Brendan Thomas, MD

Specialty: Dermatology

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Advocate Medical Group

80 Templeton Drive

Oswego, IL 60543

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Office: 630-554-3456

Fax: 630-551-2810

Meet Brendan Thomas, MD

About me



  • Cedarville University
  • University of Illinois at Chicago College of Medicine
  • Saint Francis Hospital
  • Loyola Chicago Stritch School of Medicine

Board certifications

  • Dermatology

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 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 667 patient ratings.


July 27, 2020 9:19 AM

Provider is a dermatologist - he was very helpful and thorough. We appreciated him seeing us. We usually see Dr. X.

July 27, 2020 9:19 AM


July 22, 2020 7:48 PM

Dr. Thomas explained everything very clearly and understandably. He listened to everything that I had to say. I really liked and trusted him.

July 22, 2020 7:48 PM

Excellent experience!

July 20, 2020 9:52 PM

Dr Thomas was very warm and personable. I felt I was able to discuss my concerns without difficulty. Was able to get me in to see him in a timely manner. Whole experience went smoothly.

July 20, 2020 9:52 PM

Dr Thomas seemed genuinely concerned about my issue, I felt he spent a great deal of time with me. He was very reassuring when I had questions about starting a new medication. I saw him for a second opinion but may opt to continue to follow with him in the future.

July 20, 2020 1:43 PM

provider is great and the only one I see at dreyer love himI go elsewhere for primary care in general do not like dreyer the phone system is AWFUL - why do I. red to tel the receptionist with minimal or no medical training what I need to the tee every single time - frustrating

July 18, 2020 7:08 PM

it was a positive visit

July 18, 2020 7:08 PM

I have complete confidence in Dr. Thomas and he has always helped us.

July 13, 2020 5:03 PM

Dr. Thomas was very kind, attentive and informative.

July 13, 2020 5:03 PM

He was patient and did not rush me and gave me a clear explanation of what treatment was available

July 4, 2020 8:50 AM

This provider has seen a couple of my children and I am switching to see him myself now too. I have also recommended him to friends. He now is only out of the office that is the furthest facility from North Aurora where we live which was a bummer to find out as a busy mom BUT I did not hesitate for a second to continue to see Dr. Thomas because he is worth the drive!! He is excellent and Dreyer should do everything possible to continue to have him on staff. Thank you Dr. Thomas for always making us feel so comfortable, heard and well taken care of. You are one of the good ones and we are so thankful to have you!

July 2, 2020 12:00 AM

Great visit.

June 29, 2020 5:57 PM

Dr Thomas is very attentive, kind and thorough. He is patient and listens to concerns. Very thorough with explaining procedure and pain control during procedure.

June 22, 2020 10:23 AM

This was during the COVID-19 lockdown. I felt like a leper! The battery of questions, the distancing, the lack of people at the facility, the red tape on chairs, the brisk treatment from the receptionist regarding the questions I'd been ask at the front door. The wearing of masks. This was 2 months into the lockdown & ridiculous. But this is Illinois & everything has become politicized. I don't blame my WONDERFUL doctor for any of this - of course, he has nothing to do with it. I was, however, VERY thankful that I could get in right away, because the matter was urgent.

June 22, 2020 10:23 AM

Dr. Thomas is one of my absolute favorite doctors! He's the best! He is caring, conversational, he remember my family, and he's very smart & good at what he does. I pray he neve leave. We LOVE him!

June 12, 2020 1:34 PM

Excellent experience! Dr. Thomas and his staff are superb professionals who treated me with care and consideration for a raised mole on my left leg. I felt very comfortable and respected.

June 12, 2020 1:34 PM

I have already recommended Dr. Thomas to both family members and a friend who already has an appointment to see him.

June 5, 2020 12:00 AM

Dr. Thomas was very concerned and appropriately attending to dizziness that I experienced after a procedure he performed. He asked my primary for me, if she would see me right away. She said yes.

June 5, 2020 12:00 AM

Both of my drs. on this occasion made me feel that I was in excellent hands. I received excellent service and attention and care in this situation!

May 4, 2020 11:45 AM

Best doctor I ever had (period).

May 4, 2020 11:45 AM

Great group of healthcare providers from top to bottom.

April 22, 2020 9:37 AM


April 22, 2020 9:37 AM

Doctor was very pleasant. I thought he did a good job. Would recommend him to others.

