Patient Reviews
GI Alliance physicians are among the most reputable and distinguished gastroenterologists across the nation. Focused on clinical excellence and patient-centered care, our specialists seek to be the partner you need in your quest for better health. We value patient feedback and appreciate every review we receive from those we are privileged to treat. For your convenience, we have gathered a collection of reviews, stories, and testimonials provided by patients who have visited our practices. We welcome you to explore the feedback below to learn more about what it means to be a patient of GI Alliance.
"Dr. Mark Miller and his staff is a first class medical team. This was my first time having a colonoscopy. Dr. Miller was able to calm my fears. He met with me before the procedure and told me what to expect. My job was to take the solution, show up on time, sleep, wake up and get your results. No healing is needed. This is PM (Preventive Maintenance) for your body! Don't be someone that schedule oil changes for their car and won't make sure all is well inside your body. When it's time for you to get this procedure, do it! It's nothing like knowing what is going on inside of you. I highly... recommend Dr. Mark Miller."
"Dr. Miller is a warm, caring and fantastic doctor. He answers all questions thoroughly and spends time with you to explain your problems. I have seen him for many years."
"Love Dr. Miller! He is so attentive to the care of his patients. Due to results of labs, they moved my appointment up 2 months. He called on a Sunday to give the results of a procedure and next steps."
"Dr. Miller is awesome. He was quick to come into the room to see me. Talked to me directly, not on the laptop. Knew my history, he addressed my concerns and offered options with rationale! He is very personable and always makes me feel comfortable to talk to him."
"Dr. Miller and his staff were very professional and informative."
"Absolutely thrilled to have Dr Mark Miller as my medical Gastro Intestinal Dr.! As a supporter of the Specific Carbohydrate Diet he understands the SCD value of the correct foods nutritionally for gut healing. Im grateful to have him on my team in this healing journey."
"My wife saw Dr. Miller and we were impressed by his professionalism and the high standards exhibited by his staff. Ann Parker, RN,and Bernard Parker, MD."
"Dr. Miller is great and everyone was very professional."
"Dr. Miller and the medical staff that helped me on the day of my procedure were kind and friendly. They made me feel comfortable by explaining every detail that was going to happen that day. Thank you for making me feel less nervous that day."
"Dr. Miller had been my GI guy for several years. I would highly recommend him to family and friends."
"I love Dr. Miller and his crew. Everyone was so nice and helpful. Will definitely recommend him."
"This office in Garland is okay but I much rather prefer the one in Rockwall my experience was awesome Dr Miller is one of a kind he is very experienced in his field of work I wouldn't trade him for anything"
"Go figure, a doctor that wants to listen to you. I can not explain how wonderful it was to have a provider listen intently to my input. Dr. Miller addressed each of my concerns and helped me understand the full scope of what my treatment would look like. Excellent physician."
"I am glad to be a patient of Dr. Miller who is very down to earth person, and a caring physician."
"Amazing staff and support. Everyone was great before and after the procedure."
"Very professional. Everyone was so good. From the front door, through prep and recovery."
"Everyone I cane in contact with was absolutely awesome! Dr. Miller is the best. He doesn't rush through the interview and tells you everything he will be doing, how long it will take and everyone that will be assisting him."
"Bri just called from Dr. Miller’s office with my colonoscopy biopsy results. 👏👏 She was very professional, personable, and helpful in explaining everything and, as I suspect, Dr. Miller already knows that Bri’s a keeper."
"Dr. Miller is a great Doctor and surrounds himself with quality people. Cant say enough about the level of care from this office and the people who work for Dr. Miller. Top notch!"
"I've been using Doctor Miller for 10 years now. He has great bedside manner and his staff is extremely nice. They were very accommodating on my last appointment. I would recommend Dr Miller."
"Dr Miller has been our doctor for almost 30 years! He is THE best. He is personable, yet professional."
"Dr Mark R. Miller is very experienced in colonoscopy area. His professional and experiences have made thing easy and helpful for patients. The colonoscopy process went very smoothly. This is the third time I see him in 15 years period. Thank you Dr. Miller"
"Dr Mark R. Miller is very experienced in colonoscopy area. His professional experience have made thing easy and helpful for patient. The process went very smoothly. This is the third time I see him in 15 years period. Thank you Dr. Miller"
"Dr. Miller is always professional explaining everything in detail , attentive to your needs and questions. A great personality and smile"
"Dr. Miller was extremely personable, caring, thorough and knowledgable, I am very pleased to become his patient."
"Everything went very well. The wait time was reasonable; and, the receptionist, nurse and doctor were all friendly and informative."
"Dr Miller was very nice. he spent alot of time answering my questions and discussing my issues. He was very comfortable to talk to. He was very thorough. I would highly recommend him"
"Dr. Miller is very intelligent and compassionate. He always takes time to listen, ans very thorough with his explanations of my issues and treatments. He is a wonderful physician, and have recommended friends and family to him many times."
