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 (350 Ratings, 94 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

The following clinical trials are currently accepting new participants:

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Patient Ratings

4.9 out of 5 (350 Ratings, 94 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

  • Dec 13, 2018

    I really like the all the staff treats the patient.

  • Dec 13, 2018

    Things went good after found the hospital.

  • 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.

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