Kellyn R. Marks, MD | Northwestern Medicine

Education

Medical Education:: MD, Northwestern University Feinberg School of Medicine - 1993
Residency:: McGaw Medical Center of Northwestern University - 1996

Board Certifications

American Board of Internal Medicine - Internal Medicine (Certified)

Faculty Profile

Clinical Instructor, Feinberg School of Medicine

View Faculty Profile

Practice Groups and Affiliations

Medical Group:: Northwestern Medical Group
Alignment Category:: Northwestern Medicine Physician Network
On Medical Staff At:: 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.

Read Ratings FAQs

Overall Rating

5.0

5.0

2332 Ratings

Reviews from Patients

100 Most Recent Reviews

Reviews from Patients

100 Most Recent Reviews

February 27, 2026

5.0

Extremely likely. Dr. Kellyn R. Marks provides excellent, attentive care and takes the time to listen and explain everything clearly.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 27, 2026

5.0

She cares for her patients and is knowledgeable and provides great guidance for solutions of care.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 26, 2026

5.0

She is a great clinician

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 23, 2026

5.0

She listens and she's sincere.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 20, 2026

5.0

She is knowledgable and caring, listens to my concerns and recommends practical solutions

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 20, 2026

5.0

As above for 20 years

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 18, 2026

5.0

Dr Marks is compassionate, clear and smart

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 16, 2026

5.0

Takes her time with you and is not an alarmist

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 10, 2026

4.0

Listened to me and explained the reasoning for the new treatment

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 09, 2026

5.0

Professional and thorough care

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 09, 2026

5.0

Dr. Marks was a very pleasant person to talk to. She read my chart and asked relevant questions regarding current issues I'm experiencing. She listened to my concerns and proposed adding a new medication.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 04, 2026

5.0

She is very patient with me.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 04, 2026

5.0

Kind, not judgmental, she is patient and offers solutions.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 04, 2026

5.0

Dr. Marks answers every question you may have and is very thoroughly. Very professional!!!!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

February 03, 2026

5.0

She always listens.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 30, 2026

5.0

Dr. Marks is wonderful. She is a caring, conscientious doctor. She pays attention to patients concerns. I can't say enough good things about her. I feel very blessed to have her as my primary physician.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 30, 2026

5.0

Takes the time with patients and is thorough in answering questions

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 30, 2026

5.0

See above....and a nice understanding person.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 28, 2026

5.0

She's a fabulous doctor very thorough and I trust her

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 26, 2026

5.0

She listens and asks thoughtful questions and considers all aspects of my health.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 24, 2026

5.0

She explains your options for your illlness. Answers all your questions and never makes you feel like she's in a hurry!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 21, 2026

5.0

incredibly approachable

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 21, 2026

5.0

She is very easy to understand and cares about patients.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 20, 2026

5.0

Knowledgeable, professional, but also personable!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 20, 2026

5.0

I feel very fortunate to have Dr Marks in a world where people can't find or keep or get a decent internist without having to pay for concierge doctor service. She is always prepared and knowledgeable about any issues I've had and great at answering any questions. She is prompt with her appts but I never feel rushed through.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 20, 2026

5.0

I have been with Dr Marks for many years and I trust her judgment and recommendations and I always feel a part of the conversation and those decisions

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 20, 2026

5.0

She's been my doctor for over twenty years. That means something.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 16, 2026

5.0

Empathy

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 14, 2026

5.0

Dr. Marks is caring and attentive and one of the best doctors I know.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 13, 2026

5.0

Kind, thorough, approachable

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 10, 2026

5.0

Dr. Marks is an excellent primary physician.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 07, 2026

5.0

She is wonderful - kind, compassionate and listens.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 05, 2026

5.0

Without hesitation, extremely likely. Dr. Kellyn R. Marks is an exceptional physician whose expertise, compassion, and dedication to patient care are truly outstanding. Dr. Marks goes above and beyond_thorough, attentive, and genuinely invested in her patients' well-being. Dr.Marks is remarkable_knowledgeable, compassionate, and always takes the time to listen and explain with care and clarity.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 02, 2026

