John D. Nicolas, MD | Northwestern Medicine

Practice Focus Areas

This medical professional has a particular interest or expertise in:

Adult Medicine
Cancer Screening
Cholesterol Management
Chronic Disease Management
Comprehensive Primary Care
Diabetes
Hypertension
Preventive Medicine

Education

Medical Education:: MD, Loyola University Stritch School of Medicine - 1987
Residency:: McGaw Medical Center of Northwestern University - 1990

Board Certifications

American Board of Internal Medicine - Internal Medicine (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:: Northwestern Memorial Hospital

Ratings and Reviews

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Overall Rating

4.9

4.9

2438 Ratings

Reviews from Patients

100 Most Recent Reviews

Reviews from Patients

100 Most Recent Reviews

February 27, 2026

5.0

Kind, thoughtful, thorough excellent listener does not rush. Completely cares about his patience.

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February 26, 2026

5.0

Takes genuine interest in his patients and his attention to detail and thoroughness.

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February 25, 2026

5.0

He is an amazing doctor who takes his time and gives you his undivided attention.

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February 24, 2026

5.0

Takes time to ask and answer questions

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February 24, 2026

5.0

Dr Nicolas always provides beyond the medical knowledge and patient. It's made me feel better.

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February 24, 2026

5.0

Great doctor. Examines well and explains well

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February 19, 2026

5.0

Knowledgeable and compassionate physician

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February 18, 2026

5.0

Caring dr., who listens carefully to patient. Very thorough. Very nice. Very smart.

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February 17, 2026

5.0

There's none better

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February 16, 2026

5.0

As usual, Dr. Nicolas is very details , professional and knowledgeable. Makes me feel comfortable.

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February 14, 2026

5.0

He is really good; gives proper time, explains well and I trust his judgements.

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February 13, 2026

5.0

Dr. Nicolas is very knowledgeable, accommodating and efficient. He is very patient and explains every- thing clearly when I ask him ques- tions.

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February 12, 2026

5.0

Dr Nicolas takes the time to know his patients, understand their whole situation and works with me on medicals goals and situations. Very thorough!

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February 10, 2026

5.0

I have already recommended Dr. Nicolas to quite a few of my closest friends.

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February 10, 2026

5.0

I would recommend him to anyone. He is one of a kind.

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February 07, 2026

5.0

Great doctor. I've referred people to him in the past.

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February 05, 2026

5.0

Listens, caring, understanding

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February 04, 2026

5.0

Because he is an excellent and very professional doctor, accurate and dedicated to his profession.

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February 03, 2026

5.0

John Nicolas practices excellent preventive medical approach to dealing with visitor-patients.9

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February 02, 2026

5.0

He's awesome. Direct and to the point. He doesn't over prescribe anything.

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January 29, 2026

5.0

Very knowledgeable, practical and nice.

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January 27, 2026

5.0

He is very caring, listens to your concerns and makes decisions based on the best way to get you healthy. I love him...

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January 25, 2026

5.0

Dr. Nicolas gives the care to the patients, his knowledge, and bedside manner to the patients is a wonderful combination of empathy and compassion. His incredible insight made the patient feel more comfortable and confident about the care and attention needed.

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January 24, 2026

5.0

Dr. Nicolas, is very patient with his patients he takes his time in the visit

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January 23, 2026

5.0

Thorough, listens, never dismissive .

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January 21, 2026

4.0

Good

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January 19, 2026

5.0

Overall, I would absolutly recommend him because of his attention to details, but I would warn others that this can sometimes lead to waits because he is giving his other patients the same level of attention.

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January 16, 2026

5.0

I appreciate how meticulous he was

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January 16, 2026

5.0

Patient, thorough, responsive to questions, proficiency and professionalism all HIGH MARKS Compassion

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January 16, 2026

5.0

Dr Nicolas is very thoughtful and responsive individual to all your needs. You will feel better after meeting with him to discuss your needs.

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January 11, 2026

5.0

Thorough examinations, good communication and genuine concern.

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January 11, 2026

5.0

Excellent doctor. Dr. Nicolas is very thorough and very attentive. He really listens and gets to know you. He explains everything and works with you on all recommendations and decisions.

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January 07, 2026

5.0

Created an environment with direct questions seeking informational culture answers.

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January 06, 2026

5.0

He is knowledgeable, and he makes time to see his patients during emergency illness, even when given last minute notice. Today I had an unexpected medical emergency. I notified Dr Nicolas about 8AM and he saw me before noon on same day. He further followed up personally with other departments to ensure further tests are completed. Having a Dr who makes time to see a patient during critical medical needs is extremely important and it applies to all.

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January 05, 2026

5.0

Dr. Nicolas is very patience, and very knowledgeable. He interacts with the patience and is not in a rush.

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January 05, 2026

5.0

Excellent. Experienced physician who offers outstanding care

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December 30, 2025

5.0

Dr Nicolas gave me great examination and tests for the various viruses so he could determine how to best treat my illness.

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December 28, 2025

5.0

Outstanding care. Annual physicals and overseeing and health. Great confidence and trust in his care.

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December 20, 2025

5.0

He's pleasant and seems thorough.

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December 18, 2025

5.0

He is very thorough

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December 18, 2025

5.0

Wonderful Doc, very thorough, great bedside manner. Northwestern should feel lucky to have him.

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December 17, 2025

5.0

He is family doctor.

