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Thomas B. Nealis, MD

4.9

982 ratings Read Reviews

Northwestern Medical Group

Primary Specialty

Gastroenterology

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Practice Focus Areas

This medical professional has a particular interest or expertise in:

Education

Medical Education:: MD, Georgetown University School of Medicine - 2006
Residency:: McGaw Medical Center of Northwestern University - 2009
Fellowships:: McGaw Medical Center of Northwestern University - 2012

Board Certifications

American Board of Internal Medicine/Gastroenterology - Gastroenterology (Certified)

Faculty Profile

Assistant Professor, Feinberg School of Medicine

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Practice Groups and Affiliations

Medical Group:: Northwestern Medical Group
Alignment Category:: Northwestern Medicine Physician Network
On Medical Staff At:: Central DuPage Hospital

Delnor Hospital

Northwestern Memorial Hospital

Ratings and Reviews

At Northwestern Medicine, our patient’s feedback is important to us. While different care providers have their own unique strengths, we strive to be as transparent as possible with our quality of care.

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Overall Rating

4.9

4.9

982 Ratings

Reviews from Patients

100 Most Recent Reviews

Reviews from Patients

100 Most Recent Reviews

February 26, 2026

5.0

Very personable, have had 2 procedures now and everything has gone incredibly smoothly.

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February 26, 2026

5.0

Dr Nealis is amazing!! Very thorough in reviewing past records and a proactive approach!! Very very happy!!

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February 23, 2026

5.0

He explained everything clearly prior and communicated with me and my wife afterwards.

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February 20, 2026

5.0

Got results back with recommendations quickly.

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February 14, 2026

5.0

Kind professional thorough

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February 13, 2026

5.0

Very thorough and took time to explain everything to me.

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February 12, 2026

5.0

Very thorough, stays on top of things

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February 12, 2026

5.0

Very professional and transparent with explanation of GI procedure.

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February 12, 2026

5.0

Dr. Nealis was very thorough in discussing my situation and ordered all relevant tests.

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February 11, 2026

5.0

Very thorough, competent and caring.

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February 09, 2026

5.0

He is the best. Always patient first.

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February 09, 2026

5.0

Provided excellent care. Efficient. Good communication.

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February 09, 2026

5.0

if he wasn't late he would have gotten a 10

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February 08, 2026

5.0

He was very professional and explained everything to me

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February 05, 2026

5.0

Very thorough in understanding symptoms before recommending next steps for treatment

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January 29, 2026

5.0

My procedure was administered without complications and the team treated me kindly.

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January 29, 2026

5.0

The most thorough doctor I've ever had.

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January 29, 2026

5.0

Caring comprehensive. And explained treatment needed

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January 27, 2026

5.0

He's very polite he listens. He helps figure out the situation and eases my mind and communicates with you on the matter that you want to see him for . I'm very happy to call him my Gastrologist.

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January 26, 2026

5.0

Thought he and his staff did the procedure in a very professional manner. Report was sent out quickly.

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January 23, 2026

5.0

Dr. Nealis took time to talk to me prior to the procedure and explained how the EDG and Colonoscopy would proceed.

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January 22, 2026

5.0

Everyone was Professional,Polite & Sufficient

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January 20, 2026

5.0

Again, he's very knowledgeable and kind

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January 19, 2026

5.0

Very lucky to have such a great doctor. Great bedside, listens, pleasant.

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January 19, 2026

5.0

Pleasant and detailed

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January 19, 2026

5.0

Introduce himself, explain pas results and the procedure that begin done now. Thank Him For Me.

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January 19, 2026

5.0

Great doctor very knowledgeable, and he achieved positive results. Also his nurse was extremely helpful with my appointment scheduling and preparation. Thank you!

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January 16, 2026

5.0

He listens, follows through. Great care.

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January 02, 2026

5.0

I've been his patient for several years. He's so nice and explains everything to me.

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December 29, 2025

5.0

Listened to my concerns and gave me thorough advice

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December 29, 2025

5.0

Genuine and informative.

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December 29, 2025

5.0

I really like him and he explained everything he was going to do clearly.

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December 19, 2025

5.0

He is very professional and made you feel comfortable. He explained all of the process.

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December 09, 2025

5.0

Dr. Nealis is personable. I appreciated how he simply stayed on gathering the information he needed to determine how to proceed. He is direct, forthright, and conveyed a sense of experience and no nonsense approach.

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December 08, 2025

5.0

Successful procedures; Good communicator; Great bedside manner; the whole staff was very accommodating and reassuring

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December 04, 2025

5.0

His experience and professionalism got the job done well, and he followed up with clear, concise explanation of what went on and what is needed going forward. Plenty of notes in the chart. I liked this doctor and will ask for him again next year when I must have another same procedure.

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December 02, 2025

5.0

Very satisfied with the whole care

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December 02, 2025

5.0

Spent time to review my previous colonoscopies, and endoscopes and took family history. Very thorough!!

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December 01, 2025

5.0

Easy to deal with

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December 01, 2025

5.0

Dr. Nealis has been clear, direct and compassionate during this difficult time. He has also been very quick to respond and communicate which is much appreciated!

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November 30, 2025

5.0

Responsive and good

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November 28, 2025

5.0

Dr. Nealis is simply the best. He's very professional and kind!

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November 25, 2025

5.0

He's a good doctor and knowledgeable

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November 24, 2025

5.0

Good Dr who followed up with results.

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November 24, 2025

5.0

Dr. Nealis was very professional and cautious with my treatment without making me feel panicked.

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November 21, 2025

5.0

Very friendly, attentive and professional

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November 21, 2025

5.0

He's very good and followed through on everything he told he would do in regards to sharing information with family.

