Peak Gastroenterology Associates Who We Are

Peak Gastroenterology Associates is among Colorado’s fastest-growing enterology practices and offers state-of-the-art care in our modern Lone Tree clinic. Our highly skilled and empathetic staff is committed to ensuring your healthcare experience is comfortable, safe, and effective.

doctors at Peak Gastroenterology Associates
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Our Areas of Expertise Specialists in Gastroenterology

At Peak Gastro, you will have access to some of Colorado’s finest board-certified gastroenterology specialists in Lone Tree. Our team is devoted to delivering the highest level of compassionate care throughout each phase of your diagnosis and treatment. Our cutting-edge diagnostic technologies and therapeutic procedures ensure your journey to improved health is safe and successful.

View Conditions Treated
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Your Health is Our PriorityTime for Your Colonoscopy

Do not delay a colonoscopy. This essential screening is critical for early detection of colon cancer. Your comfort is our top priority at Peak Gastroenterology Associates in Lone Tree. Under the care of our dedicated medical team, you will receive attentive and compassionate care to help protect your health and well-being.

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Clinical Excellence and Superior Care An Accurate Diagnosis with EGD

Receive an EGD test at our Lone Tree office to diagnose upper gastrointestinal symptoms and conditions precisely. Our advanced EGD procedures deliver pinpoint diagnoses for conditions such as GERD and stomach ulcers. We thoroughly identify the root causes of your symptoms to develop a customized treatment plan, ensuring you receive the highest standard of care.

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Patient Testimonials

The best experience possible.

The staff at Peak Gastroenterology Associates were excellent; they were professional, caring, and sought to provide the best experience possible. Dr. Chun was extremely knowledg...

—Anonymous

A very pleasant and helpful place to go.

This was a very pleasant and helpful place to go. My doctor was so helpful in getting me what I needed really quickly. I do recommend this place to anyone having gastro issues.<...

—Anonymous

From the moment I walked in, I felt genuinely cared for and respected.

I recently had a follow-up appointment with Molly Lopez, and I couldn't be more satisfied with the experience. From the moment I walked in, I felt genuinely cared for and respec...

—M.G.

Feel we are a team working on the same goal.

My appointments have always been on time. I have never felt rushed and appreciate the thoroughness of the staff in getting all the information, asking questions, and answering a...

—Anonymous

They made me feel relaxed.

I was very nervous when I walked in,  but from the moment I walked to the front desk, they made me feel relaxed. The doctor was awesome and explained everything to me befor...

—Anonymous

One of the best gastroenterologists in town.

Dr. Patel is always thorough and explains everything. He is very knowledgeable and one of the best gastroenterologists in town.

—Anonymous

I have been a patient for 14 years.

I have been a patient for 14 years. It was my first time I seen Morgan Tevlin. I thought she was amazing! She read my medical record before entering the room. She even looked at...

—S.Z.

The staff is friendly & listens!

The staff is friendly & listens! Zara is very thorough, patient & reassuring. She ordered tests that will help with a diagnosis & they were ordered the same day. Gre...

—L.A.

All very kind and friendly.

My GI doctor really listened when I told her something was wrong. She always explained the plan of action. She always asked my opinion on what I wanted to do and was very unders...

—Anonymous

Doctors and staff are professional and friendly.

I have had several appointments over the past seven years and was always treated well. The doctors and staff are professional and friendly. Even my husband had high praise for t...

—Anonymous

They take the time to listen.

They take the time to listen and really care about my health. Ryan has made it a point to help me in every aspect, and it is greatly appreciated.

—Anonymous

They are so understanding.

They are so understanding about what you’re going through.

—Anonymous

Everyone was professional, friendly, and efficient…

Everyone was professional, friendly, and efficient and took the time to explain procedures, medications, and aftercare.

—Anonymous

I highly recommend them.

Very professional and friendly staff. I highly recommend them if you require this service.

—Anonymous

Great people!

Great care! Great people! Great service! Done in a timely manner!! Would go again!!

—Anonymous

Professional and caring.

All the staff was very friendly. Dr Lee took the time to answer all my questions. She is professional and caring.

—Anonymous

Very knowledgeable and accommodating.

Dr. Harmon and the staff are all very knowledgeable and accommodating to their patients. I highly recommend Peak Gastroenterology!

—Anonymous

Thank you for all you do!!!

My condition is already improving. Thank you for all you do!!!! I can’t remember the names of the anesthesiologist and nurse anesthetist, but they were both awesome and he...

—Anonymous

They go above and beyond to make you feel comfortable.