5.0

Dr Marks is so great! I feel incredibly fortunate to have her as my doctor. I trust her implicitly.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

January 02, 2026

5.0

Dr Marks is great! Very thorough and thoughtful.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 30, 2025

5.0

She's the best.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 27, 2025

5.0

I have been seeing her for almost twenty-seven years. She is there for you when you really need her. She is very knowledgeable. She is a great listener. I feel I get the best care from her. Her follow-through is incredible.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 26, 2025

5.0

Very caring and attentive

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 26, 2025

5.0

Dr Marks spent a lot of time with me answering a lot of questions and gave me advise on staying healthy

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 23, 2025

5.0

Dr. Marks is super responsive. She takes the time to discuss all concerns and look for possible solutions. The team in her office is great too.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 18, 2025

5.0

Dr Marks is and has consistently been professional and competent, and trusted. In addition, this visit I had a person who I'd not met before who took my temp and blood pressure. I thought she was unusually good.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 18, 2025

5.0

I recommended Dr Marks to my daughter and she is her PCP now. I would recommend Dr Marks to everybody who seek for professional health care... (in this confusing healthcare world.)Dr Marks is a knowledgeable doctor whose knowledge and experience is based on real medical science! I also take her advice on vaccines for 12 yers! and recommend everybody to do so!!!! NO SHARLATANS!!!!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 12, 2025

5.0

Dr Marks is one of the most thorough, empathic and evidence-based primary care doctors I know. It is always a pleasure seeing her and learning how to improve my health

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 11, 2025

5.0

She's so smart, thoughtful, accessible, supportive and solution oriented.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 11, 2025

5.0

She's patient and thorough b

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 10, 2025

5.0

Overall, Dr. Marks' practice (her and her team) is effective and efficient. Dr. Marks was thorough in reviewing my history and making sure I was up to date on tests and vaccines, and ensured I was prepared for upcoming procedures. I always feel that Dr Marks is treating the whole person during my visits.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 10, 2025

5.0

Very attuned to her patients

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 09, 2025

5.0

Dr. Marks is knowledgeable and attentive. She is personable and thorough.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 07, 2025

5.0

She seems to listen and give feedback wirh concern. Responds to questions

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 03, 2025

5.0

Dr Marks always takes the time to listen and co-create an evidence based plan of care. In addition she is always running on time _ I don't know how she does it because her appointments never feel rushed.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

December 01, 2025

5.0

Dr Marks is my PCP since 2014 .. ever since I moved to IL from Mi. Dr Marks is a professional heath care provider at the highest level.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 24, 2025

5.0

Thorough

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 22, 2025

5.0

Attentive, responsive, personable.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 22, 2025

5.0

She is the best! She always listens and discerns the best possible treatment.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 22, 2025

5.0

She is caring, patient, and through. She takes time to discuss concerns and answer questions.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 20, 2025

5.0

She's excellent!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 19, 2025

5.0

Excellent provider, great communicator

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 19, 2025

5.0

Always sound advice. Very efficient.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 18, 2025

5.0

Dr. Marks has always been so empathetic with me and I feel like has experience with some of the same issues I face, so I have confidence in her ability to help me. It's a great comfort when you really connect with your doctor.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 14, 2025

5.0

She reviews your health records with patience and makes sure I have taken care my preventative maintenance.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 13, 2025

5.0

I find Dr. Marks to be very caring, empathetic an incredibly professional in her treatment practices

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 10, 2025

5.0

I was able to get in fairly quickly and she took her time examining me and answering my questions.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 07, 2025

5.0

Thorough. Personable. Knowledgeable. Reassuring.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 06, 2025

5.0

She's been my primary care physician for over 20 years_great doctor!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 04, 2025

