Daniel O. Herzig M.D., F.A.C.S., F.A.S.C.R.S.

Photo of Daniel O. Herzig, M.D., F.A.C.S., F.A.S.C.R.S.
Faculty profile
  • Associate professor of surgery

Associate Professor of Surgery, Division of Gastrointestinal and General Surgery School of Medicine

Accepting new patients

4.9 out of 5 (391 Ratings, 119 Comments)


  • Cancer
  • Digestive Health
  • Surgery

Special focus on

  • Anal Cancer
  • Colorectal Cancer
  • Digestive Surgery
  • Gastrointestinal Cancer
  • General Surgery


  • M.D., Vanderbilt University School of Medicine, Nashville Tennessee 1999
  • Residency:

    • General Surgery, Brown University/Rhode Island Hospital, Providence, RI  1999-2004
  • Fellowship:

    • Colorectal Surgery, University of Texas Health Science Center at Houston, Houston, TX, 2004-2005
  • Certifications:

    • American Board of Surgery, 2005
    • Colon and Rectal Surgery, 2006


Dr. Herzig specializes in the surgical treatment of colon and rectal diseases. He earned his medical degree from Vanderbilt University and completed his surgical residency at Brown Medical School. At Brown, he won over a dozen awards for excellence in teaching, patient care, and research, including the Outstanding Resident Physician award in his last year. He went on to complete advanced training in colon and rectal surgery, including minimally invasive surgery and endoscopy at the University of Texas, Houston. Dr. Herzig is board certified in surgery and colon and rectal surgery.

Dr. Herzig joined the faculty at OHSU in 2005. He is part of the OHSU Digestive Health Center and the OHSU Knight Cancer Institute. He specializes in the treatment of both cancerous and noncancerous diseases of the colon and rectum. Dr. Herzig is committed to providing the highest quality personal service to each individual. Because of this, he has been recognized as one of “Portland’s Top Doctors" and has been named as one of "America’s Top Surgeons.”

Cancerous diseases include colon, rectal, and anal cancer. These are potentially curable cancers for many, if not most people who are affected. Individualized care is provided for each person. Whether as an initial visit, or as a second opinion after seeing another provider, Dr. Herzig will make sure each person understands their disease and all treatment options. While surgery remains the cornerstone of curing colorectal cancer, colorectal cancer care at OHSU comes from a team of people to address the complex nature of this problem, including of some of the country’s best physicians in this field. In our multidisciplinary clinic, we bring together all of the experts needed in one place at one time. Patients can see their surgeon, as well as an oncologist, nutritionist, geneticist, or radiation specialist all in one visit. Care is coordinated so that each individual receives the optimal, state-of-the-art approach. Clinical trials are available, if desired, for many patients with colorectal cancer.

Noncancerous (benign) diseases include the treatment of hemorrhoids, anal fissures, anal fistulae, diverticulitis, and rectal prolapse. In the treatment of benign diseases, Dr. Herzig treats each patient individually, working together to find the appropriate treatment for each person’s symptoms. This can often be done with non-operative and office treatments.

Dr. Herzig’s research interests include colorectal surgery outcomes and hereditary colorectal cancer syndromes. He started the state’s first colorectal cancer registry and has collaborated with other researchers at OHSU to continue this institution’s leadership in colorectal cancer research.

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  • English

Memberships and associations

  • Fellow, American College of Surgeons

Clinical Trials

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Patient Ratings

4.9 out of 5 (391 Ratings, 119 Comments)

The patient ratings score is an average of all responses to the question "How likely would you be to recommend this provider to your family and friends (on a scale of 0 to 10)" on our nationally-recognized NRC patient surveys.

Patient Comments

  • Feb 17, 2019

    Dr. Herzig is a professional who provides accurate assessments on health conditions. He is kind and is a good listener.

  • Feb 16, 2019

    Dr. Herzig listens well and communicates clearly. He is personable and extremely professional. I can’t imagine being in better hands.

  • Feb 16, 2019

    Have been patient of Dr Herzig for 5 years. Think he has given good advice about treatment options. Always explains in a way I can understand.

  • Feb 07, 2019

    I am very happy with Dr. Herzig. My surgery went very well. I recovered very quickly is a wonderful doctor to work with very compassionate and understanding I would recommend him to anyone. Thank you.

