“Courteous and professional”

I was taken care of in Dr. Rivadeneira's office in Smithtown. My PCP recommended me Dr. Rivadeneira, and I was very glad that I decided to visit his office. Dr. Rivadeneira is extremely professional, clear with his words and decisions, kind and courteous. I would recommend anyone who needs this type of medical help, to come to Dr. Rivadeneira for a consultation or treatment.

“Outstanding Doctor”

I can't say enough about my positive experience with Dr. R, the Northwell Health Network and my surgeries and stay at Huntington Hospital.
I mysteriously (I didn't rip during child birth, do not have gastric disease such as Crohn's) developed a rectovaginal fistula at the rarest possible spot at sphincter muscle. Doctor's near me, upstate NY, wouldn't even touch me. Dr. R first inserted seton drain to strengthen tissue and then performed fix months later. I am success story. I got my life back!

“My experience”

My experience with Doctor Rivadeneira and his medical staff was exceptional
I went to him about a blockage in my colon after completing two colonoscopy’s . He spent the time explaining to me my condition. He even provided me with a drawing showing exactly what his proposal was to correct my situation. His ability to explain and lead in layman’s terms was outstanding. He has a great bedside manner. The doctor and his staff supported me throughout my surgeries. Thank you Dr Rivadeneira

“I want to thank you for saving me. I was experiencing extreme intestinal problems. For several years I was told I had severe Diverticulosis.”

In the past months the pain became unbearable to the point I didn't want to eat to avoid additional pain.
My PCP recommended me to your office. Your review and explanation of my conditions was detailed and explained in a way I could understand and relate to. You explained what I surgical procedure I would require and that I would not require a bag. I am now 2months later with no eating restrictions, no bag , I go to the bathroom without pain or pressure. and most of all able to eat and Thxs

“Can't believe I waited that long”

From the very first visit Dr Rivadeneira was very patient and explained everything so any Layman could understand, The procedure went exactly as he explained and was so quick I didn't realize it was done, I waited 6 years to call his office to have this procedure done, and I can't believe how having the Rubber-band treatment for hemorrhoids has improved my life. His staff was also very helpful and patient.

“UNMATCHED BEDSIDE MANNER”

I recently had several visits with Dr. Rivadeneira due to hemorrhoids. Obviously this is an extremely sensitive area and very painful-- however, Dr. Rivadeneira's delicate care made me feel at ease at these appointments. He had to do a treatment called "banding" and as invasive as this is he made it far less painful than it could have been. He is very kind, professional and caring. His staff is top notch as well. I was always greeted with kindness and happy faces. He is truly amazing at what he

“Amazing Surgeon”

During a routine colonoscopy a cancerous tumor was found by my gastro(Dr. Keschner) who immediately called Dr. Rivadeneira. We were given an appointment 10am the following morning and surgery was scheduled for the end of the week. Dr. Rivadeneira took his time with us and explained everything that was going on and what options I had. I am now 6 months post op and I have very little change in my quality of life and I attribute that to Dr. Rivadeneira and his team.

“10/10 Amazing Surgeon”

I was recommended to see Dr. Rivadeneira for a fistula that was related to my Crohn’s disease. He was so personable, calm, and confident in his skills. He advised me to schedule surgery for a fistulotomy, and at first I was very anxious but eventually I went through with it, and I am so glad that I did. He was extremely reassuring the day of the surgery, and helpful with all of my questions and concerns. His operating team was fantastic. I highly recommend him to anyone!!

“Excellent doctor and very professional.”

I have visited Dr. Rivadeneria a few times and he even performed a surgery on me. The surgery was a success and I had a full recovery. Each time I have visited Dr. Rivadeneira, I was greeted with a warm welcome and had any questions answered before examination. He has a calming demeanor and great bedside manner, this put me at ease for having rather embarrassing problems solved. I would highly recommend this Dr.

“A Positive Experience from a Frightening Diagnosis”

After a frightening diagnosis of Colon Cancer, I was blessed by being referred to Dr. David Rivadeneira and his awesome team. What can I say? I am a 79 year old woman, not knowing what to expect, and the minute I met Dr. D, I knew all would be well. Everything was explained in detail, and a doctor who was patient and kind, as were all his wonderful team and front office staff. From my family and I, I thank you from the bottom of my heart.

“Dr. Rivadeneira”

Dr. R walked me through the worst medical experience of my life. He was kind, caring and listened to my concerns. I called him a few times with emergency situation and was called back within minutes.

“His mission is saving lives”

I first met Dr. Rivadeneira when I was diagnosed with colorectal cancer. It was a very frightening time for me. But, from our first meeting he calmed my fears with his kind and understanding manner. He listened and answered all my questions. I was not his patient. I was his family. He is a learned doctor/surgeon. His impressive C.V. is an understatement. I believe Dr. Rivadeneira's mission is saving lives. He saved both my life and my quality of life.

“My Favorite Surgeon”

This doctor not only diagnosed me in seconds he put me at ease immediately and completed the surgery I needed. Then he referred me to an excellent oncologist who would continue treatment
All through the process I feel like I’m in most excellent hands

“Dr Rivadeneira is very caring, professional and kind.”

Dr Rivadeneira was very patient and explained everything when I visited his office the first time. The procedure went exactly as he explained to me. He was kind, caring, professional, and listened to my concerns. The surge process is very quick and smooth and I am very happy now after the surgery. I will recommend him to anyone having the similar health problem.

“Dr Rivadeneira is the BEST!”

Dr Rivadeneira is the best hands down! He performed a flawless colon resection to remove a diseased part of my colon due to Diverticulitis. I have been 100% since April 2022. Highly recommend Dr R. Great bedside manner and follow up care. Honest and transparent.

“Diverticulitis Surgery”

After 3 months of wearing a drain for an abscess from Diverticulitis, I was recommended to Dr. Rivadeneira from another surgeon, due to the fact I was considered high risk. Met with Dr. Rivadeneira who explained in detail the surgery I need. He also advised me based on the CT scan, I may need a colostomy bag whether it be for 3 month or the rest of my life since the diverticulosis was spread throughout my sigmoid colon. My surgery lasted about 3 hours and Dr, Rivadeneira skills ensured that I di

“Great doctor”

He’s the best doctor I ever had.