Steven C Harnack, MD

Specialty: Internal Medicine

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Advocate Medical Group

2285 Sequoia Drive

Aurora, IL 60506

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Office: 630-859-6910

Fax: 630-859-6811

Meet Steven C Harnack, MD



  • Residency: Mercy Hospital & Medical Center
  • Medical School: University of Illinois College of Medicine

Board certifications

  • Internal Medicine

Hospital affiliations

  • 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 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 450 patient ratings.


March 27, 2020 5:25 AM

I don't appreciate waiting inside the room for 45minutes the doctor could be busy but somebody (like nurse) should know know of the _____ & provide status update on the wait time.

March 27, 2020 5:25 AM

I like my doctor but hate sitting inside the room for over 45 minutes waiting for the doctor to show up.

March 23, 2020 8:19 PM

Went well

March 23, 2020 7:47 AM

Good doctor - Puts one at ease.

March 16, 2020 3:31 PM

Dr. Harnack is a great listener and very friendly. I really like him as my doctor.

March 16, 2020 12:49 PM

Dr Harnack listened to my concerns and was very respectful.

March 14, 2020 2:50 PM

He listen to you

February 24, 2020 4:42 PM

Dr. Harnack always takes his time with me and I NEVER feel like I have been rushed through. I feel I can talk with him about any problem I may have .

February 13, 2020 12:39 PM

Good visit, got to the point of visit answered all my questions.

February 7, 2020 7:51 PM

very good

February 7, 2020 7:51 PM


February 1, 2020 6:00 AM

Being a medical person, I understand what a professional is saying & not plain talk. As long as I have gone to Dreyer clinic (1959-2020) I have NEVER been treated badly. (I am a vegetarian.)

January 30, 2020 2:50 PM

I have such respect for Doctor Harnack, I never feel rushed and he is very polite and explains things very well. Thankful that I have a great doctor especially as I am nearing 80 years of age.

December 29, 2019 6:13 PM

Dr Harrneck was very concerned about my health, wellness.

December 29, 2019 6:13 PM

Goog experience

December 28, 2019 1:52 PM


December 27, 2019 8:06 AM

Dr. Harnack excellent dr.

December 23, 2019 10:00 AM

Easy to talk to. Makes you feel at ease while in his office.

December 14, 2019 10:17 AM

It was good.

November 11, 2019 11:00 PM


October 27, 2019 7:00 PM

Dr. Harnack is a wonderful doctor. He truly cares about his patients.

October 24, 2019 7:00 PM

This last visit I waited an hour before seeing doctor.

October 21, 2019 7:00 PM

Been with him for the last 28 or 29 years. Like him alot.

October 20, 2019 7:00 PM

Very good doctor.

October 20, 2019 7:00 PM

I am a newer patient to this provider. my previous provider asked alot more questions to see how things were going, trying to see if anything further was going on, I did not get that from this provider. previous provider went over blood work with me this provider just said blood work was fine and moved on.

October 17, 2019 7:00 PM


October 14, 2019 7:00 PM

After a test came back negative they just wrote me off even though I told them I still had issues especially a low grade fever and diarrhea. Very upset they are letting me just hang even after I told them I was still sick.

September 11, 2019 7:00 PM

I have been seeing Dr. Harnack for several years and always receive excellent care. Dreyer is very fortunate to have him or staff here!!

September 9, 2019 7:00 PM

Excellent, always helpful, thank you.

September 4, 2019 7:00 PM

Awesome - He's always willing to listen and really cares!!

August 25, 2019 7:00 PM

Love Dr. Harnack and his down to earth personality and yet he does what needs to be done.

August 23, 2019 7:00 PM

Very good. I needed a new primary doctor for me and my wife and he provided it.

August 19, 2019 7:00 PM

He gave me insight on how to lower my cholesterol level.

August 18, 2019 7:00 PM

Good visit.