  • Feb 05, 2019

    I have been to Dr. Herzig before and have recommended him to a sister. My only complaints are how long one has to wait to get an appointment, having appointments changes, and waiting a long time at the clinic to be called in. Otherwise---I like Dr. Herzig very much and will continue to try to get appointments with him.

  • Feb 02, 2019

    Well I'm very satisfied, he's answered my question. I feel extremely comfortable with him doing my surgery. So yes.

  • Feb 01, 2019

    Excellent communicator. Great explanation of a complicate subject. Compassionate and thorough.

  • Feb 01, 2019

    Dr. Herzig is one of my very very favorite physicians that I've ever had. And I've had a few. He's got a wonderful bed side manner. His ability with patients is just Superior To None, his teaching with patients or, or... young physicians in the room is outstanding. I refer him to not only my family but anyone else

  • Jan 31, 2019

    Easy to talk to. Very informative. Very polite.

  • Jan 25, 2019

    This is [Name] and I would like to let somebody know that my provider Dr. Herzig was the best doctor I've ever had in my 72 years of life and he saved my life and I would recommend him to anybody he gets a perfect 10 for me.

  • Jan 25, 2019

    I'm thankful that Daniel Herzig listens to his paitents and take the time to answer questions.

  • Jan 24, 2019

    Dr Herzig is kind and professional. He is the best colon doctor! I would recommend him to without question.

  • Jan 21, 2019

    Personable on top of the game. Goes out of his way to work with my schedule since I drive from 2 hours away

  • Jan 20, 2019

    Dr. Herzig seemed thorough & knowledgable. I felt comfortable with both him & his colleague.

  • Jan 20, 2019

    He was very very good about explaining the cancer I had, and how the surgery would go, introduced the people assisting him, and talked slow. It was great.

  • Jan 17, 2019

    I know he is well educated, but he seems to not really listen to his patients. there is no way to interrupt his scheduled plans at all.

  • Jan 15, 2019

    Dr Herzig is always professional, thourough and proactive in my health care.

  • Jan 12, 2019

    The provider that I see on a yearly basis is always pleasant, explains things thoroughly, answers all questions to my satisfaction, and spends whatever time is needed.

  • Jan 12, 2019

    Dr. Herzig is very Friendly and nice. He is the best doctor I have ever visited. I would definitely recommend Dr. Herzig

  • Jan 12, 2019

    I have been a patient of Dr. Herzig's since 2015. He is extremely knowledgeable about his field of work, always up to date with what is new, always has time for me as a patient & is able to communicate with me perfectly. I honestly can't say enough excellent things about him and I feel so grateful to be his patient. As far as the specific procedure I had done on January 10th, that appointment was excellent.

  • Jan 11, 2019

    Daniel Herzig is very professional and I would recommend him to anybody.

  • Jan 10, 2019

    Dr. Herzig is great to talk to. I feel he respects me and talks to me instead of talking at me. He is pleasant and friendly. I also felt the nurse who took my vitals was also very pleasant and respectful.

  • Jan 08, 2019

    Dr. Herzig was kind, thorough, and clear. He helped guide me to the resources to decide on the next steps. I will always be grateful for his wonderful care.

  • Dec 29, 2018

    Excellent job.

  • Dec 29, 2018

    Dr. Herzig take with very patient, answered all my questions, gave me a lot of options, friendly, responsive, has a great sense of humor and is very very good at what he does. I would recommend him highly.

  • Dec 23, 2018

    Dr. Herzig provides the best care I could ask for, especially during this process of recuperation from 2 surgeries. I truly believe he is not just a colon-rectal surgeon, but a colon-rectal cosmetic surgeon, because of the good results of both surgeries he performed. I know that as I continue to need care to rid of a seroma (a normal tissue healing process), he will do his best towards my care and total recovery.

  • Dec 21, 2018

    Yes, I found the doctor to be very knowledgeable and personable, and he didn't make me feel rushed, and explained all of the options and what he thought about each one, and responded to my questions, and still gave me time to make a decision. I found it to be a very equitable situation.

  • Dec 13, 2018

    I really like the all the staff treats the patient.

  • Dec 13, 2018

    Things went good after found the hospital.

