Sameer M Mazhar, MD

Specialty: Gastroenterology

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2040 Ogden Avenue

Suite 401

Aurora, IL 60504

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Office: 630-585-7100

Fax: 630-692-4057

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Primary location

1221 North Highland Avenue

Aurora, IL 60506

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Office: 630-859-8700

Fax: 630-264-8828

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Meet Sameer M Mazhar, MD

About me

  • Gender:
  • Clinical interests: Autoimmune Liver ConditionsColorectal Cancer PreventionColo-Rectal ScreeningIrritable Bowel SyndromePeptic UlcersViral Hepatitis
  • Related website:



  • Undergraduate Degree: Northwestern University
  • Fellowship: Massachusetts General Hospital
  • Fellowship: University Of California
  • Residency: Northwestern University
  • Internship: Northwestern University McGraw Medical Center
  • Medical School: Feinberg School of Medicine, Northwestern Memorial Hospital

Board certifications

  • Gastroenterology

Hospital affiliations

  • Advocate Christ Medical Center
  • Advocate Dreyer

Insurance accepted

  • AAH Preferred – Team Member Plan
  • AAH Select – Team Member Plan
  • AARP Medicare Advantage Access HMO
  • Aetna Coventry (Aetna Medicare) HMO
  • Aetna HMO
  • Aetna Medicare HMO
  • Aetna Medicare POS
  • Aetna Medicare PPO
  • Aetna Medicare Value Plan PPO
  • Aetna NAP - PPO
  • Aetna Open Choice PPO
  • Aetna Premier Care Network
  • Aetna Select
  • Aetna Signature Administrators PPO
  • Aetna SmartCare
  • Aetna State of Illinois HMO
  • Aetna State of Illinois Open Access Plus
  • Aetna State of Illinois PPO
  • Aetna Value Performance Network
  • Beech Street Network PPO
  • Benefit Plan Administrators (BPA)
  • Benefits Services and Systems, Inc
  • Blue Advantage HMO
  • Blue Choice Preferred
  • Blue Cross Community MMAI
  • Blue Cross HMO Illinois
  • Blue Cross Med Select PPO
  • Blue Cross Medicare Advantage HMO
  • Blue Cross Medicare Advantage HMO-POS
  • Blue Cross Medicare Advantage PFFS
  • Blue Cross Medicare Advantage PPO
  • Blue Cross Medicare Supplement PPO
  • Blue Medicare Advocate Health HMO
  • Blue Precision HMO
  • BlueCare Direct
  • Cigna APWU Health Plan Open Access Plus
  • Cigna EPO
  • Cigna Healthspring True Choice PPO
  • Cigna HMO
  • Cigna Open Access Plus
  • Cigna POS
  • Cigna PPO
  • Cofinity PPO
  • Coventry / FirstHealth
  • Coventry Advantra Medicare HMO
  • Coventry Health Care HMO
  • Coventry Health Care Open Access POS
  • Coventry Health Care POS
  • Coventry Health Care PPO
  • First Health (Coventry) Rental PPO
  • First Health Network PPO
  • FirstHealth / Coventry Personal Care
  • Galaxy Health Network PPO
  • Great West Healthcare - Cigna EPO
  • Great West Healthcare - Cigna Open Access Plus
  • Great West Healthcare - Cigna PPO
  • HealthLink PPO
  • HealthSmart Preferred PPO
  • HST Care Connect EPO
  • HST Care Connect PPO
  • Humana Choice POS
  • Humana ChoiceCare EPO
  • Humana ChoiceCare POS
  • Humana ChoiceCare PPO
  • Humana Community Select HMO
  • Humana Gold Choice PFFS
  • Humana HMO
  • Humana Integrated Care Program of Illinois
  • Humana Medicare Choice PPO
  • Humana Medicare Gold Plus HMO
  • Humana National EPO
  • Humana National HMO
  • Humana National POS
  • Humana National POS - Open Access
  • Humana POS
  • Humana PPO
  • Illinois Health Connect
  • Imagine Health Smart Care
  • Medicare
  • MultiPlan PPO
  • SEIU – Local 4 HMO
  • SEIU – Local 4 PPO
  • Sunrise Advantage Plan
  • Tricare Prime
  • UFCW Local 1546 Health and Welfare Fund (UMC)
  • UHC / AARP Medicare Advantage Value HMO - POS
  • UHC / AARP Medicare Complete HMO
  • UHC / AARP Medicare Complete Plan 1 HMO
  • UHC / AARP Medicare Complete Plan 2 HMO
  • UHC / AARP Medicare Supplement
  • UHC / AARP MedicareComplete (Secure Horizons) HMO
  • UHC National Railway Carriers & United Transportation Union Health and Welfare
  • UHC Railroad Employees National Health & Welfare Plan
  • UHC/ AARP Medicare Advantage Choice PPO
  • UniCare PPO
  • Union Health Services, Inc.
  • Union Medical Care PPO
  • United Health One Golden Rule
  • United Healthcare Charter HMO
  • United Healthcare Choice Plus PPO
  • United Healthcare Core PPO
  • United Healthcare Group Medicare Advantage PPO
  • United Healthcare Indemnity
  • United Healthcare Medica
  • United Healthcare Medicare Complete Assure PPO
  • United Healthcare Navigate HMO
  • United Healthcare NexusACO OA
  • United Healthcare NexusACO R
  • United Healthcare Options PPO
  • United Healthcare Oxford
  • United Healthcare Select EPO
  • United Healthcare Select PPO