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November 20, 2025

5.0

Dr Nealis is an excellent physician.

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November 18, 2025

5.0

He is very competent.

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November 17, 2025

5.0

Answered my questions before the procedure, responded quickly to a follow up question. Was experienced and I felt fine after the procedure.

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November 17, 2025

5.0

He talk with me let me know what will go on very caring

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November 13, 2025

5.0

Good

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November 10, 2025

5.0

De. Nealis is caring, thorough and responsive to my needs.

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November 10, 2025

5.0

He explained the procedure and kept my family informed when it was completed, Good bedside manner.There were no issues.

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November 07, 2025

5.0

Dr. Nealis explained the procedure in detail and provided me with the results in the recovery room. Results were available in my chart 48 hours after procedure.

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November 04, 2025

5.0

He's an amazing Doctor with a level of kindness unmatched!

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November 04, 2025

5.0

Wonderful, personable, intelligent. Very highly recommend

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November 04, 2025

5.0

Dr. Nealis takes his time, listens well and asks questions in a manner that puts you at ease. He explains his plan of care thoroughly and meticulously. I am so fortunate to be one of his patients. Thank you Dr Thomas B. Nealis, MD.

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November 02, 2025

5.0

I personally respect it and liked him. And that's saying a lot from what I've been through.

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November 01, 2025

5.0

I was told once by a nurse he was the gold standard and he is. I have already sent him a patient and she was beyond happy with him.

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October 30, 2025

5.0

Excellent MD

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October 27, 2025

5.0

Dr. Nealis came to my rescue while I was in the Emergency Dept before successfully completing three procedures.

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October 23, 2025

5.0

Just an unbelievable bed side manner. He takes time to answer all your questions and throughly explains the process.

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October 07, 2025

5.0

Dr. Nealis introduced himself and walked me through the process. He explained what he would be looking for based on my history.

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October 04, 2025

5.0

Friendly- walked my cart into the procedure room.

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October 02, 2025

5.0

Brillant doctor with great bedside manner. I totally trust him!

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October 02, 2025

5.0

Nice personality explained what was going to happen

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September 30, 2025

5.0

My doctor/doctors explain everything very well and they gave me my results the following day which I was so excited about!

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September 30, 2025

5.0

Concerned about the patience health.

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September 29, 2025

5.0

Dr. Is good

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September 29, 2025

5.0

Excellent detail and information when I got my results. So helpful.

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September 28, 2025

5.0

very professional. very kind. very prompt. comforting bedside manner.

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September 23, 2025

5.0

A+ doctor

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September 20, 2025

5.0

It was the first time meeting him and he just seemed to have a very calm, bedside manner.

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September 19, 2025

5.0

Efficiency, people skill

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September 15, 2025

5.0

Clear communication, thorough exam

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September 13, 2025

5.0

Dr. Nealis was straightforward and clear when talking about the procedure.

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September 09, 2025

5.0

I love the way Dr explains everything to me.. a concern Dr is what I really needed

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September 08, 2025

5.0

Oh, my goodness, Dr. Nealis is an Angel in a medical field if I am allow to say that .

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September 07, 2025

5.0

He explains things clearly. He is professional and friendly.

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September 05, 2025

5.0

Dr. Nealis is extremely thorough and tending to patient needs in a comprehensive manner.

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September 04, 2025

5.0

Friendly, respectful and thorough

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September 01, 2025

5.0

He explained the procedure and made sure I understood the the objective

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September 01, 2025

5.0

Very thorough, listens extremely well, answers/explains all my questions

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September 01, 2025

5.0

Felt well cared for.

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August 22, 2025

5.0

Professional and kind.

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August 21, 2025

5.0

He is terrific

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August 19, 2025

5.0

He explained procedure and followed up with results in timely manner

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August 19, 2025

5.0

Communicates well Relaxed

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August 05, 2025

5.0

He answered all my questions and kept me informed of the process and results.

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August 04, 2025

5.0

Dr. Nealis was very professional but approachable. A very calming demeanor.

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August 02, 2025

5.0

Very friendly and efficient.

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July 24, 2025

5.0

Good technique with scoping and getting the polyps out

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July 22, 2025

5.0

Felt he was an excellent doctor. Kept me informed and did not scare me.

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July 21, 2025

5.0

Very competent. Answers all questions thoroughly.

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July 19, 2025

5.0

Professional, efficient, and answered my questions. Post procedure notes were detailed and informative

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July 19, 2025

5.0

Dr. Nealis is very friendly, polite and caring.

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July 16, 2025

5.0

Good Doctor

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July 15, 2025

5.0

He's very knowledgeable and thorough. Also very compassionate.

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July 15, 2025

5.0

Great communication and attitude

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Disclosures

Thomas B. Nealis, MD reported no external professional relationships for calendar year 2024.

External Professional Relationships

Pharmaceutical, device, and biotechnology companies frequently collaborate with basic scientists and physicians within an academic medical center to help advance science and improve patient care. These relationships are important in achieving scientific breakthroughs and in establishing the effectiveness and safety of promising new therapies. In order to assure objectivity in clinical research and patient care, the Northwestern University Feinberg School of Medicine (Feinberg), Northwestern Memorial HealthCare, Children's Hospital of Chicago Medical Center, and the Shirley Ryan AbilityLab have adopted integrity policies that require research and clinical faculty (in full-time, part-time, and unpaid/voluntary categories) to report compensated and uncompensated external industry relationships. Patients are encouraged to discuss these disclosures with their physician as well as to inquire as to how these relationships are overseen by Feinberg. To learn more about our Disclosure and Professional Integrity Policy, and the conflict of interest policies of our joint affiliate survey partners, please go to our Office for Regulatory Affairs Policies page.

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