Robert A. Bayer, MD

5.0

1709 ratings Read Reviews

Northwestern Medical Group

Primary Specialty

Hematology and Medical Oncology

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Practice Focus Areas

This medical professional has a particular interest or expertise in:

Education

Medical Education:: MD, Northwestern University Feinberg School of Medicine - 1984
Residency:: University of Illinois College of Medicine at Chicago - 1987
Fellowships:: Loyola University Medical Center - 1992

Languages Spoken

German

Board Certifications

American Board of Internal Medicine - Internal Medicine (Certified)
American Board of Internal Medicine/Hematology - Hematology (Certified)
American Board of Internal Medicine/Medical Oncology - Medical Oncology (Certified)

Faculty Profile

Clinical 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

Kishwaukee Hospital

Valley West 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

5.0

5.0

1709 Ratings

Reviews from Patients

100 Most Recent Reviews

Reviews from Patients

100 Most Recent Reviews

February 27, 2026

5.0

Very thorough and knowledgeable.

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February 26, 2026

5.0

I absolutely love Dr Bayer, he's diligent and thorough, explaining every detail of my care and test results. I feel extremely blessed to have him as my doctor.

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February 23, 2026

5.0

The best!

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February 18, 2026

5.0

The man actually talks to you like doctors did years ago. He knows what I need to know.

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February 11, 2026

5.0

He orchestrated the cancer team responsible for extending my life!

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February 03, 2026

5.0

He's is super personable and took his time with our visit, not rushed at all.

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February 02, 2026

5.0

Dr. Bayer is knowledgeable.

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February 02, 2026

5.0

Listened

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January 28, 2026

5.0

He takes time to explain everything and answers all your questions.

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January 23, 2026

5.0

Dr. Bayer cares for the patient and explains all well. Never talking down to the patient, respects patients' intelligence.

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January 15, 2026

5.0

Dr. Bayer is the only provider (out of many) that has charted 100% accurately in my care. He advocates for his clients to high regard. He does not gaslight or minimize, taking patient concerns at face value. He provides a deep, analytical approach at identifying potential untreated concerns and solutions. He consults regularly, recognizing potential clinical biases or any areas outside ONC scope, and rules out unidentified issues with supporting data to justify the case. This being said, his clinical impressions and treatment planning work is far above the average physician nowadays. He also shows up as just another human- great bed side manner, uses humor, and explains simply. I will be very sad to see him go upon future retirement!

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January 12, 2026

5.0

First class doc

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January 08, 2026

5.0

Dr Bayer and his team are great. Dr Bayer was thorough and took his time with making sure we understood regarding my care.

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January 05, 2026

5.0

Very nice. Explains everything in detail.

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December 30, 2025

5.0

He listen and is very caring!

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December 23, 2025

5.0

I needed a physician with experience with male breast cancer. He is absolutely the doctor having that and will give you his time, opinions and treatment plans.

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December 21, 2025

5.0

He's the best. Takes time to go over all your results top to bottom, explaining them so you understand. I'm lucky to have him for my doctor.

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December 20, 2025

5.0

Good doctor

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December 19, 2025

5.0

I told him to treat me as if I was his son. And I feel like he is

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December 18, 2025

5.0

He is very thorough with your results of your lab work and any other kind of test you would have done. He takes is time with questions making sure you understand every little detail. And he is that Dr. if he is running late for your appointment that you now that it is not a good day for other patient or patient's. I will recommend him to anyone going through cancer. I see is heart every time I'm in the room.

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December 17, 2025

5.0

Great doctor and really good people skills!!!

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December 15, 2025

5.0

He is the best

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December 14, 2025

5.0

Very caring and wants all tests completed from his own team before moving forward

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December 11, 2025

5.0

He's the best.

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December 10, 2025

5.0

Very engaged in my care. Thorough and professional and personable.

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December 08, 2025

5.0

He is an amazing oncologist and a great person. Doctor listens and gives me feedback.