Ratings and reviews

Overall rating

based on 293 patient ratings.


July 23, 2020 10:01 AM

Everyone was very friendly/professional!!! Very happy except for when I woke up early.

July 23, 2020 10:01 AM

Very good except I woke up when the procedure was still going on not good!!!

July 8, 2020 4:13 PM

everything from the preprocedure office visit ,the procedure itself,and follow up discussions all went well.

July 8, 2020 11:36 AM

Would like to have gone over the procedure results and recommendations with the doctor before leaving. Had to contact him online ("my advocate") for questions & details.

July 4, 2020 10:11 AM

Dr Mazhar is a very compassionate doctor. He never makes us feels rushed and is very patient and kind.

July 4, 2020 10:11 AM

Dr Mazhar always makes sure my questions are answered and provides explanations re my complex health care issues.

June 22, 2020 10:06 AM

Visits with Dr. Mazhar are always very good would never change dr.'s.

May 27, 2020 6:54 AM

Does not make me feel hurried which enables me to remember what I want to discuss.

May 27, 2020 6:54 AM

He was calm, interested in my comments - even asked where my daughter was. He's very busy and was really special he remembered she usually came too!

May 23, 2020 2:16 PM

it was online visit. I think it worked well.

May 22, 2020 12:00 AM

Started late due to "newness" of video visits. Was nice to be able to still see provider for routine care with video visit. Staff kindly apologized for delay as they were adjusting to technology. Overall went very well given the circumstances.

May 22, 2020 12:00 AM

Previous to this visit 2 procedures were ordered by this doctor & performed. Had to call multiple times to get results and even then had problems. After this televisit getting info from this doctor was almost non-existent. Ridiculous.

May 12, 2020 9:05 AM

He listens to what you have to say.

May 6, 2020 8:25 AM

I find Dr. Mazhar very thorough & knowledgeable.

May 2, 2020 9:24 AM

Dr. Mazhar is an excellent physician!

May 2, 2020 9:24 AM

Due to the Covid-19, I had a phone visit with Dr. Mazhar. As always, he was prepare by knowing my health history, asked key questions and listen carefully to my symptoms and concerns. He prescribed very specifically how to take medication for my condition.

April 7, 2020 10:55 AM

The scheduling staff was very poor. They dropped my calls twice after being on hold for 15 minutes each time. Also, the prep prescription was not submitted to my pharmacy - They forgot.

April 6, 2020 5:28 AM

Doctor made an unpleasant procedure (colonoscopy) an easy painless procedure. Better than I envisioned.

March 25, 2020 10:10 AM


March 21, 2020 12:01 PM

For the brief time I met Dr. Mazhar, he was very professional and attentive. I will definitely return to him with any gastrointestinal problems in the future.

March 18, 2020 10:55 AM

excellent experience. I've been seeing this Dr for five years and always makes me feel comfortable not just a number.

March 18, 2020 10:55 AM

Always professional and always very informative. Always knows my health issues and knows about any new issues with my healthy

March 16, 2020 2:40 PM

Dr Mazhar listened very carefully to my health concerns and offered well thought suggestions to improve my condition.He is earnestly dedicated to finding answers.

March 2, 2020 11:38 AM

Interested in my wellbeing

March 2, 2020 11:38 AM

Very informative and helpful

February 27, 2020 10:19 AM

I give my highest rating across the board, from consult, thru scheduling and post / follow up.

February 27, 2020 10:19 AM

This was my 2nd procedure with this provider. each time the total experience has been outstanding!

February 13, 2020 11:00 PM

When I first called for this appt., it was because I needed to get established again w/a GI dr. because my former dr. retired. I was beginning to have some problems so I made my appt. In the meantime, I had a really serious event, a GI bleed, ended up in the hospital for 5 days, diagnosed w/large duodenal ulcer, so was glad to have this appt. I am very happy w/Dr. Mazhar, he listened, worked out a TX plan (endo) was very kind.

February 13, 2020 11:00 PM

My experience was good. Dr. was excellent. Everyone very kind. Would recommend him to everyone that needs a good GI dr.