August 18, 2019 7:00 PM

Been seeing Dr.Harnack for years, very pleased with him,even recommend him to 2 guys at work, both see him now too!

August 16, 2019 7:00 PM

very good. He was concerned about my cholesterol and we discussed diet andhow and what I should do to reduce my levels.

August 11, 2019 7:00 PM

Excellent as usual.

July 21, 2019 7:00 PM

Better than expected.

July 12, 2019 7:00 PM

A very helpful visit with this provider.

July 9, 2019 7:00 PM

We've always had good experience with Dr. Harnack. He has my primary since Dr. David Lucks left Dreyer.

June 16, 2019 7:00 PM

he was in the room about 5 minutes. did one thing to examine my hips. didn't bring up last visit which had a significant health issue.

June 12, 2019 7:00 PM

Good experience.

May 3, 2019 7:00 PM

I always feel Dr Harnack has helped me with my health issues every visit or gives me advice to try new procedures.

April 28, 2019 7:00 PM

Dr. Harnack is a new provider for me, since my previous provider is no longer available. He was very thorough, a good listener, and understanding.

April 28, 2019 7:00 PM

gained good information on things I might want to do.

April 22, 2019 7:00 PM

Like Dr Harnack.

April 17, 2019 7:00 PM

I really like Dr. Harnack.

April 14, 2019 7:00 PM

Dr. was visibly upset that I brought up my opinion for trying an alternative homeopathic/natural new prescription and drop the old one.

April 14, 2019 7:00 PM

Dr. Harnack is great!

March 30, 2019 7:00 PM

He met my needs.

March 22, 2019 7:00 PM

Dr. Harnak is a kind and understanding doctor. I believe he has a good understanding of me as a patient and offers alternative solutions other than medications. He has the experience of wearing different hats as a doctor. He is a good listener and a pretty funny too.

March 17, 2019 7:00 PM

Dr. Harnack is always helpful

March 17, 2019 7:00 PM

took time to answer my questions and did some checking of skin problems etc. it's always been a good relationship.

February 24, 2019 6:00 PM

Very good.

February 17, 2019 6:00 PM

I recently moved to the area and am looking for a new GP. I felt quite at ease with the doctor and thought he listened to me. He offered great information and we had pleasant conversation related to medical issues. I now have a new GP and it is Dr. Harnack.

February 17, 2019 6:00 PM

Dr . Harnack is an excellent doctor. He answers all my questions and answers e-mails quickly. I would recommend him to ly friends and family. He treats me respectfully and answers any questions I might have.

February 11, 2019 6:00 PM

As usual, I had a list of questions for discussion. He listened to my questions and discussed each one. Wonderful experience!

February 11, 2019 6:00 PM

The doc was great as well as all I came in contact with.

February 4, 2019 6:00 PM

Front counter where you check in was very slow last visit the provider is doing a good job with my

January 29, 2019 6:00 PM

She is always confident with Dr. Harnack.

January 29, 2019 6:00 PM

appt was for significant dizziness. was told it was likely vertigo, but given no info as to why or what to do about it. I'm coming in again this week with my primary doctor, who I can rarely get an appt with, as it hasn't improved. This appt was a waste of my time.

January 29, 2019 6:00 PM


January 29, 2019 6:00 PM

Doctor helped me with decisions about my future health.

January 28, 2019 6:00 PM

very good

January 27, 2019 6:00 PM

I have been with my provider for many years. feel very confident about his care and quite comfortable in his presence. he seems very caring and always listens to me.

January 27, 2019 6:00 PM

very good

January 27, 2019 6:00 PM

Cares about my health and well-being more than I do. which is good.

January 27, 2019 6:00 PM

Tech was very friendly and put me at ease checking me in and getting vitals. Dr came in also very nice. We talked and I was very satisfied. Set up my next appointment.

January 25, 2019 6:00 PM

Been seeing Dr.Harnack for years, very glad he's my doctor, I even recommended him to two friends now he's thier doc too!

