keeyoung Hong

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

Dr. Ahmereen Azim Khan, MD

Internal Medicine
26 years exp
Ontario, CA1.7 mi
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. Darpan Vanod Patel, DO

Internal Medicine
14 years exp
Ontario, CA1.7 mi
Dr. Darpan Vanod Patel, DO is a health care provider primarily located in Ontario, CA, with another office in Ontario, CA. He has 14 years of experience. View Profile

Dr. Isil Uzun Smith

Internal Medicine
15 years exp
Accepting New Patients
Ontario, CA1.7 mi
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. Wei Lin Chen, DO

Internal Medicine
18 years exp
Accepting New Patients
Ontario, CA1.7 mi
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. Alison Shin-Hwa Taur, MD

Nuclear Medicine
35 years exp
Ontario, CA1.8 mi
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. 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. 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. 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. 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, MD

Internal Medicine
50 years exp
Ontario, CA2.9 mi
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. 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. 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. 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. 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. 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. Rishu Marwaha, MD

Internal Medicine
25 years exp
Upland, CA3.4 mi
Dr. Rishu Marwaha, MD is a health care provider primarily located in Upland, CA, with other offices in Upland, CA and Fontana, CA. She has 25 years of experience. View Profile

Dr. Sandra Siewpin Lee, MD

Dermatology
28 years exp
Accepting New Patients
Upland, CA3.4 mi
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. 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. 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. Karin Chen Li, MD

Internal Medicine
22 years exp
Chino, CA3.9 mi
"Dr. Li has been a savior for me and my family. I have finally found a doctor that not only listens but takes steps to accomplish my health goals." 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

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.