February 5, 2020 11:22 AM

when I arrived I was told he was running 45 minutes behind but it was only about 30...... that's the life of a doctor.....

February 5, 2020 11:22 AM

Dr. Mazhar is very through and professional.

January 13, 2020 1:57 PM

Excellent provider - very knowledgeable, thorough and trustworthy

January 13, 2020 1:57 PM

A very positive experience

January 3, 2020 9:49 AM

I had a colonoscopy w/Dr. Mazhar. Team was very professional and made me feel at ease - Doctor was knowledgeable and made one feel at ease.

December 30, 2019 10:59 AM

it was a good experience. The only stressful part was when I called to inform the office I'd be 15 minutes late the operator said your only allowed a window of 10 minutes. my appt. was at 9. She said if I wasn't there by 9:10 I'd have to reschedule. Luckily I arrived by 9:08. I explained I was driving in from Wheatfield Indiana ....2 hours away...but I didnt feel that it made any difference. That was my "bad" experience. stressful

December 30, 2019 10:59 AM

I live in Wheatfield Indiana I moved here last year from Oswego il. Its a 2 hour drive. I think that in itself speaks volumes on my opinion of Dr. Mazhar's abilities.

December 26, 2019 8:33 AM


December 26, 2019 8:33 AM

Overall a pleasant experience.

December 21, 2019 1:02 PM

Outstanding. Knowledge, personable. Great "bedside manner".

December 21, 2019 9:39 AM

comfortable, considerate, informative, understanding, concerned for me

December 16, 2019 1:26 PM

Will recommend you guys To family and friends

December 10, 2019 5:22 PM

Outstanding practitioner !!!! I hope Advocate does everything possible to retain him on staff.

December 9, 2019 7:27 PM

Excellent experience.

December 9, 2019 7:27 PM

Excellent care by this provider, Excellent consideration for patient.

November 18, 2019 10:11 AM

Very conscientious and caring for my welfare.

November 18, 2019 10:11 AM


November 11, 2019 8:23 AM

Very good experience.

November 10, 2019 11:00 PM

Dr. Mazheer was great and we both agree I need to lose more weight and as long as my Gastro stuff stays in good shape then no Colonoscopy until 2022

October 27, 2019 7:00 PM


October 21, 2019 7:00 PM

It was a great visit and I really enjoyed It was a great visit and I was very impressed with Doctor Mazar

October 17, 2019 7:00 PM

This is my 3rd procedure in 3 years. The staff and nurses are always professional and caring. The doctor takes time to listen.

October 13, 2019 7:00 PM

I was very pleased with how Dr. Mazhar explained everything. Also that he was respectful and listened!!

October 9, 2019 7:00 PM

Dr. Mazhar was superior.

October 4, 2019 7:00 PM

the doctor was very professional and personable. he was late for the appointment due to another patient. I respect that he took time with the other patient as if it were me, I would have liked that he spent time with me and didn't rush off. he was behind and I don't know if he had other patients but he spent time asking questions and talking with me. he and his staff were very courteous.

October 1, 2019 7:00 PM

Dr. Mazhar is one of the finest doctors I have ever seen. He is kind, caring, supportive, and helpful. He is very knowledgeable and an expert in his field.

September 21, 2019 7:00 PM

I was happy with this visit and the procedure.

September 15, 2019 7:00 PM

It was a friendly informative meeting about my upcoming colonoscopy.

September 15, 2019 7:00 PM

excellent physician

September 15, 2019 7:00 PM

Dr. Mazhar is very professional and explains himself very well. I only see him once a year and he orders tests for me every 3-5 years. This visit was good just as I expected.

September 10, 2019 7:00 PM

Dr Mazhar is prepared for my visit demonstrated by comments and questions. He makes me feel a part of my health care decisions, he does not talk down to me and clearly explains his decision process.

August 29, 2019 7:00 PM

Very professional.

August 11, 2019 7:00 PM

Wonderful doctor. Always took time to explain everything to me.

July 29, 2019 7:00 PM

Dr. Mazhar is a good dr., takes time to help you understand the best treatment needed, very nice and professional.

July 28, 2019 7:00 PM

Very satisfactory. Dr Mazhar always listens carefully and asks questions regarding my health. He is always aware of my past healthhistory and treats me accordingly.He is very kind and thoughtful.I leave the office reassured that I'm in good hands.

July 28, 2019 7:00 PM


July 15, 2019 7:00 PM

Excellent visit and service provided. The dr. and his staff were very attentive to my needs and made sure I was comfortable during the procedure. Great positive energy projected by the entire staff.

July 7, 2019 7:00 PM

Very good this was for a colostomy.

June 18, 2019 7:00 PM

This provider has always been kind, knowledgeable & professional.

