3 Best Endocrinologists in Ontario, CA

Dr. Tony Kastoon, MD is a wonderful doctor. He takes his time, listens regarding medical problems and takes into account what you feel is working for your body as well. I moved out of the area but still make appointments to drive all the way to see him. I have run out of medicine and his staff has helped me to get an approval to refill. I highly recommend Dr Kastoon!!

Dr. Tony is one of the best Dr’s i have been with. He cares so much for his patients, and he gives enough time during the visits to answer all questions, and concerns. He looks what’s the best for your health. He is easy to reach. I even had emergency on one of the weekends and i was out of my insulin, and he called the pharmacy himself and the medication was ready right away. He treats his patients nicely, and with respect. I am with Dr. Tony since 2014 and despite my insurance moved me to another Dr. at some period of time, I requested to be back to him because i didn’t find as good as him the way he cares for his patients. I recommend him to all patients.

Dr Kastoon is an amazing doctor and a kind and caring individual. I have been so thankful for him over the past several years. He goes above and beyond to help my type 1 diabetic son. He genuinely cares about his patients. I choose my health insurance based on whether or not my son can be seen by him. He is the best. I also really appreciate Aliyah (office manager) who is helpful and knowledgeable.

I highly recommend Dr Tony Kastoon! He worked with me in getting my diabetes under control and closely monitors my thyroid. At one point during my course of treatment he performed a biopsy of my thyroid that was painless. He listens to my concerns and works with me in a team effort to educate and assisting me to be as healthy as possible. I do not ever feel rushed during my appointment. If you need an endocrinologist I highly endorse Dr Kastoon - KM Reply

This Dr is extremely talented and passionate he helped me feel comfortable and confident after other doctors told me very different stories. I highly recommend Dr mutaz for your health care.

Very happy with this facility a nd doctor. He was very informative, answered all my questions and felt was very concerned about my well-being. He made adjustments to my meds and im feeling more and more like myself.

I’m a doctor and I took my dad to see him a month ago. He changed his diabetes medications and now my dad was able to get off insulin. I would trust him on my family, and would recommend him highly. Staff were very organized and excellent. Thank you for your care.