For more information, call: 877-CENTEGRA

Amir J. Heydari, MD, FACS


Surgery, Bariatric
Surgery, General



American Board of Surgery


American Board of Surgery



University of Connecticut Hospital,


Univ. of Iowa Hospitals and Clinics


Univ. of Iowa Hospitals and Clinics

Dr. Amir Heydari is passionate in his belief that the disease of obesity and the alarming rise in individuals who are overweight demand the attention of the community, as well as the expertise of medical specialists to treat this serious health condition from both a surgical and non-surgical approach.

Dr. Heydari is a practicing board-certified, general, bariatric, oncologic and laparoscopic surgeon. He has held privileges for the last 13 years at Centegra Hospital – McHenry and Centegra Hospital – Woodstock. He has served in a variety of medical staff positions, including medical staff president and the Chairman of Department of Surgery.

Dr. Heydari has dedicated a great part of his practice to minimally invasive weight loss (bariatric) surgeries and care of overweight patients. He is committed to winning the battle against obesity. His desire and vision is to cater to the individual needs of any person who wishes to live a healthier life. Dr. Heydari specializes in general & bariatric surgery.

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Thank You Amir J. Heydari, MD, FACS

Megan Wangall says:

Dr. Heydari,

I have never seen a physician be so kind to the nurses and techs. He was so respectful. He was so down to earth and friendly.

Donna Dermont says:

Thank you Dr. Heydari for taking such great care of me and my daughter over the years. Your reputation for compassion and clinical expertise are legend. You Rock!

Carol Shanley says:

Our paths have crossed in the hall, but I have never officially thanked you for your fantastic care last year while my kidney was dying. I had called you because I had thought once again I was having a hernia problem but when you determined it was my kidney, you kept me under your personal care after admitting me. You brought me back to a stable enough position to transfer me up to Mayo where the doctors there actually just continued the treatment you had already started. They were quite impressed that a surgeon had taken care of my infusion needs. After many months of treatment, colon resection and kidney transplantation, I can now lead a normal life. There are not enough words to thank you so very much for saving my life. You are the BEST!

Mary Osborne says:

To say you changed my life is the understatement of the century! My entire life I was overweight and by my 30’s I had resigned myself to a life of obesity. It was all I ever knew and had tried so many times from early adolescence to adulthood to lose weight. All my attempts failed miserably. For years I said I would have a gastric bypass in a minute if the opportunity presented itself. Four months after working at Centegra I saw a flyer for the Bariatric informational meeting. It took some time but I talked myself into calling and reserving a spot. Though I always said I would have the surgery if I could, it was terrifying to think it might actually happen. After all, being obese was all I had ever known. You spoke at the informational meeting and I knew the second you finished speaking that I was going to have it done. I had complete faith in you and I was willing to put my life in your hands. You have been so kind, compassionate and encouraging. I am 9 months post op and have lost 125lbs. I am now living a life I never thought possible! For the first time in my adult life I actually feel like I am living life and not just existing. If it weren’t for your skill, your kindness and your dedication, I would have never had surgery. I will never be able to express enough gratitude for what you have done! Thank you Dr. Heydari!

Melissa Kizer-Denato says:

I LOVE YOU! You have given me a chance to live and enjoy life! You and your staff are absolutely wonderful!

Dana Wiley says:

Thank you so much to Dr. Heydari and staff for giving me my life back. I cannot believe how much my life has changed since having RnY earlier in the year 2013. You give me all the tool to be successful, and the post op support has been amazing. Thanks again. I am so proud to be a patient and a success story!

Vikki Gorski-Eicherl says:

Dr. Heydari and Staff,

I cannot begin to thank you enough for giving me the tools, education and support that has helped me to be the person I am today. I’m 11 months post-op (full bypass) and have lost over 125 lbs. I feel fantastic and would love nothing more that to be a part of your mission; motivating and encouraging those who are where I was at the beginning of my journey. A heartfelt thanks to you all for helping me to rediscover myself. You truely are a special group of people. :)

denise heisner says:

Thank you for all you do. And that includes your partners in your practice. Dr. Schwaab saw me oncall because I was having problems. He helped with the problem but I still will followup with you. I was so nervous and he was a pillar of calm. Your surgerical group totally rocks. Just wanted to let the world know that the centegra weight loss center totally rocks also. Thank you for giving me my life back. I am now down 150lbs, which is more than my original goal. Denise Heisner

Cheri Campbell says:

I would like to take a moment and thank Dr Heydari for every kind thing he has done for me. He is not only a skilled physician and surgeon but is also a wonderful, compassionate and genuine human being. It is rare to find a Dr. in this day and age who is so genuine and actually cares about what happens to people. I had 2 surgeries done by him. One was the gastric by pass and I have lost 110 pounds and feel great! I feel so blessed to have him as my Dr. I hope that if you are in need of a Dr that you see Dr Heydari. I’m positive you will be very happy.

Thank you Dr Heydari!!