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December 17, 2025

5.0

thorough, professional, answers questions well

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December 16, 2025

5.0

Dr. Nicolas was very professional and helpful

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December 14, 2025

5.0

He is attentive and diligent.

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December 11, 2025

5.0

Always look forward to annual visit; Dr Nicolas provides excellent care. Experienced review of my health, records and discussion. Outstanding professional services!

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December 11, 2025

5.0

Dr. Nicolas is pleasant, professional, thorough and caring. He took the time to cheek in with me to let me know he would be back in a minute or two. My blood pressure was high and asked his student to take it again. It was even higher. Dr. Nicolas took it and when taking it he coached me to think joyful thoughts. As well, moved the chair I was sitting on away from the wall and asked me to place my feet flat on the ground. We have a plan for me to take my blood pressure and send him the results. Dr. Nicolas and his student walked me to lab to get my blood drawn. I felt very cared for and would highly recommend him.

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December 10, 2025

5.0

Extremely capable and caring professional.

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December 09, 2025

5.0

the best doctor excellent

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December 08, 2025

5.0

I have been going to Dr Nicholas for over 20 years he is a very good doctor

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December 07, 2025

5.0

Dr. Nicolas, always prioritize the best for the patient, his amazing and skills full of knowledge and experience develops the trust of the patient .

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December 05, 2025

5.0

Knowable and candid takes time to discuss issues in detail

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December 03, 2025

5.0

Incredible doctor!

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December 02, 2025

5.0

He is a good doctor and very flexible and makes the time to see me when I have urgent issues

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December 01, 2025

5.0

Very thorough and kind

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November 30, 2025

5.0

I had been under Dr. Nicolas care for almost about 30 yrs. My experience with him has been very satisfactory and rewarding. He is doing his job pretty well in his profession.

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November 26, 2025

5.0

Noted above. Very pleasant and detailed

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November 24, 2025

5.0

He has been very helpful

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November 22, 2025

5.0

Dr. Nicolas is an excellent doctor who truly cares about his patients

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November 20, 2025

5.0

Terrific doctor great patient interaction

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November 18, 2025

5.0

He is a good doctor.

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November 18, 2025

5.0

John D Nicolas is excellent discussing a patient's needs.

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November 14, 2025

5.0

He is competent and trustworthy. He addresses my concerns and explains things in a clear and understandable manner.

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November 14, 2025

5.0

Knowledgeable and compassionate physicians

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November 13, 2025

5.0

He's detailed and courteous

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November 11, 2025

5.0

Same as above answers plus Dr Nicolas listened to what I had to say.

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November 08, 2025

5.0

Professionalism, caring, and knowledgeable.

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November 05, 2025

5.0

Excellent patient care. Listens well and explains diagnostic impressions clearly.

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November 03, 2025

5.0

He is a wonderful doctor. his expertise, patience , dedication and kindness made a world of difference which brought me comfort and peace of mind.

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October 29, 2025

5.0

He took care and discussed everything

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October 28, 2025

5.0

Very patient and thorough

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October 22, 2025

5.0

He takes time and asks all the questions to make sure he understands everything. Great bedside manner.

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October 21, 2025

5.0

He goes over health care and recommends procedures that may benefit patient. He is caring and patient.

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October 20, 2025

5.0

Very detailed

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October 16, 2025

5.0

Proficiency + PATIENCE + Professional +

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October 16, 2025

5.0

Dr.Nicolas is very caring, understanding, physician.

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October 15, 2025

5.0

Thorough and efficient

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October 14, 2025

5.0

He is very personable. He remembers my family members and has always done well for my health.

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October 14, 2025

5.0

Kind listens takes his time and his treats his patients with respect

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October 14, 2025

5.0

Amazing caring physician

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October 09, 2025

5.0

Thorough Kind Informative

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October 06, 2025

5.0

Very thorough. Asks aging questions with concern.

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October 06, 2025

5.0

Dr. Nicolas listens to my concerns and is an excellent health coach.

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October 03, 2025

5.0

He has been my primary doctor for 20+ years

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October 02, 2025

5.0

Experience, knowledge, customer service, friendly.

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October 02, 2025

5.0

He is a rare and incredible doctor - covers all bases, the best.

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October 01, 2025

5.0

He is attentive , dies a thorough exam

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September 30, 2025

5.0

Takes his time evaluating you and answers all questions I have .

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September 30, 2025

5.0

Same as above, except I have had Dr Nicolas as my PCP for over 15 years

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September 29, 2025

5.0

Dr Nicolas is very thorough. I've been going to him for over 20 years and believe that he knows me well and is in the lookout for my best interests.

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September 29, 2025

5.0

I have recommended him to several people over the years

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September 29, 2025

5.0

Dr Nicolas was great! I was a first time patient at his practice and he went above and beyond in ensuring all my questions were answered and all my concerns were heard.

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September 27, 2025

5.0

Patient and a good listener.Helpful, useful suggestions.

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September 24, 2025

5.0

Superb care.

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September 24, 2025

5.0

Great care.

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September 24, 2025

5.0

He never shortchanges a patient. He takes the necessary time even if it means he might fall a little behind.

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September 23, 2025

5.0

Professional, thorough, and knowledgable.

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September 23, 2025

5.0

He is very good at what he does. I Highly recommend him.

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September 22, 2025

5.0

He is knowledgeable, great bedside manners, treat you like you are his only patient and cares about your health!

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September 22, 2025

5.0

Good listener and he really cares about his patients.

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Disclosures

John D. Nicolas, 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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