"Dr. Mark Miller a compassionate and caring doctor who will take the time to listen and communicate with his patient. I appreciate the time Dr. Miller spent with me even with his busy schedule."
"Doctor Miller is one of the best doctors that I've ever used My husband and I have been going to him since 2008 Amazing staff and Brianne has been there ever since I could remember. Highly recommended office."
"Dr Miller and his PA are very professional. Have recommended him to those that need a GI Specialist"
"Doctor Miller is caring and passionate about his patients and their concerns. I highly recommend him!"
"I have had nothing but positive experiences here. Doctor Miller and staff are excellent and I cannot recommend this office enough!"
"Doctor Miller is the best"
"Great experience! Dr. Miller, was outstanding. His staff was great too! I highly recommend Dr. Miller!"
"It's a blessing to be the patient of Dr Mark Miller. He listens to his patients and he cares about them."
"After a referral from Wylie ER for Dr Miller, the appointment went very well. Dr Miller is very knowledgeable and easy to talk to. I really appreciate all the staff at his facility they too were very kind and professional. I am pleased with the results."
"I have been a patient of Dr Mark Miller for many years and I'm always so grateful for all he has done for me. He is very professional and caring, he takes time to listen, give advice, to explain and to answer my questions."
"One of the best all around doctors!!"
"Been seeing Dr Miller for 23 years. Outstanding GI doctor"
"Professional, timely, extremely helpful in explanations, etc etc :) :)"
"One of the best doctors around!! So caring and truly taking care you and helps you understand your health and potential issues! I can’t recommend him enough to everybody. Thank you Dr Miller for your care!"
"Dr Miller has been taking care of me.for 20 years. Enough said except I love him and his staff."
"Love Dr. Miller! He’s knowledgeable and kind and he or his staff always gets back to you to answer your questions. Definitely recommend."
"Dr Miller and staff are very nice and professional. Dr Miller is very easy to talk to and explained everything in detail. Great visit!!!"
"This doctor is wonderful, very knowledgeable, thorough and down to earth with completely easy to understand explanations. If you're having problems, in the end then this is you're go to guy!!!!@"
"Hands down, one of the nicest doctors I’ve ever met. Very personable and friendly. He gave a thorough explanation of what would happen during the colonoscopy. His office uses a different company to find the prep meds in order to get you the best price. This worked great for me bc my insurance company refused to pay, but I only ended up paying $60 when it would have been almost $300. Recommend."
"I don’t like going to see doctors! Dr. Mark Miller puts me at ease right away. He came into my exam room fully knowledgeable about my health history, like I am his only patient. It is 2023 and he brought up a procedure I had with another doctor in 1998. He seems very knowledgeable about Crohn’s Disease and other digestive disorders. I highly recommend him as a gastroenterologist!"
"Excellent dr. Explains to your understanding ‼"
"Awesome doctor"
"Dr. Miller and staff were all very nice and professional office was clean. I would recommend his services."
"Great doctor 👏."
"Dr. Mark Miller is the best. Highly recommend, been to him several times. He’s so considerate and sensitive to your needs. Always go above and beyond to make sure your comfortable all while getting the job done in a timely manner."
"I have known Dr. Miller for over a decade. He is very nice, intelligent and cares about his patients. He doesn't over do but, he does what is needed to make an accurate diagnosis."
"I have been seeing Dr Miller for several years. He is very professional and knowledgeable in his specialty. He is very easy to talk to and communicates very well."
"I'm a registered nurse and a patient of Dr. Miller. He has the best bedside manner of any Doctor out there. He is extremely knowledgeable, kind, and funny. He will be my GI Dr. Until I'm an old man.."
"Dr Miller and his staff are the BEST! I have been seeing Dr Miller since the late 90’s. Very Professional!"
"Great doctor. One of the best."
"I have been a patient of Dr Miller for several years and will be for many more. He and his staff provide excellent care, on target diagnosis and always make time to explain all details. Wonderful doctor and team."
"I really like Dr. Miller because he is so personable. I’ve had multiple occasions when he has called me at home to check and see how I was doing. There at not a lot of doctors that do that anymore!"
"I love how Dr. Miller listens to all of your symptoms and concerns and go over everything with you, he explains with details and even with a picture! I highly recommend him."
"I’ve been going to Dr. Miller for 30 years. He’s the best! He’s extremely kind and very knowledgeable. I highly recommend!"
"Condolration with Dr. Mark Miller was informative and put me at ease for upcoming prcedure, I highly recommend Dr. Miller"
"Dr Miller and his staff always make me as comfortable as possible. They’re friendly, professional, and provide as much information as is needed to feel confident about the procedure. I’ve seen him for the last three colonoscopies and wouldn’t consider going to anyone else."