Suzy says:

Thanks for always being available for questions for patients and staff! I am always confident when I assure the patients that their surgeon is the BEST! Happy Doctor’s Week!

Gloria Kessler says:

Dr. Heydari,

It’s been over four years and I am still in awe over the way my life has changed for the better since my surgery. You have given me the tools, care and support that I needed to make this journey possible. I know my success is due to your dedication to your practice. You show your patients every day how very much you care about us and there are not enough words to thank you!

denise heisner says:

Thank you Dr. Heydari for helping to give me the tools to regain control of my life. I am almost to my goal after 2 years . Thank you.

Phyllis says:

Not only are you an exemplary surgeon but you are a very kind and compassionate human being.

Thank you for saving my life.

Susie says:

Dear Dr. Heydari,

Thank you for taking such wonderful, skillful, and compassionate care of our patients at the Weight Loss Surgery Center. Being a part of the transformation of their lives to being healthier and happier is such a joy. I am proud to work side by side with you in our Center of Excellence.

A thinner Al Zemaitis says:

Dr. Heydari,

Thanks for working with me and making life better. Keep up all the Great work

K.S. says:

Thank you so much for giving me the tool to transform my life. Your support and resources are a great bonus to guarantee my success. The dedication and knowledge you have for the program is incredible. You are an angel in disguise to not only me but to the hundreds of other patients you have led down the road of a healthier, happier life. For that I am forever grateful.

You are the best

Anonymous says:

Thank you Doctor Heydari, for your wonderful and compassionate weight loss surgery program.

Anonymous says:

thank you dr. heydari for your wonderful care

Lisa Sullivan says:

Thank you for always being caring and compassionate. I have never felt rushed or like a nusiance if I had a question or concern. I feel blessed to have such an amazing doctor!

Kevin and Mary says:

Thank you Dr. Heydari! You are an amazing man who has given our family the amazing gife of LIFE! You should be so proud of your Center of Excellence in Weight Loss.

Patti Pawlisz says:

Dear Dr. Heydari,

I can’t thank you enough for giving me back my life in better condition than I was 6 months ago. You have given me a whole new life and outlook and now I am training for that Tri-Athlon with real vigor. I will never forget you and you will always be my favorite DOCTOR

Sue Frihart says:

No words can express how much your skill and compassion have changed my life. Thank you for giving me one that I can live the way I want through the weight loss surgery. You and your staff have been wonderful. Thank you.

Karen says:

Thank you for your genuine compassion and understanding. You are truly an outstanding physician/surgeon,and person. I have experienced this firsthand as a nurse in same day surgery, and as a patient. It takes a truly special person to posess such awesome skills both as a surgeon and as a person. Thanks for never making me feel like I was rushed, or that my questions were stupid.

Lisa O’Neil says:

Thanks for your genuine commitment to your patients and your profession. Everyone I refer to you has an outstanding outcome and makes a point to let me know how much they love being your patient.

Thanks also for your engagement in the NWH blog on your patients. We are very blessed at Centegra to have a physician of your caliber.

Joan & Jack says:

Hello from Amarillo, Texas. We are on our way to AZ to start our search for communities where we may like to end our journey that began with your surgeries. We have two scales packed, one for us and one for our food. We couldn’t let the week pass without thanking you for all that you have done to change our lives. We plan to move to AZ as two much healthier seniors, ready to find new adventures. You are amazing, your compassion as a person really enhance your excellent skills as a surgeon. We’d love to pack you up and take you with us a year from now. (Monica might not like that) I also wanted to share my latest good news! I did not have to pack my CPA. no more sleep apnea.

P.S. We are really saving money on food this trip…thanks again to a wonderful physician and person.

Gloria Kessler says:

Dr. Heydari, the words “Thank You” are not enough to show my appreciation for everything you have done to change my life. You are an extremely skilled tauma, general and bariactric surgeon. You have saved and touched many lives. For this we all thank you. You have shown great compasion for all of your patients and let us know that we are not just cared for, we are cared about. My life has truly changed for the good for having met you. Thanks for all you do!

Connie Castillo says:

I can’t say ever express enough how thankful I am that you helped me to get myself and my life back. I chose you for my bariatric surgery for many reasons. You are a very skilled and professional doctor, but aside from that, you are the most compassionate and caring doctor I have ever met. Not just for the surgery, either, but for years after, too. You take pride in what you do and you are genuine to the people you help. This shows when you talk about your work and the bariatric program. Thank you for being you.

Linda LIebmann says:

I can never thank you enough for helping me become on the outside the person I always knew I was on the inside. Its rare to find a doctor who has such a genuine connection with patients. I feel blessed to be under the care of you and your whole fabulous staff!

Lori Baldwin says:

Thanks for having patience with all my issues! You are an excellent doctor and I’m so glad to have met you.

Marla Watson Pfleger says:

Dr. Heydari,

There will never be enough words or time to properly thank you in the amount that I would like to. You have saved our family more than once. Thank you for saving my life and the life of my daddy more than once. You are a God send to me and I will always be grateful to having found you.

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