January 24, 2019 6:00 PM

Dr. Harnack is always very personable, knowledgeable and attentive to any questions/concerns I have and very helpful w/referring me to other doctors, therapists for specific issues that come up.

January 13, 2019 6:00 PM

This was my "transition visit" after my 37 year relationship with Internist and friend X had ended with his retirement 6 months earlier. I was very pleased with Dr Harnack, although a bit disappointed when the two referrals had not gone through in 5 weeks, allegedly due to Advocate computer transitioning.

November 29, 2018 6:00 PM

Very good.

November 15, 2018 6:00 PM

The best ever.

November 15, 2018 6:00 PM

Have seen him for years, and we communicate well. If we didn't, I'd move on.

November 10, 2018 6:00 PM

Excellent Doctor.

November 8, 2018 6:00 PM

My Primary care physician retired in June. This was my first visit to officially establish Dr Harnack as my new primary care Physician. I am very happy with him, his level of competence and care and how I was treated.

October 16, 2018 7:00 PM

Exceptional - my highest evaluation!

October 6, 2018 7:00 PM

great experience

September 18, 2018 7:00 PM

This was my first visit. We talked for about 15 min. He only checked my heart and lungs. He did not discuss my blood test which was taken a week before the appointment.

September 16, 2018 7:00 PM

always concerned, never in a hurry. down to earth advice. Great guy

September 15, 2018 7:00 PM

Dr. Harnack, keep up the great work. I am grateful to have you as my health care provider.

September 15, 2018 7:00 PM

I feel that the provider doesn't do as much as they use to do years ago.

September 10, 2018 7:00 PM

It was a pleasure to meet Dr. Harnack. He was very polite, soft-spoken, and did a great job during my wellness check. He renewed prescriptions, ordered all the future procedures that I will need, and listened to my "getting old complaints."

September 10, 2018 7:00 PM

very pleased with the short wait time.

August 22, 2018 7:00 PM

He was very nice and helpful - Friendly and explained everything in understandable terms.

August 20, 2018 7:00 PM

Dr. Harnack is patient, kind and he notices things about you that other doctors do not. He has an easy-going demeanor, yet states what is important for good health. I felt he listened and understood me and my health care.

August 13, 2018 7:00 PM

He is a very caring person and competent but completely over-worked and over-scheduled.

July 16, 2018 7:00 PM

Dr. Harnack, excellent dr., caring, listening to all questions! Been with him for years!

July 2, 2018 7:00 PM

Since becoming Advocate, you do not allow the Dr. enough time for each appt. They are rushed through the appt. time. It's just not the same as it was when they were just Dreyer Medical.

June 19, 2018 7:00 PM

Dr. Harnack has been my doctor for many years and I am very satisfied with his care.

May 28, 2018 7:00 PM

Dr. Harnack is always easy to talk with.

May 21, 2018 7:00 PM

I always receive excellent care from Dr. Harnack and his office staff! I am very happy that Dr. Harnack is on the health team here!

May 8, 2018 7:00 PM

I appreciate Dr. Harnack.

May 5, 2018 7:00 PM

It was a very nice visit.

May 1, 2018 7:00 PM

Dr. Harnack has my complete and total confidence, he is a consummate professional, THOROUGH, HONEST and compassionate.

April 30, 2018 7:00 PM

Nurse/assistants have always been very good/personable and attentive to questions and observations.

April 23, 2018 7:00 PM

Dr. Harnack has been our provider for many years. We are very happy with him.

April 20, 2018 7:00 PM

Dr. Harnack is always courteous and easy to talk to, and he listens to my concerns and answers them clearly. I feel that I have a very good doctor.

April 18, 2018 7:00 PM

Dr. Harnack is great. He does good work and cares for both my wife and me.

April 14, 2018 7:00 PM

great doctor

My health enews articles


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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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