I had an amazing experience with everyone! Check-in is fast! The nursing staff and technicians are friendly and great at what they do. Their outpatient center for scopes, etc., ...

—Anonymous

I really was pleasantly surprised…

I have had nothing but great care at this facility. They have been amazingly helpful, listened to my concerns, and answered my questions without needing a “new appointment...

—Anonymous

Jamie Thompson is WONDERFUL.

Jamie Thompson is WONDERFUL.

she has taken care of me for quite sometime. She is caring and gives her highest regard to ME her patient! We have always had a great sense o...

—C.M.

She's the best there is!

Dr Cesario is so kind and caring!

She always listens to you! She never gives up on you no matter what.

She's the best there is!

—A.S.

I feel like they really actually care.

This clinic has always been great to me and very understanding. I feel like they really actually care.

—K.K.

Nurses were all very nice but I loved the doctor!

Nurses were all very nice but I loved the doctor! He was very personable, funny, but also to the point all while giving me bits of information to remind me what I need to do to ...

—J.K.

It was a pleasant experience with little wait time and very efficient staff.

This was my first time visiting their office. It was a pleasant experience with little wait time and very efficient staff. Provider Morgan was thorough helped eased my tension a...

—E.

I saw Terry Lynn Markham here and she was amazing!

I saw Terry Lynn Markham here and she was amazing! Very compassionate and understanding about my gastro issues. She asked questions about my health & my family history. She ...

—S.

Chelsea Nelson is knowledgeable, friendly and puts you at ease.

Chelsea Nelson is knowledgeable, friendly and puts you at ease. I wish I didnt have the issue that I see her for, but I enjoy talking to her at our appointments. She listens to ...

—D.M.

All reception staff were very polite.

All reception staff were very polite. Chelsie Nelson was wonderful explaining information and easy to talk with. The place is clean. The only issue, it was hot and uncomfortable...

—T.F.

Everyone I came in contact with at Peak Gastro was kind and helpful.

Everyone I came in contact with at Peak Gastro was kind and helpful. Molly Lopez was especially attentive to all I had to say and had good advice about what might help me.

<...

—A.R.

Chelse Nelson is also amazing.

Chelse Nelson is also amazing. Caring, compassionate and listen to my concerns no matter how long I take. She is patient and I have always been satisfied with her bedside manner...

—M.G.

I am treated like a friend.

I am treated like a friend. Jamie is amazing. No question went unanswered. Thank all of you for your kindness. Darla Neal

—D.N.

Chelsea is amazing.

Chelsea is amazing. She’s very attentive, always taking the time to listen to symptoms and answer questions. Thoroughly explains options and results of testing. Prompt in ...

—R.S.

Chelsea was very good at explaining everything so that my husband and I could understand it.

Chelsea was very good at explaining everything so that my husband and I could understand it. She took the time to go over very complex issues. I really appreciated her willingne...

—C.R.

Jamie Thompson was so kind and attentive!

Jamie Thompson was so kind and attentive! She listened to me and made me feel comfortable right off the bat! I'd definitely recommend going and seeing Jamie!

Update- Jami...

—A.C.

I found my visit with Jamie Thompson very satisfying!

I found my visit with Jamie Thompson very satisfying! Ms Thompson was professional, efficient and had a great sense of humour. I look forward to my follow-up visit after my labs...

—S.L.
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Clinical Excellence for Gastroenterology in Lone Tree Interventional Endoscopy

Discover personalized, advanced care through our Lone Tree-based Interventional Endoscopy Program. Our expert team uses the latest medical technology to treat and manage complex gastrointestinal conditions for optimal health outcomes and premier care.

Learn More About Interventional Endoscopy
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Advancing the Field of Gastroenterology Leading Innovation in Clinical Research & Trials in Lone Tree

Through comprehensive clinical research and trials, Peak Gastroenterology Associates stands at the forefront of gastroenterological innovations. Our commitment to advancing medical science provides access to the latest breakthroughs and state-of-the-art treatments in digestive healthcare.

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Explore Our
Expansive Video Library

At our Lone Tree location, we prioritize your comfort and thorough understanding of your treatment options. Explore our video library to gain insights into our procedures and services, helping you feel informed and at ease every step of the way.

Peak Gastroenterology Associates Providers Providers at this Location

Mary Ann Huang

Mary Ann Huang, MD

Ryan McWilliams

Ryan McWilliams, MD

Charlene Chun

Charlene Chun, MD

Thomas Welton

Thomas Welton, MD

Teal Mefford

Teal Mefford, NP-C

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