June 16, 2019 7:00 PM

Always a pleasant appointment with Dr. Mazhar, he is a great physician.

June 14, 2019 7:00 PM

very informative, thorough, polite, knowledgeable, sincere, caring, loved having him as my care provider

June 12, 2019 7:00 PM

I'm pleased that Dr. Mazhar scheduled my procedures after one consult considering my & my family's history. So many doctors schedule multiple consultations before doing the only procedures that will provide answers & treatment. I was a former patient of his.

May 23, 2019 7:00 PM

Dr Mazhar always presented himself as very thorough and knowledgeable. he seems to genuinely seem concerned with recommending what's best for me.

May 22, 2019 7:00 PM

Dr. Mazhar is an excellent health care professional.

May 15, 2019 7:00 PM

Good experience.

April 29, 2019 7:00 PM

excellent doctor and staff

April 28, 2019 7:00 PM

he was very great at everything when talking to me and he's an awesome doctor with caring and taking time with going over about what he wants to help figure out what to do help with my health I'm glad to have him as my doctor

April 22, 2019 7:00 PM

Dr. Mazhar is great, excellent care, very thorough and caring. Highly recommend him for gastro needs.

April 21, 2019 7:00 PM

He always answers any questions i have.

March 30, 2019 7:00 PM

Dr. Mazhar is such a good listener, I never feel rushed when I see him, I'm so glad I chose him when Dr. X retired.

March 17, 2019 7:00 PM

Dr. Mazhar is an excellent doctor and always takes the time to make sure I completely understand the status of my condition.

March 1, 2019 6:00 PM


February 22, 2019 6:00 PM

It was very good.

February 17, 2019 6:00 PM


February 1, 2019 6:00 PM

overall good

February 1, 2019 6:00 PM

Dr. Mazhar is always professional, patient and informative. I have no issue with this provider. however, my most recent clinic visits and phone calls to any provider since you became part of "Advocate" have been negative. Staff are far less personable, treated my like a number, sometimes curt, rude and condescending. Too bad you have lost your personal touch since the full merger with Advocate. As a healthcare professional myself with a high commitment to patient safety, quality care and satisfaction, very disappointing to see where healthcare has gone.....especially with your clinics.

January 30, 2019 6:00 PM

I had an excellent experience

January 29, 2019 6:00 PM

First visit - thought it went well.

January 29, 2019 6:00 PM

I went to him because he was highly recommended

January 29, 2019 6:00 PM

I had a colonoscopy. the doctor spoke with me both before and after the procedure to explain things. he used language that was easy to understand and took his time explaining things and fielding my questions.

January 26, 2019 6:00 PM

My visit to Dr. Mazhar's office was for the purpose of validating that it was appropriate to have an exploratory/preventative colonscopy which I am on a schedule of having every five years. I think Dr. Mazhar is a very good gastroenterologist and has a very positive, strong bedside manner or way in which he interacts with me and his other patients. His nurse who saw me first was also very pleasant and engaging. I've had nothing but positive experiences with Dr. Mazhar (true for my wife also). He is a wonderful specialist I see and I feel very comfortable in his care.

January 25, 2019 6:00 PM

I was extremely impressed when Dr. Mazhar came in that he already knew my medical history relating to my problem. Also, I was impressed that he was honest and up-front about not knowing exactly what was causing my problem but was willing to try something and asked me to come for a follow-up in two months. I would definitely recommend him to anyone.

January 25, 2019 6:00 PM

Well-informed on my history, and took it all into account.

January 24, 2019 6:00 PM

Excellent provider

January 24, 2019 6:00 PM

very comfortable with his explanation of Ct scan results.

January 20, 2019 6:00 PM

Dr Mahzar explains things well.

January 18, 2019 6:00 PM

The provider spent tons of time with me and really listened. I am very happy with his care.

January 13, 2019 6:00 PM

he is so nice, and very thorough...

January 13, 2019 6:00 PM

He was very kind to me .

November 27, 2018 6:00 PM

Dr. Sameer was very thorough. I am glad I chose him to do my colonoscopy. Thank you.

November 15, 2018 6:00 PM

Dr. Mazhar and all of the members of they Dryer surgery staff did an excellent job. They explained the procedure and were supportive and professional throughout the endoscopy.

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Information listed under the "clinical interests" columns was supplied by the physicians. It is provided to you for informational purposes only, and neither Advocate Health Care nor the Advocate facility has independently verified the information. If you wish to confirm the information contained herein, or if you have any other questions about a particular physician, please contact the physician’s office.

Unless otherwise stated, physicians are independent practitioners who are not employees or agents of Advocate Health Care or the Advocate facility where the care is being provided. Neither Advocate Health Care nor the Advocate facility shall be liable for the medical care provided or decisions made by these independent physicians.

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