  • Dec 12, 2018

    Dr. Herzig was very informative, gave me all my choices, let me decide, gave me the pros and cons, very personable, very easy to talk with, trust him fully. I would recommend him to anyone.

  • Dec 10, 2018

    Dr Herzig is very familiar with my medical condition(s). As my care physician he has always provided me with great medical attention. He has always been forthright with sharing with me any information related to my current medical needs and always offers me alternative treatments that might be available. He has many resources available via the computer related to my past examinations and will share them with me as a better explanation while we are discussing current medical needs. Dr. Herzig is very professional and has a very personable demeanor during my visits to OHSU and that is always helpful while I am making decisions related to any recommendations he has related to my ongoing care. He is a wonderful physician and a wonderful caring person. I am so glad and pleased to have Dr. Herzig as my Care Physician

  • Dec 08, 2018

    Very helpful

  • Dec 08, 2018

    I feel confident that Dr. Herzig will take care of me. And hopefully I will be cancer free again. Anyway, thank you.

  • Dec 06, 2018

    The doctor was just really nice and personable. He... he was great. That's all I have to say.

  • Dec 05, 2018

    I felt very anxious nervous and Dr Herzig immediately made feel safe and comfortable. Dr Herzig bedside manner needs to be cloned to all other doctors! He explained every detail of what he was doing during my procedure and you could tell he genuinely cares about you and your well being.

  • Dec 05, 2018

    I've been seeing Daniel Herzig it for a little more than 5 years, I think at this point. He's been since the cancer surgery to remove the tumor until this check up this last time. It's been a good experience with, with him. We have a good, a good rapport and I would recommend them highly to anybody. He's thorough, he's got a good bed side manner, and I really like him. I feel like he's a good doctor, and very confident, and a good guy too, he's a good man. So yes, I have nothing but good things to say about him.

  • Nov 29, 2018

    On my visit with Dr. Herzig on 11.27.2018 was, as always, most attentive and kind. He answered all of my questions clearly and I never felt rushed.I truly feel that he cares.

  • Nov 29, 2018

    He was positive, and I appreciated his humor and respect he gave me.

  • Nov 29, 2018

    it was ok

  • Nov 28, 2018

    Everyone was kind, competent, and quick

  • Nov 18, 2018

    He is my favorite doctor all he always tells me what's wrong and how to fix it. I love you. That's all I can say. I don't need any more time to tell you how great he is. He the best I've seen so far. I look forward to seeing him. Okay. I guess I'm quicker than you are.

  • Nov 18, 2018

    Dr. Herzig is great, the most important thing to me that he's really knowledgeable about the condition he's working with me to prevent and avoid and he appears to be one of the most knowledgeable in the field, I appreciate that. I also appreciate his personality and you know, he's not overly, you know, he's he's professional but he obviously care and that's it shows in the care that he gives. Thanks.

  • Nov 18, 2018

    Dr. Herzig was very nice. He was listen to answered all of my questions. He made it possible for me to have a conversation alone with him. He answered my husband's questions. He was friendly he was Frank and I felt trusted like I trusted him and Safe in His Hands.

  • Nov 17, 2018

    Yes, Dr. Herzig is very good. He listens to his patients. He is very experienced in his field. I would have no problem recommending him to anyone.

  • Nov 15, 2018

    Dr. Herzig has been quite lovely and wonderful since I have been working with over a year ago. I felt bad for him because he had to give me potentially bad news on my last visit and I suspect that was not easy to do.

  • Nov 14, 2018

    I can depend in Dr. Herzig's experience and recommendations, and that was the case in this visit.

  • Nov 05, 2018

    Most people are very embarrassed about dealing with a colo-rectal problem. Dr Herzig had made it easy and comfortable about discussing my issues. We laugh a lot, too. I feel he has affection for me as a patient.

  • Nov 03, 2018

    A compassionate, knowledgable and professional doctor. Was thorough in his responses to my many questions and concerns. I only wish he were my local doctor!

  • Nov 02, 2018

    Hi. After my visit with Dan, I have to say that as a retired ICU nurse, I thought that Dan was very professional, very knowledgeable, and I would highly....and just personal. I would highly recommend him as a gastroenterologist, surgical or otherwise, for anybody.

  • Nov 01, 2018

    Dr Herzig cares for his patients, takes time with each and working toward the best for the patient health.

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