5.0

Expertise

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 03, 2025

5.0

She's got a wonderful bedside manner and concern and care about me personally

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

November 01, 2025

5.0

She is thorough, knowledgeable and caring.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 31, 2025

5.0

I have seen Dr Marks since I was 23 years old. I trust her completely and know that she has my best interests at heart. Personable, knowledgeable but yet efficient. Love her!!!!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 30, 2025

5.0

She listens well and talks through appropriate solutions and recommendations.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 30, 2025

5.0

Dr. Kellyn Marks is always an excellent compassionate and trusted physician. I've valued her for years.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 29, 2025

5.0

I really like Dr. Marks., she seems very smart and always takes her time with me.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 28, 2025

5.0

I have been seeing Dr. Mark's for years. She's so professional, kind, attentive and always answers all my questions. She has a great bed side manner.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 28, 2025

5.0

Dr. Marks listened to my concerns & provided sound advice. She diagnosed the problem & submitted a prescription to help ease the pain I was experiencing. She explained I should have come to her first, since I went to the dermatologist first. But I had no way to self diagnose that I had shingles, especially since I'd had both shingles vaccine shots.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 27, 2025

5.0

Dr. Marks is friendly, informative, knowledgeable and thorough

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 25, 2025

5.0

Dr. Marks is compassionate and takes into account my opinion on my health choices.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 24, 2025

5.0

Outstanding debt of knowledge. Listens and explains plan of action

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 23, 2025

5.0

Dr Marks is the best. I have been seeing her for years and my parents also. She is a trusted part of my family. She is up to date w the newest medicine and I trust her recommendations completely. Her bedside manner and compassion is unmatched. She has a way of covering everything but making it seem like we have all afternoon. Gives great advice. I never feel rushed. Grateful to have her as my Dr. and think she is one of a kind.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 22, 2025

5.0

Dr. Marks is very thorough!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 21, 2025

5.0

Dr. Marks is a very talented, knowledgeable and compassionate internist.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 18, 2025

5.0

Dr Marks is an excellent doctor

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 14, 2025

5.0

Caring

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 13, 2025

5.0

I know she has my best interest in mind. Also - she's very personable.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 09, 2025

5.0

Dr Marks is a great doctor and I am glad that I've had her as my PCP for 15yrs. She does explain her reasoning for things and even if I don't always agree, I respect her opinion very much.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 08, 2025

5.0

She has been my doctor over some years and she has been the very best . Proactive in my care

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 05, 2025

5.0

I have been a patient of Dr. Marks for years. She is great.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 04, 2025

5.0

I've been going to Dr Marks for 30 years. She's the best intern.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 03, 2025

5.0

She listens and then acts accordingly

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

October 01, 2025

5.0

She is a fabulous knowledgeable and caring physician. I have been with her for almost 20 years!

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 30, 2025

5.0

She's very knowledgeable and empathic, very skilled physician.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 25, 2025

5.0

She is so thorough and includes me in my health care

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 24, 2025

5.0

She is great

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 22, 2025

5.0

she never avoids the hard discussions, is compassionate yet transparent with her care, never any question as to what is going on or what is next with her

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 22, 2025

5.0

She is smart, pragmatic, and compassionate.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 22, 2025

5.0

She is both efficient and humane.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 21, 2025

5.0

Very good listener and keeping tabs on my health.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 18, 2025

5.0

Dr K Marks has been my doctor and my family's doctor for 30 years and we just love her. She is to thorough, kind, caring and overall just a wonderful person and a great physician.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 17, 2025

5.0

she is the best, so knowledgeable and cares.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 10, 2025

5.0

See above item. Dr. Marks is a very thorough professional who connects well with patients.

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 07, 2025

5.0

Answered my questions, explained things clearly, understands my health issues and offers excellent health care

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

September 07, 2025

5.0

Knowledgeable,professional, personable

Was this helpful? Yes (0) No (0)

Thanks for your feedback!

Disclosures

Kellyn R. Marks, 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.

View More Disclosures