April 6, 2020 2:58 PM

Dr. Thomas is one of the most courteous physicians I have ever been treated by. Dr. X is also very warm and professional. I have been very happy with my treatment since coming to the Oswego area.

March 28, 2020 7:05 AM

since this was a visit prompted by a health concern and during the coronavirus pandemic, I was nervous to go to the appt. However, everyone at the office made me feel safe and I was very happy I went in when I did. Dr. Thomas was able to assess my two concerns and make suggestions. I would go back to him again. And I appreciate the care and courtesy of all the staff and the quick response to my health issue.

March 28, 2020 7:05 AM

Overall, it was a good experience except for wearing the mask which I know was for the protection of others during this crisis.

March 24, 2020 9:34 AM

Always a good experience at Dr. Thomas' office!

March 16, 2020 2:39 PM

I was seen before my appointment time. My visit was thorough and efficient.

March 16, 2020 2:39 PM

Doctor did what I was there for, and explained what he was doing, and why.

March 13, 2020 8:34 AM

This was my 1st time I saw Dr. Thomas. Very impressed really liked him. Would recommend him to my family & friends.

March 12, 2020 10:05 AM

All of my doctor's are great!

March 11, 2020 9:48 PM

informative, respectful,

March 9, 2020 5:29 PM

thoroughly explained causal factors and how to avoid skin cancers in the future.

March 9, 2020 5:29 PM

very pleased with the doctor, receptionist, and nurse

February 29, 2020 6:54 AM

Dr. Thomas is the nicest and best dermatologist. I would definitely recommend him to anyone.

February 24, 2020 11:17 PM


February 24, 2020 11:17 PM

Things were done that helped me.

February 21, 2020 5:46 AM

Great experience!

February 19, 2020 8:11 PM

Dr. Thomas was so kind and understanding. I have seen him in the past and so do my family members and we will continue to do so as he is an excellent doctor and very kind and knowledgeable.

February 19, 2020 8:11 PM

From the moment I walked in for my appointment, I was treated with courtesy and in such a timely manner.

February 18, 2020 8:35 AM

He was the best doctor I have seen in YEARS! Truly restored my faith in the medical profession. I felt he cared about me and my ailments. Fantastic support staff as well. Highly recommend.

February 17, 2020 4:15 PM

dr. Thomas is very nice and easy to talk to..

February 17, 2020 3:48 PM

He was very helpful and he listened to me.

February 17, 2020 3:48 PM

Doctor was so helpful and was very concerned. I was glad that he suggested a follow up visit to make sure I was doing well.

February 17, 2020 7:06 AM

The staff was very friendly & I felt very comfortable to have the procedure done that day. Would highly recommend.

February 13, 2020 11:53 AM

Every thing was fine!

February 11, 2020 11:46 AM

Answers all questions

February 11, 2020 11:46 AM

Good experience. Makes me feel relaxed

February 11, 2020 2:28 AM

My son and I both had appointments with Dr. Thomas, and we both agree that Dr. Thomas is the best doctor we have seen thus far, in terms of communication, listening, interpersonal skills, and ensuring we feel like our thoughts matter in regards to our healthcare plan. We wish all our doctors would be like Dr. Thomas.

February 11, 2020 2:28 AM

See above. He is excellent. A+ manner with patients. A+ listening skills and communication skills. Completely positive experience. We are confident in his abilities.

February 10, 2020 2:46 PM

dr Thomas was friendly, prompt and professional he treated my wart and told me to call in 2 weeks with a follow up

February 10, 2020 2:32 PM

Very nice, was running a little behind schedule but was apologetic and gave me his full attention. Did not feel rushed.

February 10, 2020 1:43 PM

He was very good and listened to all I had to say. I felt way more confident in him than the physician's assistant I had seen previously.

February 4, 2020 7:49 AM

He took the time to discuss my options and the results that might come back and what would be needed if the results of the test were bad news.

February 4, 2020 7:49 AM

He was kind and courteous, taking time to as and answer any questions that I had. Great job and skill.

February 2, 2020 12:05 PM

Dr Thomas is the best!

January 29, 2020 5:17 PM

Dr. Thomas was most receptive to my comments about treatment procedures, which I truly appreciate.

January 27, 2020 2:49 PM

I like Dr. Thomas and hope to continue seeing him.

January 27, 2020 2:02 PM

Dr. Thomas is such a great Doctor I would not see anyone else for Dermatology.. He is so caring an always makes sure he understands my concerns an in return that I understand his thoughts or recommendations!