"Been with Dr Miller 25 years. He is an excellent GI physician. Highly recommend."
"I found Dr Miller very knowable and willing to listen to my concerns. I wo I would recommend him to anyone."
"Dr Miller is hands down the best GI doctor. I have switched doctors several times because I just wasn’t happy with their care but Dr Miller is it for me. I have Crohn’s as well as another rare disease that causes GI issues so I need a GI doc that can handle my issues and he is the one!"
"Very helpful and excellent office personnel."
"Been going to Dr. Miller for years. Very personable. Always have great conversations with him. Highly competent Dr. Highly recommend!"
"It's hard to describe when a physician is great at his job and a joy to see, but thus has been my experience for over 10 years with this fine gentleman and I encourage anyone with the need to not hesitate to choose this practice!!!!!"
"Great doctor and great nurse. Hard combo to find. Super responsive duo. Dr Miller has been treating my UC for 18 years. He allows you to have an active part in your treatment options. Wouldn’t see anyone else. Very caring."
"Perfect with all my needs. He found out so much for me. He was so thorough in finding so much that I feel he saved my life. Thank you Dr. Miller."
"I had a great experience visiting Dr Miller, he was very professional, attentive to m needs and concerns and not n a rush to get me n and out of his office"
"Dr Miller is awesome! Down to earth guy, takes his time explains everything so you can understand it. And a car guy what could be better? LoL"
"Dr. Miller is an awesome doctor! He has helped me out tremendously over the years. I initially went for a second opinion and am so glad I did. My health issues are minor compared to some others with the same condition. He always asks for my input and preference on treatment plans and leaves the aggressive factor up to me. He fully explains everything in detail and always makes sure that I fully understand everything that is going on. He is also very easy to speak with and has a great bedside manor. He has never made me feel belittled or dumb for asking questions. If you need a GI doc then he is the go to guy as far as I’m concerned!"
"I have been a patient of Dr. Miller for several years. He is very personable and easy to discuss whatever problems you might have. I would highly recommend him to anyone."
"I really appreciated dr. Mark Miller for all his time and patience and explaining things in detail I recommend him highly if you are looking for GI doctor you will not regret it"
"Dr Miller is personable and even better he doesn’t keep his patients waiting so long like most physicians do. He cares about the patients and the caregivers and their time too."
"Positive experience with being scheduled and seen by Dr. Miller. Would definitely recommend."
"Dr. Miller and staff are amazing. Extremely knowledgeable and talks to you as if you’re a personal friend!"
"I have known Dr Miller for many years. He is compassionate, listens carefully to your problems and gives proper care"
"Dr. Mark Miller is very professional. He has helped me tremendously and I'm very grateful!"
"What a down to earth physician. Very easy to talk to and Dr Miller made me feel like a family member. Definitely will use him in the future."
"Great man Dr Miller is very attentive and friendly. Very knowledgeable and he is my favorite!!!"
"Dr. Miller listens and takes time to explain in detail all my questions"
"Dr Miller is so caring. He cares about his patients health and will recommend ways to get there. He explains in detail."
"Dr. Mark Miller is phenomenal. Kind, compassionate, bed side manner that surpasses none! Office staff is superb."
"Dr. Miller has been treating members of our family for over 20 years. He is a wonderful doctor and person. Truly cares for his patients. Very kind while being very honest about any issues."
"Doctor Miller, his staff, and DHAT have been a large part of my life for the better part of 20 years now. They are my gold standard and so far no one has come close."
"I have known Dr Miller for over thirty years . He is my chosen one when it comes to my colonoscopy .. lol Always willing to answer all my questions . He is a very kind , caring, professional Doctor . I have referred many friends and family to him .."
"I have been a patient of Dr. Miller for 6 years and have always been happy with my treatment. Like any good group, they are busy. However, that has not impacted the quality of level of care I've received from Dr. Miller or his staff."
"I couldn’t ask for a more personable and caring doctor. They should all take notes from him!"
"The staff was amazing! Dr. Miller was very personable and genuinely cares about his patients! He took the time to explain the entire process/procedure from start to finish. I'm extremely glad that I chose Dr. Miller to do my procedure."
"Dr. Miller was great! He listened to what I had to say and worked with me on the next steps instead of just dictating what I needed to do next."
"Dr. Miller is one of my 2 most favorite doctors. Qualified/ caring/ professional/ personable. I recommend him to everyone whether they need hom or not!!!"
"I will never go anywhere else! Dr. Miller and his staff are the best! I always feel completely comfortable around them! ❤️👍"
"Dr Miller is very thorough and caring. Office staff and everyone were amazing! Can’t wait to see him in 10 years!!!"
"Dr. Miller has been my doctor for over 15 yrs and absolutely NO complaints He cured my HEP C!! 15 Years ago and still cleared and no need for 2 yr visits. Thank you doctor Miller!!"