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December 04, 2025

5.0

Dr explained everything and didn't sure. He made sure we understood the best we could have what he was looking for and why. Again, we felt very comfortable there.

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December 03, 2025

5.0

Dr Bayer is the most knowledgeable and most thorough doctor that I have been associated with across both my wife's and my own medical needs.

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December 02, 2025

5.0

Because of our trust and faith in Dr. Siddiqui....for suggesting Dr. Bayer as his replacement, "told us" that he would be a good Dr. for both of us.

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December 02, 2025

5.0

He is through, caring, and very attuned to patient needs.

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November 26, 2025

5.0

He has a great deal of experience and knowledge. He is respectful and personable, and listened to what I had to say.

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November 25, 2025

5.0

Very smart and thoughtful. Every time I see him I leave feeling happy and relaxed.

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November 23, 2025

5.0

Knowledgeable. Exceptional bedside manners. Listens and addresses patients concerns.

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November 19, 2025

5.0

There are no words to explain the reasons why he is the best physician. He has deep knowledge of the field, he is able to explain all aspects of the treatment, and he has a great sense of humor.

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November 19, 2025

5.0

He's thorough and informative and gets the job done

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November 19, 2025

5.0

he is the absolute best doctor.

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November 18, 2025

5.0

Has time for me when I am in his care

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November 18, 2025

5.0

He is extremely thorough

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November 17, 2025

5.0

Dr. Bayer keeps up on all the latest advancements and really cares for his patients.

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November 17, 2025

5.0

Dr Bayer is a joy to deal with, and very patient with my questions. His explanations are detailed and easy to understand and I actually enjoy my appointments. He's also very conscious of the expense of my medication and offers various options to make it more affordable.

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November 16, 2025

5.0

Caring for his patients. Gives good information, doesn't talk down to his patients, respects their intelligence.

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November 04, 2025

5.0

Excellent Dr

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November 03, 2025

5.0

Dr. Bayer is wonderful. He fully explains test results and what the next steps are.

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November 03, 2025

5.0

He is personable, knowledgeable and a great listener.

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November 03, 2025

5.0

Dr. Bayer is personable, takes time to listen and takes time to explain. He truly cares about his patients.

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November 02, 2025

5.0

Explain each step

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November 01, 2025

5.0

He's great! Stays on top with what's going on with his patients. Very easy to talk to.

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October 31, 2025

5.0

Dr Bayer is an excellent Dr and thank him for the past year plus of treatment. I would recommend him highly.

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October 26, 2025

5.0

Dr Bayer is very thorough of going through all my tests and explaining the meaning of the findings. I never feel rushed.

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October 25, 2025

5.0

Very knowledgeable!

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October 23, 2025

5.0

addresses my questions and needs with clarity and empathy

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October 22, 2025

5.0

Very thorough!

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October 22, 2025

5.0

Great doctor

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October 06, 2025

5.0

Dr. Bayer is top in his field, and Northwestern Medicine is fortunate to have him.

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September 30, 2025

5.0

He's so nice and very thorough. He takes the time to explain every detail and answer every question. I would recommend him to anyone who needs this type of care.

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September 24, 2025

5.0

Very thorough and informative

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September 19, 2025

5.0

Dr. Bayer is a brilliant MD with great care and compassion for his patients.

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September 19, 2025

5.0

Very knowledgeable and excellent "bedside manner"

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September 17, 2025

5.0

Dr. Bayer is #1 in book !!! He save my life TWICE !! As I said before he is wicked SMART & when fighting cancer he is the Dr. you want on your team

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September 15, 2025

5.0

He is awesome. Always thorough and never in a hurry.

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September 14, 2025

5.0

He's been my oncologist since 2008. I love Dr Bayer!! he also was my husband's oncologist. He is the best!!

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September 03, 2025

5.0

If Dr. Bayer wasn't retiring I'd advise everyone to go to him. Warm wonderful professional Doctor that I will miss!