January 27, 2020 2:02 PM

Always Great experience with Dr. Thomas

January 26, 2020 2:25 PM

I have seen Dr B Thomas for a couple of things. He is very kind and always listens to what I have to say. Great Doctor!!

January 21, 2020 2:29 PM

Dr. Thomas is excellent. An amazing doctor.

January 20, 2020 5:03 PM

Dr. Dunne is a very pleasant Dr. with very good personality and ways of making you feel positive. Dr. Thomas lacks her "bedside manner" but seems like a good doctor.

January 20, 2020 5:47 AM

Dr. Thomas is wonderful! Very thorough.

January 19, 2020 8:36 AM

keep up the great work!

January 13, 2020 6:14 PM

Dr. Thomas continues to be a knowledgeable and excellent healthcare provider. I remain grateful for his attitude and expertise!

January 13, 2020 1:31 PM

Good visit

December 28, 2019 1:36 PM

very great experience

December 28, 2019 1:36 PM

very professional and helpful. extremely efficient and timely

December 21, 2019 9:59 AM

Have more doctors like him.

December 16, 2019 8:45 PM


December 13, 2019 11:43 PM

Dr. Thomas is the best dermatologist I've ever seen, and I've been seeing dermatologists for about 30 years.

December 13, 2019 11:43 PM

Dr. Thomas is willing to listen to me about things that work and things that don't help. He always will help and work with me.

December 13, 2019 11:00 PM

Dr. Thomas is great!!

December 9, 2019 2:46 PM

excellent treatment of skin condition and annual checkup

November 30, 2019 1:57 PM

I have already recommended Dr. Thomas to a friend and a relative.

November 30, 2019 1:57 PM

Excellent visit

November 23, 2019 3:04 PM

I enjoy my visits with Dr. Thomas.

November 19, 2019 3:55 PM

Dr. Thomas is remarkable

November 19, 2019 3:55 PM

He will always be my Dermatologist

November 18, 2019 8:24 PM

Thoroughly satisfied with all aspects of this appointment.

November 18, 2019 8:24 PM

Saw the doctor at scheduled time. Thoroughly explained medical condition and treatment that was available.

November 17, 2019 11:00 PM

professional and listens

November 17, 2019 11:00 PM

great, kind person

November 15, 2019 12:37 PM

I really like Dr. Thomas. He is very considerate of how I handle the treatment he performs during my visit.

November 12, 2019 11:00 PM

Dr. Thomas was excellent! All my questions and concerns were addressed

November 12, 2019 11:57 AM

Dr. Thomas was efficient and knowledgeable. He took the appropriate amount of time to discuss my health concerns, answered all my questions, and was clear on follow-up care and how to reach him/nurse/staff post visit. Staff was also very efficient but thorough and clearly described next steps and how I would be notified of test results.

November 12, 2019 11:57 AM

All my visits with Advocate doctors have been excellent. My only suggestion is for annual check-ups to increase the scheduled time with the doctor so that both patient and doctor are not "rushed" or resulting in delays for the next patient. Adequate time for an annual check-up is 45 minutes.

November 10, 2019 11:00 PM

Excellent visit, Dr Thomas was candid, listened well and spent good amount of time with me.

November 10, 2019 11:00 PM

Very positive visit.

November 10, 2019 11:00 PM

excellent visit

November 8, 2019 11:55 PM

Dr Thomas is always so kind and respectful as well as warm and friendly! He also always shows me on the computer pics of what condition I'm dealing with and prints out info for me to have. I have total confidence in his abilities and opinion and always have a positive experience! Seems like such a wonderful person and excellent doctor!!

November 7, 2019 12:41 PM

Dr. Thomas was very knowledgeable and went above and beyond to explain in detail what my skin issue was. Also, a very kind person who made me feel welcomed.

November 7, 2019 12:41 PM

I have gone to see him before but for my son a few years ago and he has not changed, he is still very kind, professional and knowledgeable.

October 31, 2019 7:00 PM

Thank you Dr Thomas for exceptional care for my eczema

October 28, 2019 7:00 PM

A nice unit.

October 28, 2019 7:00 PM

Dr. Thomas is an excellent doctor! The nursing staff is great too! The receptionist could be a little friendlier.

October 28, 2019 7:00 PM


October 27, 2019 7:00 PM

was prompt and quick to diagnose

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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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