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August 30, 2025

5.0

He will take time to help you for all your needs

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August 27, 2025

5.0

He takes time to help his patients understand their health issues.

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August 25, 2025

5.0

One of the most intelligent doctors I have ever worked with

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August 23, 2025

5.0

Very good doctor

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August 23, 2025

5.0

He literally saved me from "deaths door" and respected my religious beliefs for my treatment care!

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August 22, 2025

5.0

He is a great Doctor. Answers my questions and goes over my blood work. Am so glad I did treatment he recommended.

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August 19, 2025

5.0

Dr Bayer is the best doctor ever. Knowledgeable beyond belief, kind, caring ,compassionate. He's truly a person on the right profession.

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August 18, 2025

5.0

Doctor Bayer is so caring & knowledgeable about my MDS cancer care & works with NW Chgo Doctor Abaza closely! Outstanding care!

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August 17, 2025

5.0

Dr. Bayer is an excellent Doctor. He explains everything very well. I will miss him when he retires. He is very knowledgeable and doesn't leave anything to chance.

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August 15, 2025

5.0

He's absolutely the best!!

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August 13, 2025

5.0

He takes his time with me and goes over all my blood work. He seems to really care about me

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August 12, 2025

5.0

Appreciate his straight forward approach,clear explanations and sense of humor.

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August 11, 2025

5.0

Most accommodating and thorough. I felt that he was very thorough.

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August 08, 2025

5.0

From the time I walked in, until I left, everyone was so pleasant and helpful .

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August 07, 2025

5.0

Proffessionalism

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July 29, 2025

5.0

He is just a caring person who listens and makes sure you understand what one needs to do tog et better

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July 29, 2025

5.0

Dr Bayer is an excellent physician and human being. His skills are outstanding. He is an excellent diagnostician. Great communication skills. Empathetic and compassionate.

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July 27, 2025

5.0

What can I say? He is the absolute best! His compassion is outstanding, he takes his time and explains every test result. He has helped me so much during my journey. I'm blessed to have him as my doctor

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July 26, 2025

5.0

Same answer as above. He is the reason I come there for my care

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July 23, 2025

5.0

Excellent and thorough care.

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July 23, 2025

5.0

He is compassinate, direct and extremely knowledgable

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July 22, 2025

5.0

He spends time to explains your condition clearly, details on care, asks if you have any issues, or questions.

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July 17, 2025

5.0

Very knowledgeable, detailed and focused on my treatment.

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July 15, 2025

5.0

The best doctor I have ever been associated with for my medical situation. Would recommend him to anyone needing his specialty.

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July 04, 2025

5.0

Dr Bayer takes the time to explain everything so I understand.

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July 02, 2025

5.0

Very knowledgable, caring, up to date on many things.

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July 02, 2025

5.0

Gives Thorough explanations and answers to my questions regardless of what they are. Amazing at what he does!!

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June 27, 2025

5.0

He is FANTASTIC, finally a diagnosis.

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June 26, 2025

5.0

He is a very caring doctor he explains everything to me so I can understand exactly what he is saying.

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June 25, 2025

5.0

Proffessionalism

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June 23, 2025

5.0

I would recommend him to everyone. He's the best.

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June 23, 2025

5.0

He as well took time without feeling rushed

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June 21, 2025

5.0

Dr. Bayer is an amazing Dr and I would recommend anybody to him, he is ontop of everything and I have absolutely no regrets at all coming to him.

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June 20, 2025

5.0

He was extremely thorough and informative. He listened to what I had to day.

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June 19, 2025

5.0

Excels

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June 19, 2025

5.0

Dr.Robert Bayer is brilliant !!!! He saved my life twice ! He tells you the truth right from the beginning and it's up to you and modern medicine on this amazing journey to complete recovery He leaves no stone unturned

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June 16, 2025

5.0

Down to earth and makes you feel comfortable

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June 12, 2025

5.0

Proffessionalism

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Disclosures

Robert A. Bayer, 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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